基于光学超晶格的四波长近-中红外光参量振荡器

Four-Wavelength Near and Mid-Infrared Optical Parameter Oscillator Based on Superlattice

利用波长为1064 nm的光纤激光器作为抽运光源,采用具有双通道(极化周期分别为30μm和30.5μm)的化学计量比钽酸锂超晶格(PPSLT)晶体作为非线性工作介质,在PPSLT晶体温度为190oC时,获得了1568.4、1625.9、3078.8、3231.1 nm四波长近-中红外激光同时输出。在抽运功率为37 W,重复频率为50 k Hz时,获得了14.9 W近-中红外激光输出,四波长激光的功率分别为3.71、4.36、3.21、3.62 W。通过调节PPSLT晶体温度,可以实现可调谐输出。进一步优化光参量振荡器谐振腔,可以实现四波长相同功率输出。

Four-wavelength near＆mid-infrared laser （1568.4, 1625.9, 3078.8, 3231.1 nm） based on stoichiometric LiTaO3 superlattice （PPSLT） crystal is reported. The pump source is an optical fiber laser at 1064 nm wavelength. PPSLT has a dual-channels grating of 30 μm and 30.5 μm. When the pump power is 37 W, and repetition frequency is 50 kHz, the total output power reaches 14.9 W. The powers of the four wavelength lasers are 3.71, 4.36, 3.21 and 3.62 W, respectively. By adjusting the temperature of the PPSLT crystal, tunable output can be realized. Further optimization of optical parameter oscillator （OPO） resonant cavity will realize the equivalent output power of the four wavelength lasers.