Abstract
An intra-cavity optical parametric oscillator (OPO) emitting at 1.7μm derived by Nd:YVO4 self-Raman laser is demonstrated in this Letter, with a KTiOAsO4 (KTA) crystal used as nonlinear optical crystal. A laser diode end-pumped acousto-optic Q-switched Nd:YVO4 self-Raman laser at 1176nm was employed as the pump source. At an incident pump power of 12.1W and a pulse repetition frequency of 60kHz, average output power up to 1.2W signal light at 1742nm was obtained, with diode-to-signal conversion efficiency of 10%. The pulse width was about 11ns and spectral line width was less than 0.5nm for the signal light. The results show that compact intra-cavity KTA-OPO derived by Nd:YVO4 self-Raman laser is an efficient method for 1.7μm waveband laser generation, with potential applications in biological imaging, laser therapy, special materials processing, etc.
Published Version
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