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基于非临界相位匹配,尺寸4mm×4mm×25mm的磷酸钛氧铷(RTP)非线性光学晶体,在全固态1.62μm光参量振荡器(OPO)方面做了相关的实验研究,将808nm半导体激光端面抽运的Nd:YVO41.064μm激光模块应用于腔外RTP-OPO,获得了高效稳定的光参量输出。对比了不同OPO腔长、不同声光调Q频率对信号光平均输出功率和信号光脉宽的影响,在3.4 W抽运功率、23kHz的重复频率和4cm OPO腔长下获得最高平均功率为1.1 W的1.619μm信号光输出,抽运光-信号光转换效率高达32.3%,总光-光转换效率为8.5%。在最高输出功率1.1 W下得到单脉冲宽度4ns,比基频光脉冲宽度(30ns)小得多。
Based on the non-critical phase matching, size 4mm × 4mm × 25mm RTP nonlinear optical crystals, the experimental study on all-solid-state 1.62μm Optical Parametric Oscillator (OPO) has been done. The 808nm semiconductor laser face The pumped Nd: YVO41.064μm laser module is applied to the extraluminal RTP-OPO, and the efficient and stable optical parametric output is obtained. The influence of different OPO cavity lengths and different acousto-optic Q-switched frequencies on average signal power and signal light pulse width was compared. The maximum average power at 3.4 W pump power, 23 kHz repetition frequency and 4 cm OPO cavity length was 1.1 W 1.619μm signal light output, pumping light - signal light conversion efficiency of up to 32.3%, the total optical - optical conversion efficiency of 8.5%. A single pulse width of 4 ns at a maximum output power of 1.1 W is much smaller than the pulse width of the fundamental light pulse (30 ns).