We report efficient amplification of chirped supercontinuum pulses in a two-stage stimulated Raman amplifier based on double tungstate [
K
G
d
(
W
O
4
)
2
] crystals, pumped with 1.2 ps transform-limited pulses at a 1030 nm wavelength. The second stage demonstrates a conversion efficiency of 55% with an output pulse energy of 0.6 mJ at a 1135 nm wavelength. The amplified Stokes bandwidth is 10 times the pump bandwidth, providing 145 fs pulses after compression.
The combination of optical parametric and transient stimulated Raman amplification of chirped pulses demonstrates a new approach for idler energy buildup in the short-wave (SW)IR range. Optical parametric chirped-pulse amplification (OPCPA) output pulses in the wavelength range from ∼1800 nm to ∼2000 nm for the signal and from ∼2100 nm to ∼2400 nm for the idler were used as pump and Stokes seed, respectively, in a stimulated Raman amplifier based on a KGd(WO4)2 crystal. Both OPCPA and its supercontinuum seed were pumped with ∼1.2-ps transform-limited pulses from a Yb:YAG chirped-pulse amplifier. The transient stimulated Raman chirped-pulse amplifier provides a 33% increase in idler energy with nearly transform-limited ∼53-fs pulses after compression.
3-stage BiBO-based OPCPA pumped with ~1.2 ps, >10 mJ pulses at 1030 nm from Yb:YAG laser provides ~1.8 mJ, 38 fs output pulses at ~2150 nm after compression with a pump-to-signal conversion efficiency of ~30%.
For the first time, the signal-to-idler energy transfer with an efficiency of 33% was achieved by Transient Stimulated Raman Chirped-Pulse Amplification. Compression of the amplified idler pulse to ~50 fs was demonstrated.
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