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报道了一个内腔式连续波、单谐振1.9μm和2.4μm双波长激光输出的光参量振荡器(OPO)。实验采用单管半导体激光二极管(LD)抽运掺钕钒酸钇(Nd…YVO4)晶体,腔内抽运掺氧化镁的周期性极化铌酸锂(PPMgLN)晶体,得到1.9μm和2.4μm双波长连续激光输出。在室温下,当LD功率为5.5 W时,同时获得了750mW、1.9μm波长的信号光和370mW、2.4μm波长的闲频光输出,光-光转换效率分别为13.6%和6.7%,总的转换效率达到了20%以上。测试5h,功率不稳定性小于1.8%。另外还对不同长度的PPMgLN晶体进行了阈值和转换效率的特性分析。通过输出波长稳定性测试发现,对晶体的温度进行更好地控制,可以改善波长漂移的现象。
An optical parametric oscillator (OPO) with lumen-type continuous wave, single-resonance 1.9μm and 2.4μm dual-wavelength laser outputs is reported. In the experiment, Nd: YVO4 Nd: YVO4 was pumped by a single-tube semiconductor laser diode (LD), and periodically poled MgO-doped periodically poled lithium niobate (PPMgLN) crystals to obtain 1.9μm and 2.4μm Dual wavelength continuous laser output. At room temperature, when the LD power is 5.5 W, the signal light of 750mW and 1.9μm wavelength and the idler light output of 370mW and 2.4μm wavelength are simultaneously obtained, and the light-to-light conversion efficiency is respectively 13.6% and 6.7% Conversion efficiency reached more than 20%. Test 5h, power instability less than 1.8%. In addition, PPMgLN crystals with different lengths were also analyzed for their threshold and conversion efficiency. Through the output wavelength stability test found that the temperature of the crystal to better control, can improve the phenomenon of wavelength drift.