Abstract

A nonlinear filter using rotation of the polarization ellipse in air is investigated. Scheme to enhance the temporal contrast is developed for a double-CPA multi-terawatt Ti:sapphire laser. It supports an energy level of millijoule and has a high efficiency. The method allows suppression of the ASE pedestal, pre- and post-pulses by 3 orders of magnitude and also steepens the pulse front. For the physical interpretation of the results, numerical simulation of the filtering is performed.

© 2004 Optical Society of America

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References

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  1. World lasers : <a href="http://wwwapr.apr.jaeri.go.jp/jaeri/e/ICUIL/ICUIL01.php">http://wwwapr.apr.jaeri.go.jp/jaeri/e/ICUIL/ICUIL01.php</a>
  2. M. Pittman, S. Ferré, J.P. Russeau, L. Notebaert, J.P. Chambaret, G. Chériaux, �??Design and characterization of a near-diffraction-limited femtosecond 100-TW 10-Hz high-intensity laser system,�?? Appl. Phys. B 74, 529�??535 (2002).
    [CrossRef]
  3. M.P. Kalachnikov, V. Karpov, H. Schoennagel, W. Sandner, �??100-terawatt titanium-sapphire laser system,�?? Laser Physics 12, 368-374 (2002).
  4. M. Aoyama, K. Yamakawa, Y. Akahane, J. Ma, N. Inoue, H. Ueda, and H. Kiriyama, �??0.85-PW, 33-fs Ti:sapphire laser,�?? Opt. Lett. 28, 1594-1596 (2003).
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  5. S. -W. Bahk, V. Chvykov, G. Kalintchenko, A. Maksimchuk, G.A. Mourou, N. Saleh, and V. Yanovsky, �??Generation, amplitude and phase characterization of 1021W/cm2 intensity,�?? Ultrafast Optics IV 95 , 331 (Springler_Verlag, Berlin 2004).
    [CrossRef]
  6. F. Billhardt, M. Kalashnikov, P.V. Nickles, I. Will, �??A high-contrast ps-terawatt Nd:glass laser system with fiberless chirped pulse amplification,�?? Opt. Commun. 98, 99-104 (1993).
    [CrossRef]
  7. H. Haas, M. Kaluza, S. Karsch, J. Stein, and K.J. Witte �??Controllable ASE pedestal on Atlas, �?? presented at the SHARP - project meeting, Berlin, May. 23.-24. 2004.
  8. A. Fernandez, T. Fuji, A. Poppe, A. Fürbach, F. Krausz, A. Apolonski, �??Chirped-pulse oscillators: a route to high-power femtosecond pulses without external amplification,�?? Opt. Lett. 29, 1366-1368 (2004).
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  10. J. Itatani, J. Faure, M.Nantel, G. Mourou and S.Watanabe �??Suppression of the amplified spontaneous emission in chirped-pulse amplification lasers by clean high-energy seeded-pulse injection,�?? Opt. Commun. 148, 70-74 (1998).
    [CrossRef]
  11. Y. Kitagawa, H. Fujita, R. Kodama, H. Yoshida, S.Matsuo, T. Jitsuno, T.Kawasaki, H.Kitamura, T.Kanabe, S.Sakabe, K.Shigemori, N.Miyanaga, Y.Izawa, "Prepulse-free petawatt laser for a fast ignitor,�?? IEEE J. Quant. Electron. 40, 281- 293 (2004).
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  21. M.P. Kalashnikov, E. Risse, H. Schönnagel, Max-Born-Institute Berlin, are preparing a manuscript to be called �??Double-CPA laser : way to temporally clean pulses�??.

Appl. Phys. B (1)

M. Pittman, S. Ferré, J.P. Russeau, L. Notebaert, J.P. Chambaret, G. Chériaux, �??Design and characterization of a near-diffraction-limited femtosecond 100-TW 10-Hz high-intensity laser system,�?? Appl. Phys. B 74, 529�??535 (2002).
[CrossRef]

IEEE J. Quant. Electron. (1)

Y. Kitagawa, H. Fujita, R. Kodama, H. Yoshida, S.Matsuo, T. Jitsuno, T.Kawasaki, H.Kitamura, T.Kanabe, S.Sakabe, K.Shigemori, N.Miyanaga, Y.Izawa, "Prepulse-free petawatt laser for a fast ignitor,�?? IEEE J. Quant. Electron. 40, 281- 293 (2004).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

M. Nantel, J. Itatani, A.C. Tien, J. Faure, D. Kaplan, M. Bouvier, T. Buma, P. Van Rompay, J. Nees, P. Pronko, D. Umstadter, and G. Mourou, �??Temporal Contrast in Ti:Sapphire Lasers: Characterization and Control,�?? IEEE J. Sel. Top. Quantum Electron. 4, 449-458 (1998).
[CrossRef]

Laser Physics (1)

M.P. Kalachnikov, V. Karpov, H. Schoennagel, W. Sandner, �??100-terawatt titanium-sapphire laser system,�?? Laser Physics 12, 368-374 (2002).

Opt. Commun. (2)

F. Billhardt, M. Kalashnikov, P.V. Nickles, I. Will, �??A high-contrast ps-terawatt Nd:glass laser system with fiberless chirped pulse amplification,�?? Opt. Commun. 98, 99-104 (1993).
[CrossRef]

J. Itatani, J. Faure, M.Nantel, G. Mourou and S.Watanabe �??Suppression of the amplified spontaneous emission in chirped-pulse amplification lasers by clean high-energy seeded-pulse injection,�?? Opt. Commun. 148, 70-74 (1998).
[CrossRef]

Opt. Express (1)

Opt. Lett. (6)

Proceedings of Ultrafast Optics 2001 (1)

G. Cheriaux, T. Planchon, F. Auge, G. Mourou, and J.P. Chambaret, in Proceedings of Ultrafast Optics 2001 (Springer-Verlag, Heidelberg, 2001), p. 16.

Ultrafast Optics IV (1)

S. -W. Bahk, V. Chvykov, G. Kalintchenko, A. Maksimchuk, G.A. Mourou, N. Saleh, and V. Yanovsky, �??Generation, amplitude and phase characterization of 1021W/cm2 intensity,�?? Ultrafast Optics IV 95 , 331 (Springler_Verlag, Berlin 2004).
[CrossRef]

Other (6)

H. Haas, M. Kaluza, S. Karsch, J. Stein, and K.J. Witte �??Controllable ASE pedestal on Atlas, �?? presented at the SHARP - project meeting, Berlin, May. 23.-24. 2004.

R.W. Boyd, Nonlinear Optics (Academic, San Diego, Calif., 1992), p. 170.

Europeean �??SHARP�?? �?? project (Suppression over High dynamic range of ASE at the Rising edge of ultra-intense femtosecond Pulses) Europeean Community -Access to Research Infrastructure action of the Improving Human Potential Program, Contract Nr. : HPRI-CT-2001-50037.

G. P. Agraval, Nonlinear fiber optics (Academic press, Rochester, 1994).

M.P. Kalashnikov, E. Risse, H. Schönnagel, Max-Born-Institute Berlin, are preparing a manuscript to be called �??Double-CPA laser : way to temporally clean pulses�??.

World lasers : <a href="http://wwwapr.apr.jaeri.go.jp/jaeri/e/ICUIL/ICUIL01.php">http://wwwapr.apr.jaeri.go.jp/jaeri/e/ICUIL/ICUIL01.php</a>

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Figures (6)

Fig. 1.
Fig. 1.

Scheme of the experimental set-up of the front end of the DCPA Ti:sapphire laser

Fig. 2
Fig. 2

Near- field distribution of the the short filtered beam depending on the pulse chirp. A- positively chirped pulse with duration of ~ 200 fs, b- recompressed pulse of ~ 40 fs, c- negatively chirped pulse of ~ 400 fs duartion. The case ‘a’ corresponds to the best filtering efficiency.

Fig. 3.
Fig. 3.

Spectral properties of the pulse subjected to nonlinear filtering. The curve colors correspond to the incoming beam (red), filtered short pulse (green) and non-filtered rest (blue). The 3 cases (a–c) follow the pictures shown in Fig.2.: a- positively chirped pulse with duration of ~ 200 fs (best conversion), b- recompressed pulse of ~ 40 fs, c- negatively chirped pulse of ~ 400 fs duration.

Fig. 4.
Fig. 4.

Temporal structure of the amplified pulse before passing through the filter (blue) and after the filter (red). The pulses arising around the main pulse are correlator artifacts associated with internal reflections from optical components of the device. Suppression of the post-pulse of ~ 1000 is evident.

Fig. 5.
Fig. 5.

Results of numerical calculations for the positively-chirped 200-fs input pulse. In (a), the intensities of the input (red) and filtered (green) pulses are presented together with the instantaneous wavelength (blue). In (b), the spectra of input (red), filtered (green) and non-filtered rest (blue) are presented.

Fig. 6.
Fig. 6.

Results of numerical calculations for the non-chirped 36-fs input pulse. In (a), the intensities of the input (red) and filtered (green) pulses are presented together with the instantaneous wavelength (blue). In (b), the spectra of input (red), filtered (green) and non-filtered rest (blue) are presented.

Equations (4)

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T ( t ) = exp ( iΔφ ( t ) ) sin ( cos 2 α 0 Δψ ( t ) 2 ) sin ( 2 α 0 ) .
Δ n K = ( 1 f ) n 2 I ( t ) ,
Δ n R ( t ) = f A n 2 0 I ( t τ ) exp ( τ T 1 ) sin ( τ ω R ) d τ ,
Δ n P ( t ) = n e ( t ) e 2 ( 2 ε 0 m e ) .

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