We report efficient amplification of supercontinuum pulses in a stimulated Raman amplifier. The Yb:YAG pump laser produced 1.2 ps transform-limited pulses with an energy of 20 mJ at 100 Hz. Supercontinuum pulses in the wavelength range of 1050 – 2500 nm were obtained in a 15 mm YAG crystal. A larger portion of the laser energy was used to pump a two-stage stimulated Raman amplifier based on Np-cut KGW crystals with the main Stokes shifts of 768 and 901 cm-1 . Spectral broadening to ~16 nm of amplified pulses at 901 cm-1, conversion efficiency of 55%, and pulse width of ~145 fs after compression were demonstrated. Spectral synthesis of Stokes components at 768 and 901 cm-1 provides an even wider spectrum up to ~38 nm, which corresponds to ~50 fs transform-limited pulse. The differences between collinear and non-collinear TSRCPA configurations are investigated in terms of conversion efficiency and gain bandwidth.
We describe sub-TW class modular laser with multiple outputs in the visible and near-infrared wavelength range based on Optical Parametric Chirped Pulse Amplification (OPCPA) and Transient Stimulated Raman Chirped Pulse Amplification (TSRCPA). It provides 1.2 ps pulses with an energy of ~20 mJ at 1030 nm from two-stage double-pass Yb:YAG chirped pulse amplifier; ~20 fs pulses with an energy of <2 mJ at a central wavelength of 790 nm from OPCPA and 145 fs pulses with an energy of 0.6 mJ at a central wavelength of 1135 nm from TSRCPA. White light supercontinuum extending from 500 nm to 2300 nm in the YAG was used for seeding both a three-stage OPCPA based on BBO and a two-stage TSRCPA based on KGW crystals. The wide OPCPA bandwidth was maintained by the temporal shaping of pump pulses. We demonstrate the expansion of the spectrum of pulses amplified in the TSRCPA by ~10 times in comparison with the spectral bandwidth of the pump pulses. A maximum conversion efficiency of 55% was achieved in the second TSRCPA stage. The amplified pulses after compression were more than 8 times shorter than the pump pulses.
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