Using phase shaping, the impact of the Kerr effect in a fiber-based chirped-pulse amplification (CPA) system is experimentally controlled. The technique is based on an analytical model describing the spectral phase owing to self-phase modulation in CPA systems. The method relies neither on complex phase measurements nor on time-consuming optimization routines. Nearly transform-limited pulses with energies as high as 1mJ are produced, and a B integral being as high as 8rad is accumulated in the main amplifier. The value of the B integral is determined by the method itself.

© 2009 Optical Society of America

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2009 (2)

2008 (2)

2007 (2)

2006 (1)

1997 (1)

Barty, C. P. J.

Braun, A.

Daga, N. K.

Dawson, J. W.

Eidam, T.

Ermeneux, S.

Hädrich, S.

Hanna, D. C.

He, F.

Hung, H. S. S.

Kane, S.

Limpert, J.

Naz, N.

Norris, T.

Prawiharjo, J.

Price, J. H. V.

Richardson, D. J.

Röser, F.

Rothhardt, J.

Salin, F.

Schimpf, D. N.

Schmidt, O.

Schreiber, T.

Seise, E.

Shepherd, D. P.

Siders, C. W.

Tünnermann, A.

Yvernault, P.

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Figures (5)

Fig. 1
Fig. 1

Schematic of the experimental setup of the fiber-based CPA system with a phase-only pulse shaper. AOM, acousto-optical modulator; OSA, optical spectrum analyzer; AC, autocorrelator.

Fig. 2
Fig. 2

Normalized autocorrelation traces measured at B = 0 rad [light gray (green online)], and at B = 8 rad with phase-shaping [black (blue online)] and without phase shaping but with an adjustment of the compressor grating separation [dark gray (red online)].

Fig. 3
Fig. 3

Spectrum recorded with the optical spectrum analyzer (dotted curve) and corresponding spectral phase (solid curve), which is produced by the spatial light modulator at B = 8 rad .

Fig. 4
Fig. 4

Results from the phase measurement at B = 8 rad using FROG.

Fig. 5
Fig. 5

Output pulses for compensation using the model-based phase shaping, as well as only the compressor of the CPA system. Comparison of the retrieved pulses (FROG) and the theoretically expected behavior (theory) is also shown.

Equations (1)

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φ SPM ( Ω ) = B × s ( Ω ) ,