Nonlinear methods of generation of eye-safe radiation: periodically polled crystals PPLN and PPKTP

Waldemar Zendzian

doi:10.1117/12.532102

6 October 2003 Nonlinear methods of generation of eye-safe radiation: periodically polled crystals PPLN and PPKTP

Waldemar Zendzian

Author Affiliations +

Proceedings Volume 5230, Laser Technology VII: Progress in Lasers; (2003) https://doi.org/10.1117/12.532102
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

We present the results of investigations on OPO systems, operating at the 'eye safe' region λ=1.5÷1.6μm. The peak power of 0.65 MW with 1.9-mJ energy at 1572 nm-wavelngth was demonstrated in a simple singly resonant OPO intracavity pumped by passively Q-switched Nd:YAG slab laser with 300 W quasi-cw diode array as a pump unit. The KTP crystal, of 5×5×20 mm³ size, 'x-cut' for non-critically phase-matched parametric generation at the signal wavelength of 1572 nm, was used as nonlinear converter. The five-fold shortening of signal pusle duration with respect to 1064-nm pump radiation was observed. The conversion efficiency of 44% with respect to 1064-nm pump energy and 3.8% with respect to diode pump energy was demonstrated. As a pump source for the extracavity OPO with PPLN (Λ=29.6 μm) the diode pumped acousto-optically q-switched Nd:YVO₄ laser of 2.5-W average power was used. The conversion efficiency of 43% was demonstrated. The pulses of 110 μJ energy, 7.8 ns duration and up to 10 kHz repetition rate were obtained. The signal wavelengh was temperature tuned from 1.510 μm to 1.560 μm.

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Waldemar Zendzian "Nonlinear methods of generation of eye-safe radiation: periodically polled crystals PPLN and PPKTP", Proc. SPIE 5230, Laser Technology VII: Progress in Lasers, (6 October 2003); https://doi.org/10.1117/12.532102

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