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为了改善内腔连续光参量振荡器(IC-OPO)输出功率不稳定,弛豫振荡严重等问题,对ICOPO进行了改进:(1)采用热透镜补偿设计,改善模式匹配;(2)使用光阑限模,抑制高阶模振荡;(3)在腔内加入KTP晶体,利用二次谐波产生(SHG)过程的非线性损耗抑制弛豫振荡。通过改进,获得了稳定的紧凑型2.2~4.2μm的可调谐连续波中红外光源。输出功率波动标准偏差(RMS)0.52%,峰值波动范围1.8%,光束质量因子M~2=1.72,弛豫振荡得到有效抑制。当腔内不加入KTP晶体时,阈值(808 nm)仅为1.5 W。据笔者所知,该阈值为国内相关工作报道中的最低值。
In order to improve the ICOPO output power instability, severe relaxation relaxation and other issues, the ICOPO has been improved: (1) the use of thermal lens compensation design to improve the pattern matching; (2) the use of light (3) KTP crystals are added into the cavity, and the relaxation relaxation is suppressed by the nonlinear loss of the second harmonic generation (SHG) process. Through the improvement, a stable and compact 2.2 ~ 4.2μm tunable continuous wave mid-infrared light source was obtained. The output power fluctuation standard deviation (RMS) 0.52%, the peak fluctuation range of 1.8%, the beam quality factor M ~ 2 = 1.72, the relaxation oscillation is effectively suppressed. When KTP crystals are not added to the cavity, the threshold (808 nm) is only 1.5 W. As far as I know, this threshold is the lowest reported in the related work in China.