LD端面抽运Nd:YLF/KTA连续光参量振荡激光

采用非临界相位匹配切割，尺寸5 mm×5 mm×20 mm的KTA作为非线性光学晶体，进行了基于半导体激光端面抽运Nd:YLF/KTA的内腔式连续光学参量振荡激光研究，获得了中红外3.5 μm波段的连续激光输出。为了提高连续光参量振荡腔内信号光的功率密度，降低激光输出阈值，采用对信号光高反射的单谐振腔结构进行激光实验。在8.35 W的抽运功率下，分别获得了335 mW和110 mW 的3440 nm和1505 nm的激光输出，对应的总转换效率达到了5.6%。该实验研究表明半导体激光端面抽运的内腔式KTA连续光学参量振荡也能获得高效的中红外激光输出。

Abstract

This paper reports a continuous-wave 3.5 μm mid-infrared laser based on LD end-pumped Nd:YLF/KTA intra-cavity optical parametric oscillator (OPO). A non-critical phase matching cut KTA crystal with 5 mm×5 mm×20 mm in size was adopted as the nonlinear optics crystal. A singly resonant oscillator with high reflectivity at signal light was designed to improve the power intensity of the signal light in the OPO cavity and reduce the threshold. The maximum output powers of 335 mW at 3440 nm and 110 mW at 1505 nm were obtained at the pump power of 8.35 W. The total conversion efficiency of 5.6% was achieved with respect to the same incident diode pump power. The results show that continuous-wave KTA-OPO derived by LD pumped solid laser also can produce efficient mid-infrared light.

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凤正荣, 段延敏, 李志平, 王鸿雁, 郑崇伟, 张耀举, 张戈, 朱海永. LD端面抽运Nd:YLF/KTA连续光参量振荡激光[J]. 强激光与粒子束, 2013, 25(6): 1341. Feng Zhengrong, Duan Yanmin, Li Zhiping, Wang Hongyan, Zheng Chongwei, Zhang Yaoju, Zhang Ge, Zhu Haiyong. LD end-pumped Nd:YLF/KTA continuous-wave optical parameter oscillator[J]. High Power Laser and Particle Beams, 2013, 25(6): 1341.

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