中国激光, 2019, 46 (1): 0101004, 网络出版: 2019-01-27
可低温工作的窄脉冲宽温激光器 下载: 861次
Narrow Pulse Width lasers Operating over Wide Range of Low Temperature
激光器 低温工作 垂直腔面发射激光器 宽温 lasers operate at low temperature vertical cavity surface emitting laser wide temperature
摘要
报道了一种可在低温环境下和100 ℃以上的宽温范围内稳定工作的纳秒级被动调Q的Nd∶YAG激光器。谐振腔采用抗失谐的双Porro棱镜组合腔型, 以热电制冷器控温的垂直腔面发射激光器侧面抽运Nd∶YAG板条晶体, 被动调Q晶体为Cr4+∶YAG。在抽运峰值功率为1 kW, 重复频率为1 Hz的条件下, 测量了激光器在不同温度下的工作情况。结果表明在-75~40 ℃温度范围内, 激光输出平均能量为18.79 mJ, 标准差为2.29 mJ, 脉宽约为4 ns, 近场光斑直径约为5 mm, 远场发散角小于0.9 mrad。激光器体积小、结构紧凑、可靠性高, 十分适合宽温范围尤其是低温环境下的空间激光应用。
Abstract
In this study, we describe a passively Q-switched Nd∶YAG nanosecond laser capable of operating stably over 100 ℃ and at low temperatures. The resonator is based on a stable, double-Porro-prism cavity structure. A Nd∶YAG slab is side-pumped via a vertical-cavity, surface-emitting laser array, and the temperature is controlled by a thermoelectric cooler. The passively Q-switched crystal is Cr4+∶YAG. We have tested the performance of the laser at different temperatures with a 1 kW peak pump power and 1 Hz repetition frequency. The results show that the average output energy of the laser is 18.79 mJ, the standard deviation is 2.29 mJ, the pulse width is ~4 ns, the near-field spot diameter is ~5 mm, and the far-field divergence angle is less than 0.9 mrad in the temperature range of -75-40 ℃. The lasers has a small size, compact structure, and high reliability. It is thus suitable for space-laser applications under a wide range of low-temperature conditions.
白家荣, 刘源, 钟朝阳, 孟洁, 施君杰, 王明建, 孟俊清, 侯霞, 陈卫标. 可低温工作的窄脉冲宽温激光器[J]. 中国激光, 2019, 46(1): 0101004. Bai Jiarong, Liu Yuan, Zhong Chaoyang, Meng Jie, Shi Junjie, Wang Mingjian, Meng Junqing, Hou Xia, Chen Weibiao. Narrow Pulse Width lasers Operating over Wide Range of Low Temperature[J]. Chinese Journal of Lasers, 2019, 46(1): 0101004.