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Low-threshold midinfrared optical parametric oscillation in periodically poled KTiOPO4

机译：周期性极化KTiOPO4中的低阈值中红外光学参量振荡

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Abstract: In this work we demonstrate low-threshold oscillation in the mid-IR spectral region with periodically poled KTiOPO$-4$/ (PPKTP) pumped at 1064 nm by a single-frequency Nd:YAG laser. THe compact pump laser had a diode-pumped passively Q-switched monolithic ring cavity configuration and could generate up to 70 $mu@J, 2 ns pulses. With two PPKTP crystals having ferroelectric domain inversion periods of 37.8 $mu@m, the temperature tuning bands for the signal of 1720-1750 nm and 1850-1920 nm have been obtained. The lowest oscillation threshold of 8.3 $mu@J was obtained in a cavity using two mirrors reflecting 99 percent at the signal and the idler wavelengths. The maximum OPO output power of 6 mW and the pump depletion of 39 percent was achieved by driving cavity close to stability limit for the idler field. The output power was substantially increases to 36 mW by using output mirror with 90 percent reflectivity only in the signal band and optimizing pump focusing conditions. The external OPO efficiency in this case reached 21 percent. !17
机译：摘要：在这项工作中，我们演示了通过单频Nd：YAG激光器在1064 nm处泵浦的周期性极化KTiOPO $ -4 $ /（PPKTP）在中红外光谱区域中的低阈值振荡。紧凑型泵浦激光器具有二极管泵浦的无源Q开关单片环形腔结构，可产生高达70μJ@ 2 ns的脉冲。用两个具有37.8μμm的铁电畴反转周期的PPKTP晶体，获得了1720-1750nm和1850-1920nm信号的温度调谐带。在腔中使用两个反射镜，在信号和惰轮波长处反射99％的最低振荡阈值为8.3μmuJ。通过驱动空腔接近惰轮场的稳定极限，可实现6 mW的最大OPO输出功率和39％的泵损耗。通过使用仅在信号频带内具有90％反射率的输出镜并优化泵浦聚焦条件，输出功率实质上增加到36 mW。在这种情况下，外部OPO效率达到21％。 ！17

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