1342nm激光通过周期极化钽酸锂产生红光和蓝光的研究

激光二极管(LD)抽运Nd：YVO4激光器通过周期极化的钽酸锂(PPLT)，利用非线性光学中倍频与和频的原理。为了实现准相位匹配调控周期极化钽酸锂的温度，当基频光与倍频光满足准相位匹配时，产生671nm的红光和447nm的蓝光。当1342nm基波的平均功率为1．58W时，输出671nm红光的最大平均功率为750mW，对应的匹配温度为92．3℃。半峰全宽温度值为3．2℃，输出447nm蓝光的最大平均功率为128mW。对应的匹配温度为83．2℃。半峰全宽温度值为4．5℃，其红光的光-光转换效率为47．4％，蓝光转换效率为8．1％。经过一段时间观察，由周期极化的钽酸锂倍频与和频得到的红光和蓝光输出稳定，结果显示周期极化的钽酸锂可以构造全固态红光和蓝光双波长激光器。

Red and Blue Light Generations in a Periodically Poled LiTaO3 by 1342 nm Laser

When incident fundamental wave and frequency-doubling wave were fitted to quasi-phase matching, with diode-pumped Q-switched 1342-nm Nd∶YVO4 laser, generations of red light at 671 nm and blue light at 447 nm in a periodically poled LiTaO3 (PPLT) were demonstrated. Principles of frequency-doubling and sum-frequency were applied in the course. Temperature of PPLT was modulated in order to accomplish quasi phase matching. When average power of 1342-nm fundamental wavelength was 1.58 W, the maximum average power of red light (671 nm) was 750 mW with corresponding matching temperature of 92.3℃ and temperature of full wave half width of 3.2℃, and the maximum average power of blue light (447 nm) was 128 mW with matching temperature of 83.2℃, temperature of full wave half width of 4.5℃. The optical-optical conversion efficiency of red light was 47.4% and that of the blue light was 8.1%. Output powers of red light and blue light were stable by double-frequency and sum-frequency in a PPLT for a longer time. These results indicated that PPLT may be used to construct an all-solid-state red and blue dual-wavelength laser.