Opt Lett. 2018 Jun 1;43(11):2454-2457. doi: 10.1364/OL.43.002454.
We report a pulsed singly-resonant optical parametric oscillator (OPO) based on the new nonlinear crystal, orientation-patterned gallium phosphide (OP-GaP). Pumped by a Q-switched Nd:YAG laser at 1064 nm, and using a 40-mm-long OP-GaP crystal with a single grating period of Λ=16 μm, the OPO generates signal and idler output across 1.6-1.7 μm and 2.8-3.1 μm, respectively, under temperature tuning. For an average pump power of 4.8 W at 50 kHz pulse repetition rate, mid-infrared idler powers of up to ∼20 mW have been obtained at 2966 nm with high output stability. For pump pulses of ∼13 ns duration, the OPO generates ∼6 ns output signal pulses. From temperature-dependent wavelength tuning measurements at two different pump powers of 4.2 W and 1.2 W, a discrepancy of 11-17°C in the internal crystal temperature is estimated, implying that the OP-GaP sample suffers from increasing thermal effects at higher pump powers due to absorption.
我们报告了一种基于新型非线性晶体取向衬底磷化镓（OP-GaP）的脉冲单共振光参量振荡器（OPO）。该 OPO 采用 Q 开关 Nd:YAG 激光器在 1064nm 波长处泵浦，使用 40mm 长的单个光栅周期为 Λ=16μm 的 OP-GaP 晶体，在温度调谐下分别在 1.6-1.7μm 和 2.8-3.1μm 范围内产生信号和闲频输出。在 50kHz 脉冲重复率下，平均泵浦功率为 4.8W 时，在 2966nm 处获得了高达约 20mW 的中红外闲频功率，具有较高的输出稳定性。对于持续时间约为 13ns 的泵浦脉冲，OPO 可产生持续时间约为 6ns 的输出信号脉冲。从在两个不同泵浦功率（4.2W 和 1.2W）下的温度相关波长调谐测量中，估计晶体内部温度存在 11-17°C 的差异，这表明由于吸收，OP-GaP 样品在较高泵浦功率下会受到越来越严重的热效应影响。
