Qianjin Cui

High average power 1.5 microm eye-safe Raman shifting in BaWO4 crystals.

A nanosecond 1.3 microm Nd:YAG laser-pumped external cavity eye-safe Raman laser based on BaWO(4) crystal is efficiently demonstrated. The average power of 1.5 microm was 0.60 W operating at a pulse repetition rate of 1.7 kHz and an incident pump power of 4.14 W. Conversion efficiency of 14.5% and a high slope efficiency of 54.5% have been achieved. Pulse shortening was obviously observed. The pulse duration of the first Stokes was about 40 ns, much shorter than the fundamental pulse with a duration of approximately 220 ns.

2-\mum singly resonant optical parameter oscillator

We experimentally realize a singly resonant optical parameter oscillator (OPO) which operates at the degenerate point of KTiOPO4 (KTP) crystal. A thin film plate polarizer (TFP) is used as the output coupler to obtain linearly polarized 2.12 \mum laser. A maximum output power of 2.2 W at 2.12 \mum is obtained from a near-degenerate, type-II KTP OPO by utilizing a Q-switched diode-pumped Nd:YAG laser operating at 5 kHz.

A Highly Efficient Quasi-Continuous-Wave Diode-Pumped Nd: YAG Rod Laser with a 3.8 kW Output

A quasi-continuous-wave (QCW) Nd:YAG-rod laser with a 3.8 kW output and a 54% optical-optical efficiency is demonstrated by the stable zone control of resonator, which overcomes the limitations of thermal lens effect of Nd: YAG rod.