光子学报, 2019, 48 (8): 0823002, 网络出版: 2019-11-28   

4.1 μm高功率中红外内腔光参量振荡器

4.1 μm High Power Mid-infrared Intra-cavity Optical Parametric Oscillator
作者单位
长春理工大学 理学院, 长春 130022
摘要
提出了一种紧凑型、声光调Q、高功率的4.1 μm中红外内腔式氧化镁掺杂的周期性极化铌酸锂晶体光参量振荡激光系统.基于内腔单谐振光参量振荡器动力学模型, 对内腔光参量振荡器的阈值倍数及下转换效率的影响因素进行分析, 提出实验中对光参量振荡阈值调节的办法, 优化了大功率情况下光参量振荡的下转换效率.引入共振泵浦与单端键合晶体方式提高了大功率泵浦的热稳定性.基于光场传输理论与谐振腔稳定性理论, 并考虑增益介质热效应, 数值模拟了大功率泵浦注入时腔内基频光、信号光及闲频光的三波光场模式匹配, 以确保光参量振荡器在高功率下稳定运转.对光参量振荡阈值进行调节, 提高了参量光的下转换效率, 最终得到4.125 μm的中红外高重频脉冲瓦级激光输出, 激光重复频率1~100 kHz可调, 脉冲宽度小于9 ns, 最高单脉冲能量36.7 J, 最高峰值功率4.257 kW, 最高输出功率为1.12 W, 其对应的下转换效率为29.7%, 最大光光转换效率为4.26%.
Abstract
A compact, acousto-optic Q-switched, high power 4.1 μm mid-infrared intra-cavity periodically poled lithium niobate crystal doped with magnesium oxide optically oscillating laser system was reported. Based on the dynamics model of the intra-cavity single resonant optical parametric oscillator, the overthreshold multiple of the intra-cavity optical parametric oscillator and the down-conversion efficiency of the optical parametric oscillator under high power was analyzed. The method of adjusting the threshold of optical parametric oscillation in the experiment was clarified and the down-conversion efficiency of optical parametric oscillation under high power was optimized. The introduction of in-band pumping and single-ended bonded crystal improved the thermal stability at high power pumping. Based on the optical field propagation theory and the resonant cavity stability theory, and considering the thermal effect of the gain medium, the three-wave fundamental mode pattern matching of fundamental frequency light, signal light and idle frequency light in the cavity was numerically simulated when the high-power pump was injected, in order to ensure the stable operation of the optical parametric oscillator at high power. The down-conversion efficiency of parametric laser was improved by adjusting the threshold of optical parametric oscillation. Finally, the output of mid-infrared high pulse repetition frequency watt-level laser at 4.125 μm was obtained, the laser repetition frequency were adjustable from 1 to 100 kHz, the pulse width was less than 9 ns, the maximum single-pulse energy was 36.7 μJ, the maximum peak power was 4.257 kW, the maximum output power was 1.12 W, the corresponding to down-conversion efficiency was 29.7%, and optical-optical conversion efficiency was 4.26%.

王宇恒, 刘贺言, 王泽宇, 刘洪志, 郑浩, 于永吉, 金光勇. 4.1 μm高功率中红外内腔光参量振荡器[J]. 光子学报, 2019, 48(8): 0823002. WANG Yu-heng, LIU He-yan, WANG Ze-yu, LIU Hong-zhi, ZHENG Hao, YU Yong-ji, JIN Guang-yong. 4.1 μm High Power Mid-infrared Intra-cavity Optical Parametric Oscillator[J]. ACTA PHOTONICA SINICA, 2019, 48(8): 0823002.

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