中国激光, 2008, 35 (10): 1459, 网络出版: 2008-10-24
基于周期极化铌酸锂晶体的高功率可调谐光参量振荡器
High-Power Temperature-Tunable Periodically-Poled Lithium Niobate Optical Parametric Oscillator
非线性光学 准相位匹配 温度调谐 镁掺杂周期极化铌酸锂晶体 光学参量振荡 nonlinear optics quasi-phase-matched temperature-tunable periodically-poled lithium niobate optical parametric oscillator
摘要
研究了镁掺杂周期极化铌酸锂晶体光学参量振荡(PPMgLN-OPO)产生高功率、高重复频率中红外激光的特性。采用半导体激光器(LD)抽运的声光调Q Nd:YAG激光器,1064 nm准连续激光功率最大输出为7.8 W,重复频率5~50 kHz。产生1064 nm调Q光,抽运周期为30.7 μm的掺氧化镁(摩尔分数为5%)周期性极化铌酸锂晶体,温度变化范围为40~200 ℃,实现了短腔双谐振红外高功率激光输出。实验中近红外激光波长调谐范围为1570~1676 nm,最高输出功率613 mW; 中红外输出波长范围为2942~3300 nm,中红外光平均功率也达到了百毫瓦级,信号光单脉冲能量达40 μJ;光-光(LD-信号光)转换效率为3.4%。
Abstract
A high-rate and high-power optical parametric oscillator is experimentally demonstrated. 1064 nm Q-switched Nd:YAG laser is pumped by laser diode (LD) laser. The maximal output power is 7.8 W with the pulses repetition rate range of 5~50 kHz. Optical parametric oscillator (OPO) based on periodically-poled lithium niobate (PPMgLN) pumped by the 1064 nm Q-switched Nd:YAG laser. Periodically poled grating (Λ=30.7 μm) was successfully fabricated in 1.0 mm thick MgO:LiNbO3 (doped 5% MgO). The output infrared wavelength will change because of the expansion coefficient of PPLN material when the operating temperatures fluctuate from 40 to 200 ℃. The tuning dimensions of the infrared wavelength are 1570~1676 nm and 2942~3300 nm with the signal maximal power of 613 mW. Several hundred milliwatt of output idler average power was obtained by using short and dual-cavity, the energy of single pulse is 40 μJ, and the conversion efficiency is 3.4%.
杨剑, 李晓芹, 姚建铨, 邴丕彬. 基于周期极化铌酸锂晶体的高功率可调谐光参量振荡器[J]. 中国激光, 2008, 35(10): 1459. Yang Jian, Li Xiaoqin, Yao Jianquan, Bing Pibin. High-Power Temperature-Tunable Periodically-Poled Lithium Niobate Optical Parametric Oscillator[J]. Chinese Journal of Lasers, 2008, 35(10): 1459.