Abstract

We propose and experimentally demonstrate single-shot, real-time ultrashort pulse intensity and phase characterization using a self-referenced and highly sensitive (linear) technique. The proposed method is based on a direct reconstruction of the spectral phase of the pulse-under-test (PUT) from three different measured spectra, two of which are obtained by a suitable time-synchronized electro-optic intensity modulation of the PUT. The required set of spectra are temporally interleaved and mapped along the time domain by linear dispersion for single-shot acquisition using a real-time scope. A dynamic nonlinear compression experiment of a picosecond pulse is fully monitored in real time using the proposed method.

© 2010 Optical Society of America

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References

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  1. C. Dorrer and I. Kang, J. Opt. Soc. Am. B 25, A1 (2008).
    [CrossRef]
  2. I. Kang and C. Dorrer, Opt. Lett. 30, 1545 (2005).
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  3. J. Bromage, C. Dorrer, I. A. Begishev, N. G. Usechak, and J. D. Zuegel, Opt. Lett. 31, 3523 (2006).
    [CrossRef] [PubMed]
  4. J. Azaña, Y. Park, T.-J. Ahn, and F. Li, Opt. Lett. 33, 437 (2008).
    [CrossRef] [PubMed]
  5. Y. Park, T.-J. Ahn, J.-C. Kieffer, and J. Azaña, Opt. Express 15, 4597 (2007).
    [CrossRef] [PubMed]
  6. Y. Park, T.-J. Ahn, F. Li, and J. Azaña, IEEE Photon. Technol. Lett. 20, 1115 (2008).
    [CrossRef]

2008 (3)

2007 (1)

2006 (1)

2005 (1)

Ahn, T.-J.

Azaña, J.

Begishev, I. A.

Bromage, J.

Dorrer, C.

Kang, I.

Kieffer, J.-C.

Li, F.

Y. Park, T.-J. Ahn, F. Li, and J. Azaña, IEEE Photon. Technol. Lett. 20, 1115 (2008).
[CrossRef]

J. Azaña, Y. Park, T.-J. Ahn, and F. Li, Opt. Lett. 33, 437 (2008).
[CrossRef] [PubMed]

Park, Y.

Usechak, N. G.

Zuegel, J. D.

Supplementary Material (2)

» Media 1: AVI (496 KB)     
» Media 2: AVI (1666 KB)     

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Figures (3)

Fig. 1
Fig. 1

(a) Schematic diagram of the basic operation principle. (b) Schematic of the processing scheme enabling single-shot acquisition and full reconstruction of ultrashort optical pulses.

Fig. 2
Fig. 2

(a) Schematic of proof-of-concept experimental setup: POL, polarizer; PC, polarization controller; MZM, EO Mach–Zehnder modulator; LCFG, linearly chirped fiber Bragg grating; EDFA, erbium-doped fiber amplifier; and Real-Time OSC, real-time oscilloscope. (b) Synchronization of the two time-delayed copies of the PUT (red lower curve) and the RF modulation signal (blue upper curve).

Fig. 3
Fig. 3

Single-shot, real-time ultrashort pulse measurement: experimentally reconstructed (blue solid upper curve) and numerically calculated (dashed curve) spectral phase profiles of the PUT dispersed by (a) a 100 m SMF and (b) by a 50 m NZDSF. The pulse spectrum is shown with the black solid lower curve. (c) Reconstructed spectral phase profiles of an optical pulse temporally compressed by a nonlinear fiber for two different input powers of 32.5 μW (circles) and 185 μW (squares). The spectrum profiles of the compressed pulses are also shown. (d) Reconstructed temporal intensity and phase profiles of the compressed pulses. Single-frame excerpts from dynamic movies demonstrating real-time acquisition and direct reconstruction associated with Figs. 3a, 3c, 3d are also shown in Figs. 3e (Media 1) and 3f (Media 2), respectively.

Equations (2)

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y ^ + ( t ) T 0 / 2 · [ 1 + A · Ω t ] · x ^ ( t ) ,
| Y ^ + ( ω ) | 2 | Y ^ ( ω ) | 2 = 2 T 0 A Ω | X ^ ( ω ) | 2 Φ ( ω ) ω .

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