Abstract
High-order Stokes wave was observed in an x-cut KTP crystal based on stimulated Raman scattering (SRS) pumped by a passively Q-switched Nd:YLF laser with a Cr4+:YAG saturable absorber. Output spectra including the fundamental wave at 1047nm and six Stokes wavelengths at 1077nm, 1110nm, 1130nm, 1143nm, 1164nm, 1180nm based on two Raman frequency shift at 267.4cm−1 and 693.0cm−1 were obtained simultaneously. We also detected green light generation with output power of 12mW from self frequency mixing in the KTP crystal. The maximum total output power reached 452mW at the repetition frequency of 8.1kHz, corresponding to the optical-to-optical conversion efficiency of 4.61% and pump-to-Raman conversion efficiency of 3.6%.
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