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High energy femtosecond fiber chirped pulse amplification system with adaptive phase control

F. He, H. S. S. Hung, J. H. V. Price, N. K. Daga, N. Naz, J. Prawiharjo, D. C. Hanna, D. P. Shepherd, D. J. Richardson, J. W. Dawson, C. W. Siders, and C. P. J. Barty

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Abstract

We demonstrate increased peak power from an Yb fiber CPA system operating with strong self-phase modulation by shaping the spectral-phase of the input pulses. An adaptive control loop used feedback from the output autocorrelation. We investigated pre-compensation of both SPM phase distortion at high energies, and residual dispersion from mismatched stretcher/compressor technologies at low energies. Phase shaping resulted in improved pulse quality. When using a bulk grating stretcher, shaping increased the autocorrelation peak by a factor of 2.9, and with a fiber stretcher, shaping increased the autocorrelation peak by a factor of 3.4. High-quality 800 fs, 65 µJ recompressed pulses were produced. This technique could benefit a wide variety of fiber amplifier systems and is self-optimising for operation at both low and high pulse energies.

©2008 Optical Society of America

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Figures (3)
Fig. 1.
Fig. 1. Schematic of fiber CPA system with adaptive phase control. (AOM=Acousto-Optic Modulator)

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Fig. 2.
Fig. 2. Results with bulk stretcher. (a) Autocorrelation without phase control at low energy and at 65 µJ. (b) Autocorrelation of 65 µJ pulses without (dashed blue) and with (solid red) phase shaping, and the flat-phase Fourier transform of the system output spectrum when shaping applied. (c) Spectra at the input (dashed blue) and output (solid red) of the pulse shaper. The phase applied is also shown. (d) System output spectra.

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Fig. 3.
Fig. 3. Results with fiber stretcher. (a), (c), (e) Autocorrelation traces: without (dashed blue) and with (solid red) phase shaping, and the flat-phase Fourier transform of the system output spectrum with shaping applied. (a) Low final energy, and low SPM in stretcher. (c) Low final energy, but high SPM in stretcher. (e) 65 µJ final pulses, and high SPM in stretcher. (b), (d), (f) System output spectra without (dashed blue) and with (solid red) phase shaping. The phase profiles applied are also shown.

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