Abstract

With the emergence of high-repetition-rate few-cycle laser pulse amplifiers aimed at investigating ultrafast dynamics in atomic, molecular, and solid-state science, the need for ever faster carrier-envelope phase (CEP) detection and control has arisen. Here we demonstrate a high-speed, continuous, every-single-shot measurement and fast feedback scheme based on a stereo above-threshold ionization time-of-flight spectrometer capable of detecting the CEP and pulse duration at a repetition rate of up to 400 kHz. This scheme is applied to a 100 kHz optical parametric chirped pulse amplification few-cycle laser system, demonstrating improved CEP stabilization and allowing for CEP tagging.

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

In recent years, the investigation of ultrafast processes and, in particular, applications in attosecond science motivated the development of new types of coherent light sources, which are capable of delivering few-cycle pulses at high average power (up to 200 W) and high repetition rates (100kHz). These light sources are based either on optical parametric amplification (OPA) [16] or direct post-compression of laser pulses from high-repetition-rate laser amplifiers [7]. The high repetition rate is crucial in experimental techniques where the number of events per laser shot has to be kept small or even below one. Examples of this are the detection of charged particles in coincidence upon photoionization [8,9], or time-resolved photoelectron spectroscopy in solids [10]. Furthermore, ultrashort pulse duration, down to a few optical cycles, is highly attractive for the study and control of ultrafast processes in light-matter interaction. In particular, the few-cycle pulse duration allows for the production of isolated attosecond extreme ultraviolet (XUV) light pulses through high-harmonic generation (HHG). In order to confine the harmonic emission to a single XUV pulse, it is essential to precisely measure and control the carrier-envelope phase (CEP) of the ultrashort pulses. Thus, for the successful implementation of high-repetition-rate sources in attosecond science applications, the CEP of the pulses has to be determined and possibly controlled at high repetition rates exceeding 100 kHz.

Above-threshold ionization (ATI) of xenon is known to be an effective way for determining the CEP of few-cycle pulses [1113]. Thus, it has also been utilized for CEP tagging, which allows for the investigation of CEP dependencies in ultrafast processes by tagging the events of interest with the CEP of the laser pulse inducing them [1416]. To this end, a stereo-ATI CEP meter (CEPM) and adjacent electronics have been developed over the last years, proving control over the CEP up to 10 kHz [17]. The newly developed electronics can calculate the CEP within 300ns after the laser pulse to measure the CEP of a 100 kHz optical parametric chirped pulse amplification (OPCPA) laser system [4]. This not only enables continuous every-single-shot measurements up to several hundreds of kilohertz repetition rate, but also facilitates improved CEP stability and CEP tagging.

The concept is illustrated in Figs. 1 and 2. Two time-of-flight (TOF) spectrometers with micro-channel plates (left and right in Fig. 1) face each other along the direction of the laser polarization. Given the few-cycle duration of the pulse, there is a difference between the ATI spectra recorded by the two TOF spectrometers (labelled left and right), and this difference is highly sensitive to the value of the CEP. The left-right asymmetry of the ATI electron spectra is evaluated from two energy regions in the plateau of rescattered electrons, as shown in the lower part of Fig. 1 [11]. From the asymmetry values of many laser shots, a parametric asymmetry plot can be constructed, see Fig. 3. Here the asymmetry of the high-kinetic-energy part of the spectrum of each shot is plotted on the x-axis and that of the low-kinetic-energy part is plotted on the y-axis. Each individual laser shot is measured and plotted as a single data point, with its CEP encoded in the polar angle of the circle. Additionally, the pulse duration is encoded in the radius [18], i.e., the shorter the pulse, the larger the asymmetry and the larger the radius.

 

Fig. 1. Schematic of the stereo-ATI apparatus. Two TOF spectrometers located on opposite sides along the laser polarization (left/right) measure electron spectra of Xe ionized by few-cycle laser pulses. The asymmetry (A) in the number of photoelectrons on the left (L) and right (R) detectors, A=(LR)/(L+R), is calculated in two regions in the plateau of the ATI spectra (low/high, bottom panel). From this, the value of the CEP can be retrieved; see Refs. [11,12,16,18].

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Fig. 2. Feedback schematics. The oscillator seeds the OPCPA, and the amplified pulses are then measured by the CEPM from which a feedback signal can be generated and sent to a modulation input in the phase-locking system of the oscillator for CEP stabilization up to a bandwidth of 300 kHz. Details about the setup can be found for the oscillator in [19], OPCPA in [4], and CEPM in [12].

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Fig. 3. Parametric asymmetry plot with 100,000 individual and consecutive laser shots acquired during 1 s without (blue) and with (green) active CEP stabilization. The CEP is encoded in the polar angle Θ of the circular shape and the pulse duration in the radius r; for a detailed description, see Refs. [11,12,18]. In this example, the average radius corresponds to a pulse duration of 3.5 fs, and the individual CEP determinations have an uncertainty of 82 mrad or 35 as, estimated from the radius distribution Δr.

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For the measurement, we use the scheme depicted in Fig. 2. A carrier-envelope offset (CEO) frequency-stabilized few-cycle laser oscillator is seeding the OPCPA [4,19]. The oscillator operates at a repetition rate of 80 MHz, and the CEO frequency is locked to 1/4 of the repetition rate. As a consequence, the CEP slip from pulse-to-pulse in the pulse train from the oscillator is π/2, and the amplified pulses at 100 kHz should ideally carry the same value of CEP. Thus, for the sake of brevity, we will refer to the oscillator as CEP-stable when it is operated with a locked CEO frequency. A small DC offset to the feedback loop controlling the CEO frequency of the oscillator (modulation input in the locking electronics box) is utilized to correct drifts in the CEP of the amplified pulses. After amplification and compression, 7 fs, 800 nm, 190 μJ pulses are produced at a repetition rate of 100 kHz. The amplified pulse spectrum was further broadened in a differentially pumped hollow-core fiber (HCF) backed with 2.6 bars of neon gas on the exit side, and the pulses were recompressed with chirped mirrors and thin fused-silica wedges to an approximate duration of 3.5±0.5fs with a pulse energy of 90μJ [20]. The pulse duration has been independently confirmed using SEA-F-SPIDER [21].

A fraction of the pulse energy (30μJ) was split off the train, and the CEP of the 1.3 cycle pulses was sampled with the stereo-ATI at a rate of 100 kHz. Additional optimization to further reduce the pulse energy requirements to the 10 μJ level is also being explored. The ATI-signal can be evaluated in real time, i.e., within 300 ns and well before the next pulse arrives, and utilized to feed back to the modulation input in the locking electronics for compensation of “slow” CEP drifts in the laser system. Collecting the relevant high-energy portion of the ATI spectrum takes roughly 100 ns, which corresponds to a maximum theoretical acquisition rate of 10 MHz. In addition, the CEP of the amplified pulses was characterized in parallel utilizing an f-2f interferometer [22]. In this case, each phase value retrieved integrates 100 shots, and the detection bandwidth is limited to 200 Hz by the spectrometer utilized. These f-2f phase values can alternatively be used to generate a correction signal for feeding back to the locking electronics in the oscillator and compensate for the slow CEP drifts. In this case, the stereo-ATI can be utilized to perform an out-of-loop measurement.

Figure 3 shows a parametric asymmetry plot taken with the 100 kHz laser system. When the oscillator is not CEP-stabilized, i.e., for a randomly varying CEP, the plot approaches a circle (blue). When the CEP stabilization is switched on, only a section corresponding to a limited range of CEP values remains (green).

The performance of the laser system is further characterized in Fig. 4, which shows the retrieved CEP values as a function of time under different conditions. Figures 4(a) and 4(b) show the CEP of the amplified pulses when the OPCPA is seeded with CEP-stable pulses from the oscillator, but no additional feedback is implemented (open loop). Given the large number of data points, the CEP values in Fig. 4(b) have been arranged in a two-dimensional histogram in the form of a density plot for better visualization. Figure 4(a), on the other hand, shows the CEP values over the first 200 μs in order to highlight the capability of characterizing the CEP of the system on a pulse-to-pulse basis. This clearly demonstrates that the CEP stability of the oscillator is retained in the OPCPA process and mainly low-frequency noise remains to be corrected. Figure 4(c) shows a histogram of the CEP values over the entire series. In this open-loop case, the standard deviation (SD) of the CEP noise over 20 s, i.e., 2×106 shots, is 399 mrad. Panels (d)–(f) show similar plots for the case when the stereo-ATI CEP feedback is active (closed loop). In this case, the SD reduces to 252 mrad, and the overall drift is minimized. However, from Fig. 4(d), highlighting individual CEP measurements on a short time scale, it can be observed that the feedback from the stereo-ATI increases slightly the shot-to-shot variations of the CEP. Finally, Figs. 4(g)4(i) show similar results for the case when the signal from the f-2f interferometer is utilized to implement a closed loop, and the CEP is characterized out-of-loop with the stereo-ATI. In this case, the residual CEP noise amounts to 297 mrad over 20 s. On short time scales, the CEP noise does not vary significantly, as in the open-loop case, but the variation of the CEP over longer time scales is slightly larger in this case in comparison with Fig. 4(e).

 

Fig. 4. Evaluation of three CEP-traces. (a)–(c) Top row with active oscillator CEP stabilization only (open loop); (d)–(f) middle row with stereo-ATI CEP feedback on the oscillator; and (g)–(i) bottom row f-2f CEP feedback. The left column shows the short-term trace over 200 μs, and the middle column density plots over 20 s/2M shots with its histogram in the right column. For the oscillator-stable-only case, the SD over the 2M shots amounts to 399 mrad. While also including the stereo-ATI feedback, it is reduced to 252 mrad; a trace with the f-2f feedback yields 297 mrad.

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The residual CEP noise values shown in Figs. 4(c), 4(f), and 4(i) result from the convolution of the residual CEP noise with the response of the CEPM. Assuming Gaussian shapes for both, the CEPM response (80mrad) and the CEP noise, the SD excluding CEPM uncertainty for the closed-loop measurements are 235 mrad for the case of the stereo-ATI feedback and 284 mrad for the f-2f case. Both results are comparable to values published for typical Ti:sapphire amplifier systems [2325] and comply with the demand of attosecond science experiments, although not yet reaching the limit imposed by the residual CEP noise in the oscillator (150mrad). The additional CEP noise in the amplified pulses may have multiple sources, such as pulse-to-pulse intensity variations in the pump laser of the OPCPA, residual jitter in the pump-seed delay of the OPCPA, and beam pointing instabilities affecting the amplification process and the broadening in the HCF [2628].

What needs to be emphasized here is that single-shot CEP values measured at the full repetition rate are the basis for the statistics. Single-shot detection of interference fringes from f-2f interferometers utilizing two fast detectors has been proposed for characterization and control of high-repetition-rate systems and demonstrated for repetition rates up to 10 kHz [23,29]. However, so far, the analysis of the CEP residual noise from high-repetition-rate systems was limited to the measurement of quantities averaged over 10–100s of laser shots. Thus, the averaged noise values are always significantly smaller than the values of single-shot-based statistics [14]. An exception to this averaging are the results published by Thiré et al. [6] where a fast detector is utilized to measure single-shot interferograms at 10 kHz out of a 100 kHz pulse train. However, undersampling the pulse train can also underestimate the CEP noise, as the observed increasing high-frequency noise cannot be captured.

In contrast, thanks to the fast acquisition rate of the stereo-ATI apparatus, it is possible to retrieve the CEP of all the pulses in the 100 kHz train. If these single-shot CEP values are averaged in groups of 100 shots, as the f-2f measurement does, one obtains an SD of just 133 mrad over 10 s for the stereo-ATI feedback stabilized case in Fig. 4(e). This explains and corresponds well to the lower value obtained with an f-2f interferometer integrating 100 shots [4]. However, these levels of single-shot CEP noise are well suited to perform CEP-sensitive experiments that rely on individual attosecond pulses [17].

Detecting the CEP of the 100 kHz pulse train on a single-shot basis, Fig. 4, allows for a frequency-resolved noise analysis of the laser system, which is shown in Fig. 5. It can be seen that for this OPCPA system, the majority of the noise remaining after locking the oscillator (black) lies below 1 kHz and, therefore, a relatively slow feedback loop is sufficient to control most of the CEP noise of the amplified pulses. The feedback loop utilizing the stereo-ATI signal reduces the phase noise by several orders of magnitude for low frequencies and liess well below the open loop result over the whole spectrum, as can be seen by comparing both traces in Fig. 5(a). A few well-defined noise peaks and their harmonics are highlighted in Fig. 5(a). Most of them correspond to acoustic noise in the laboratory. Note that between 20 and 30 kHz the feedback from the stereo-ATI introduces additional noise, which is also seen in the CEP as a function of time at short time scales [Fig. 4(d)]. Further investigations are necessary to identify the source of this additional noise.

 

Fig. 5. Power spectral density from a Fourier analysis of 1 M consecutive laser shots. Panel (a) shows a comparison of the open loop (oscillator CEP-locked only, black) and closed stereo-ATI feedback loop (red). The main noise components are denoted. The feedback with the stereo-ATI signal reduces the noise significantly over the full spectral range, except for a region near 25 kHz. Panel (b) shows a comparison of the f-2f feedback (black) and the stereo-ATI feedback (red).

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Figure 5(b) shows a comparison of the frequency-resolved phase noise of the system in a closed-loop mode for the case of locking with the stereo-ATI signal (red) and the f-2f interferometer signal (black). The frequency analysis shows an improvement over almost the full spectral range when the stereo-ATI is utilized. Particularly in the range from about 1 to 4 kHz the noise present with the f-2f-feedback is suppressed. It is worth noticing that the data corresponding to the locking with the stereo-ATI signal is an in-loop measurement, while the f-2f locking case is measured out-of-loop. Nevertheless, these proof-of-principle results show the potential for the stereo-ATI to control the system at frequencies well over 10 kHz. Future improvements to the PID feedback controls should allow for further reduction in noise, while better measurement precision will lower the noise floor. In addition, the results show that the OPCPA system analyzed is well suited for performing CEP-sensitive experiments.

In conclusion, we have demonstrated the capability to measure and control the CEP of few-cycle laser pulses at repetition rates of 100 kHz. This allowed us to characterize for the first time, to the best of our knowledge, the residual CEP noise from a high-repetition-rate OPCPA on a single-shot basis at the full repetition rate. This setup also enables the investigation of CEP dependencies in ultrafast processes through the phase-tagging approach and facilitates highly efficient control of the CEP for steering processes such as HHG driven by few-cycle laser pulses and, in particular, the generation of isolated attosecond XUV pulses. Due to the fast CEP evaluation (300ns), the technique also allows for measurement and control of even higher repetition rate lasers up to 400 kHz. Combined with the continuing progress in laser development [17,30,31], these features promise exciting developments in attosecond science.

Funding

Horizon 2020 Framework Programme (H2020) (654148, 674960); Deutsche Forschungsgemeinschaft (DFG) (PA 730/7, SPP-1840).

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5. U. Elu, M. Baudisch, H. Pires, F. Tani, M. H. Frosz, F. Köttig, A. Ermolov, P. S. J. Russell, and J. Biegert, Optica 4, 1024 (2017). [CrossRef]  

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References

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  1. J. Rothhardt, S. Demmler, S. Hädrich, J. Limpert, and A. Tünnermann, Opt. Express 20, 10870 (2012).
    [Crossref]
  2. S. Prinz, M. Haefner, C. Y. Teisset, R. Bessing, K. Michel, Y. Lee, X. T. Geng, S. Kim, D. E. Kim, T. Metzger, and M. Schultze, Opt. Express 23, 1388 (2015).
    [Crossref]
  3. J. Matyschok, T. Lang, T. Binhammer, O. Prochnow, S. Rausch, M. Schultze, A. Harth, P. Rudawski, C. L. Arnold, A. L’Huillier, and U. Morgner, Opt. Express 21, 29656 (2013).
    [Crossref]
  4. F. J. Furch, T. Witting, A. Giree, C. Luan, F. Schell, G. Arisholm, C. P. Schulz, and M. J. J. Vrakking, Opt. Lett. 42, 2495 (2017).
    [Crossref]
  5. U. Elu, M. Baudisch, H. Pires, F. Tani, M. H. Frosz, F. Köttig, A. Ermolov, P. S. J. Russell, and J. Biegert, Optica 4, 1024 (2017).
    [Crossref]
  6. N. Thiré, R. Maksimenka, B. Kiss, C. Ferchaud, P. Bizouard, E. Cormier, K. Osvay, and N. Forget, Opt. Express 25, 1505 (2017).
    [Crossref]
  7. S. Hädrich, M. Kienel, M. Müller, A. Klenke, J. Rothhardt, R. Klas, T. Gottschall, T. Eidam, A. Drozdy, P. Jójárt, Z. Várallyay, E. Cormier, K. Osvay, A. Tünnermann, and J. Limpert, Opt. Lett. 41, 4332 (2016).
    [Crossref]
  8. J. Ullrich, R. Moshammer, A. Dorn, R. Dörner, L. P. H. Schmidt, and H. Schmidt-Böcking, Rep. Prog. Phys. 66, 1463 (2003).
    [Crossref]
  9. J. Long, F. J. Furch, J. Durá, A. S. Tremsin, J. Vallerga, C. P. Schulz, A. Rouzée, and M. J. Vrakking, J. Chem. Phys. 147, 013919 (2017).
    [Crossref]
  10. M. I. Stockman, M. F. Kling, U. Kleineberg, and F. Krausz, Nat. Photonics 1, 539 (2007).
    [Crossref]
  11. T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus, and R. Kienberger, Nat. Phys. 5, 357 (2009).
    [Crossref]
  12. A. M. Sayler, T. Rathje, W. Müller, K. Rühle, R. Kienberger, and G. G. Paulus, Opt. Lett. 36, 1 (2011).
    [Crossref]
  13. T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
    [Crossref]
  14. N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
    [Crossref]
  15. A. M. Sayler, M. Arbeiter, S. Fasold, D. Adolph, M. Möller, D. Hoff, T. Rathje, B. Fetić, D. B. Milošević, T. Fennel, and G. G. Paulus, Opt. Lett. 40, 3137 (2015).
    [Crossref]
  16. D. Hoff, M. Krüger, L. Maisenbacher, A. Sayler, G. G. Paulus, and P. Hommelhoff, Nat. Phys. 13, 947 (2017).
    [Crossref]
  17. P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
    [Crossref]
  18. A. Sayler, T. Rathje, W. Müller, C. Kürbis, K. Rühle, G. Stibenz, and G. Paulus, Opt. Express 19, 4464 (2011).
    [Crossref]
  19. S. Rausch, T. Binhammer, A. Harth, E. Schulz, M. Siegel, and U. Morgner, Opt. Express 17, 20282 (2009).
    [Crossref]
  20. W. A. Okell, T. Witting, D. Fabris, D. Austin, M. Bocoum, F. Frank, A. Ricci, A. Jullien, D. Walke, J. P. Marangos, R. Lopez-Martens, and J. W. G. Tisch, Opt. Lett. 38, 3918 (2013).
    [Crossref]
  21. T. Witting, F. Frank, C. A. Arrell, W. A. Okell, J. P. Marangos, and J. W. G. Tisch, Opt. Lett. 36, 1680 (2011).
    [Crossref]
  22. M. Kakehata, H. Takada, Y. Kobayashi, K. Torizuka, Y. Fujihira, T. Homma, and H. Takahashi, Opt. Lett. 26, 1436 (2001).
    [Crossref]
  23. S. Koke, C. Grebing, B. Manschwetus, and G. Steinmeyer, Opt. Lett. 33, 2545 (2008).
    [Crossref]
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L. Lavenu, M. Natile, F. Guichard, Y. Zaouter, M. Hanna, E. Mottay, and P. Georges, Opt. Express 25, 7530 (2017).
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F. J. Furch, T. Witting, A. Giree, C. Luan, F. Schell, G. Arisholm, C. P. Schulz, and M. J. J. Vrakking, Opt. Lett. 42, 2495 (2017).
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D. Hoff, M. Krüger, L. Maisenbacher, A. Sayler, G. G. Paulus, and P. Hommelhoff, Nat. Phys. 13, 947 (2017).
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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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2016 (1)

2015 (3)

2014 (1)

2013 (3)

2012 (3)

2011 (5)

2009 (3)

2008 (1)

2007 (1)

M. I. Stockman, M. F. Kling, U. Kleineberg, and F. Krausz, Nat. Photonics 1, 539 (2007).
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2003 (1)

J. Ullrich, R. Moshammer, A. Dorn, R. Dörner, L. P. H. Schmidt, and H. Schmidt-Böcking, Rep. Prog. Phys. 66, 1463 (2003).
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Adolph, D.

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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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Anumula, S.

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Arisholm, G.

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Austin, D.

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Baudisch, M.

Ben-Itzhak, I.

N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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Betsch, K. J.

N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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Biegert, J.

Binhammer, T.

Bizouard, P.

Bocoum, M.

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Çankaya, H.

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Carpeggiani, P.

P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus, and R. Kienberger, Nat. Phys. 5, 357 (2009).
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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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Comte, M.

Cormier, E.

De, S.

N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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J. Ullrich, R. Moshammer, A. Dorn, R. Dörner, L. P. H. Schmidt, and H. Schmidt-Böcking, Rep. Prog. Phys. 66, 1463 (2003).
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J. Ullrich, R. Moshammer, A. Dorn, R. Dörner, L. P. H. Schmidt, and H. Schmidt-Böcking, Rep. Prog. Phys. 66, 1463 (2003).
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J. Long, F. J. Furch, J. Durá, A. S. Tremsin, J. Vallerga, C. P. Schulz, A. Rouzée, and M. J. Vrakking, J. Chem. Phys. 147, 013919 (2017).
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Frank, F.

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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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J. Long, F. J. Furch, J. Durá, A. S. Tremsin, J. Vallerga, C. P. Schulz, A. Rouzée, and M. J. Vrakking, J. Chem. Phys. 147, 013919 (2017).
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Georges, P.

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Gobert, O.

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Gu, X.

T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus, and R. Kienberger, Nat. Phys. 5, 357 (2009).
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T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus, and R. Kienberger, Nat. Phys. 5, 357 (2009).
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Herrwerth, O.

N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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D. Hoff, M. Krüger, L. Maisenbacher, A. Sayler, G. G. Paulus, and P. Hommelhoff, Nat. Phys. 13, 947 (2017).
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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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A. M. Sayler, M. Arbeiter, S. Fasold, D. Adolph, M. Möller, D. Hoff, T. Rathje, B. Fetić, D. B. Milošević, T. Fennel, and G. G. Paulus, Opt. Lett. 40, 3137 (2015).
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D. Hoff, M. Krüger, L. Maisenbacher, A. Sayler, G. G. Paulus, and P. Hommelhoff, Nat. Phys. 13, 947 (2017).
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T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus, and R. Kienberger, Nat. Phys. 5, 357 (2009).
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T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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Jójárt, P.

Jones, R. R.

N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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Jullien, A.

Kakehata, M.

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T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
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A. M. Sayler, T. Rathje, W. Müller, K. Rühle, R. Kienberger, and G. G. Paulus, Opt. Lett. 36, 1 (2011).
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Kienel, M.

Kim, D. E.

Kim, S.

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M. I. Stockman, M. F. Kling, U. Kleineberg, and F. Krausz, Nat. Photonics 1, 539 (2007).
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Kling, M. F.

T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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M. I. Stockman, M. F. Kling, U. Kleineberg, and F. Krausz, Nat. Photonics 1, 539 (2007).
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Koke, S.

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M. I. Stockman, M. F. Kling, U. Kleineberg, and F. Krausz, Nat. Photonics 1, 539 (2007).
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D. Hoff, M. Krüger, L. Maisenbacher, A. Sayler, G. G. Paulus, and P. Hommelhoff, Nat. Phys. 13, 947 (2017).
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Kübel, M.

T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
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Kühn, S.

P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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Kürbis, C.

L’Huillier, A.

Lang, T.

Lavenu, L.

Lee, Y.

Lezius, M.

N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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Long, J.

J. Long, F. J. Furch, J. Durá, A. S. Tremsin, J. Vallerga, C. P. Schulz, A. Rouzée, and M. J. Vrakking, J. Chem. Phys. 147, 013919 (2017).
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Lopez-Martens, R.

Luan, C.

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Mainz, R. E.

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D. Hoff, M. Krüger, L. Maisenbacher, A. Sayler, G. G. Paulus, and P. Hommelhoff, Nat. Phys. 13, 947 (2017).
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Maksimenka, R.

Manschwetus, B.

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Miloševic, D. B.

Möller, M.

A. M. Sayler, M. Arbeiter, S. Fasold, D. Adolph, M. Möller, D. Hoff, T. Rathje, B. Fetić, D. B. Milošević, T. Fennel, and G. G. Paulus, Opt. Lett. 40, 3137 (2015).
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T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
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Moshammer, R.

P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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Müller, M.

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A. M. Sayler, T. Rathje, W. Müller, K. Rühle, R. Kienberger, and G. G. Paulus, Opt. Lett. 36, 1 (2011).
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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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A. Sayler, T. Rathje, W. Müller, C. Kürbis, K. Rühle, G. Stibenz, and G. Paulus, Opt. Express 19, 4464 (2011).
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Nisoli, M.

Noack, F.

Okell, W. A.

Oksenhendler, T.

Osvay, K.

Paul, P.-M.

Paulus, G.

T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
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A. Sayler, T. Rathje, W. Müller, C. Kürbis, K. Rühle, G. Stibenz, and G. Paulus, Opt. Express 19, 4464 (2011).
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D. Hoff, M. Krüger, L. Maisenbacher, A. Sayler, G. G. Paulus, and P. Hommelhoff, Nat. Phys. 13, 947 (2017).
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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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A. M. Sayler, M. Arbeiter, S. Fasold, D. Adolph, M. Möller, D. Hoff, T. Rathje, B. Fetić, D. B. Milošević, T. Fennel, and G. G. Paulus, Opt. Lett. 40, 3137 (2015).
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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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A. M. Sayler, T. Rathje, W. Müller, K. Rühle, R. Kienberger, and G. G. Paulus, Opt. Lett. 36, 1 (2011).
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D. Adolph, A. M. Sayler, T. Rathje, K. Rühle, and G. G. Paulus, Opt. Lett. 36, 3639 (2011).
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T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus, and R. Kienberger, Nat. Phys. 5, 357 (2009).
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Petrov, V.

Pires, H.

Poletto, L.

P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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Prinz, S.

Prochnow, O.

Rathje, T.

A. M. Sayler, M. Arbeiter, S. Fasold, D. Adolph, M. Möller, D. Hoff, T. Rathje, B. Fetić, D. B. Milošević, T. Fennel, and G. G. Paulus, Opt. Lett. 40, 3137 (2015).
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T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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A. M. Sayler, T. Rathje, W. Müller, K. Rühle, R. Kienberger, and G. G. Paulus, Opt. Lett. 36, 1 (2011).
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A. Sayler, T. Rathje, W. Müller, C. Kürbis, K. Rühle, G. Stibenz, and G. Paulus, Opt. Express 19, 4464 (2011).
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D. Adolph, A. M. Sayler, T. Rathje, K. Rühle, and G. G. Paulus, Opt. Lett. 36, 3639 (2011).
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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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C. Feng, J.-F. Hergott, P.-M. Paul, X. Chen, O. Tcherbakoff, M. Comte, O. Gobert, M. Reduzzi, F. Calegari, C. Manzoni, M. Nisoli, and G. Sansone, Opt. Express 21, 25248 (2013).
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Ricci, A.

Rossi, G. M.

Rothhardt, J.

Rouzée, A.

J. Long, F. J. Furch, J. Durá, A. S. Tremsin, J. Vallerga, C. P. Schulz, A. Rouzée, and M. J. Vrakking, J. Chem. Phys. 147, 013919 (2017).
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D. Hoff, M. Krüger, L. Maisenbacher, A. Sayler, G. G. Paulus, and P. Hommelhoff, Nat. Phys. 13, 947 (2017).
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T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
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A. Sayler, T. Rathje, W. Müller, C. Kürbis, K. Rühle, G. Stibenz, and G. Paulus, Opt. Express 19, 4464 (2011).
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A. M. Sayler, M. Arbeiter, S. Fasold, D. Adolph, M. Möller, D. Hoff, T. Rathje, B. Fetić, D. B. Milošević, T. Fennel, and G. G. Paulus, Opt. Lett. 40, 3137 (2015).
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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus, and R. Kienberger, Nat. Phys. 5, 357 (2009).
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Schmidt, L. P. H.

J. Ullrich, R. Moshammer, A. Dorn, R. Dörner, L. P. H. Schmidt, and H. Schmidt-Böcking, Rep. Prog. Phys. 66, 1463 (2003).
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Schmidt-Böcking, H.

J. Ullrich, R. Moshammer, A. Dorn, R. Dörner, L. P. H. Schmidt, and H. Schmidt-Böcking, Rep. Prog. Phys. 66, 1463 (2003).
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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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Schulz, C. P.

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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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J. Long, F. J. Furch, J. Durá, A. S. Tremsin, J. Vallerga, C. P. Schulz, A. Rouzée, and M. J. Vrakking, J. Chem. Phys. 147, 013919 (2017).
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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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J. Long, F. J. Furch, J. Durá, A. S. Tremsin, J. Vallerga, C. P. Schulz, A. Rouzée, and M. J. Vrakking, J. Chem. Phys. 147, 013919 (2017).
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Vrakking, M. J.

J. Long, F. J. Furch, J. Durá, A. S. Tremsin, J. Vallerga, C. P. Schulz, A. Rouzée, and M. J. Vrakking, J. Chem. Phys. 147, 013919 (2017).
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Wang, L.

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N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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Wittmann, T.

T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus, and R. Kienberger, Nat. Phys. 5, 357 (2009).
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J. Chem. Phys. (1)

J. Long, F. J. Furch, J. Durá, A. S. Tremsin, J. Vallerga, C. P. Schulz, A. Rouzée, and M. J. Vrakking, J. Chem. Phys. 147, 013919 (2017).
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J. Phys. B (1)

T. Rathje, N. G. Johnson, M. Möller, F. Süßmann, D. Adolph, M. Kübel, R. Kienberger, M. F. Kling, G. Paulus, and A. Sayler, J. Phys. B 45, 074003 (2012).
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Nat. Photonics (2)

M. I. Stockman, M. F. Kling, U. Kleineberg, and F. Krausz, Nat. Photonics 1, 539 (2007).
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P. Carpeggiani, M. Reduzzi, A. Comby, H. Ahmadi, S. Kühn, F. Calegari, M. Nisoli, F. Frassetto, L. Poletto, D. Hoff, J. Ullrich, C. D. Schröter, R. Moshammer, G. G. Paulus, and G. Sansone, Nat. Photonics 11, 383 (2017).
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T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus, and R. Kienberger, Nat. Phys. 5, 357 (2009).
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Optica (1)

Phys. Rev. A (1)

N. G. Johnson, O. Herrwerth, A. Wirth, S. De, I. Ben-Itzhak, M. Lezius, B. Bergues, M. F. Kling, A. Senftleben, C. D. Schröter, R. Moshammer, J. Ullrich, K. J. Betsch, R. R. Jones, A. M. Sayler, T. Rathje, K. Rühle, W. Müller, and G. G. Paulus, Phys. Rev. A 83, 013412 (2011).
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Rep. Prog. Phys. (1)

J. Ullrich, R. Moshammer, A. Dorn, R. Dörner, L. P. H. Schmidt, and H. Schmidt-Böcking, Rep. Prog. Phys. 66, 1463 (2003).
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Figures (5)

Fig. 1.
Fig. 1. Schematic of the stereo-ATI apparatus. Two TOF spectrometers located on opposite sides along the laser polarization (left/right) measure electron spectra of Xe ionized by few-cycle laser pulses. The asymmetry (A) in the number of photoelectrons on the left (L) and right (R) detectors, A = ( L R ) / ( L + R ) , is calculated in two regions in the plateau of the ATI spectra (low/high, bottom panel). From this, the value of the CEP can be retrieved; see Refs. [11,12,16,18].
Fig. 2.
Fig. 2. Feedback schematics. The oscillator seeds the OPCPA, and the amplified pulses are then measured by the CEPM from which a feedback signal can be generated and sent to a modulation input in the phase-locking system of the oscillator for CEP stabilization up to a bandwidth of 300 kHz. Details about the setup can be found for the oscillator in [19], OPCPA in [4], and CEPM in [12].
Fig. 3.
Fig. 3. Parametric asymmetry plot with 100,000 individual and consecutive laser shots acquired during 1 s without (blue) and with (green) active CEP stabilization. The CEP is encoded in the polar angle Θ of the circular shape and the pulse duration in the radius r ; for a detailed description, see Refs. [11,12,18]. In this example, the average radius corresponds to a pulse duration of 3.5 fs, and the individual CEP determinations have an uncertainty of 82 mrad or 35 as, estimated from the radius distribution Δ r .
Fig. 4.
Fig. 4. Evaluation of three CEP-traces. (a)–(c) Top row with active oscillator CEP stabilization only (open loop); (d)–(f) middle row with stereo-ATI CEP feedback on the oscillator; and (g)–(i) bottom row f-2f CEP feedback. The left column shows the short-term trace over 200 μs, and the middle column density plots over 20 s/2M shots with its histogram in the right column. For the oscillator-stable-only case, the SD over the 2M shots amounts to 399 mrad. While also including the stereo-ATI feedback, it is reduced to 252 mrad; a trace with the f-2f feedback yields 297 mrad.
Fig. 5.
Fig. 5. Power spectral density from a Fourier analysis of 1 M consecutive laser shots. Panel (a) shows a comparison of the open loop (oscillator CEP-locked only, black) and closed stereo-ATI feedback loop (red). The main noise components are denoted. The feedback with the stereo-ATI signal reduces the noise significantly over the full spectral range, except for a region near 25 kHz. Panel (b) shows a comparison of the f-2f feedback (black) and the stereo-ATI feedback (red).

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