光电技术应用, 2019, 34 (1): 6, 网络出版: 2019-06-12
用于赝热光鬼成像双波长高分辨激光光源研制
Development on High Resolution Dual Wavelength Passive Q-switched Laser System for Pseudo-thermal Light Source
被动调Q 倍频晶体 赝热光 二阶量子相关函数 passive Q-switched frequency conversion crystal pseudo-thermal light second-order quantum correlation function
摘要
报道了一种基于Cr4+:YAG晶体被动调Q的Nd:YAG纳秒脉冲激光器,重频在1~10 Hz可调。采用II类匹配的KTP进行倍频后获得稳定的532 nm激光输出。该激光器输出1 064 nm单脉冲能量大于800 mJ,脉冲宽度7 ns;532 nm激光单脉冲能量大于500 mJ,在不同重频下的输出能量分别为551 mJ@1 Hz,553 mJ@3 Hz,546 mJ@5 Hz和518 mJ@10 Hz,脉冲能量RMS<6.2%。光源入射到直径为20 cm的毛玻璃上,CCD采集图像经计算得到,该赝热光源的二阶量子相关函数g(2)为1.963,接近理论值2。该激光系统为赝热光鬼成像提供了良好的光源。
Abstract
A compact Nd:YAG nanosecond laser passively Q-switched by Cr4+:YAG crystal with the operation repetition tunable from 1 Hz to 10 Hz is reported. Type II phase match crystal of KTP is adopted for the frequency doubling to obtain the stable output of 532 nm laser pulse. The single laser pulse energy of 1 064 nm is approximately 800 mJ and the laser pulse width is around 7 ns. The output energy of 532 nm exceeds 500 mJ, and the average pulse energy at different operation repetition are given as 551 mJ@1 Hz, 553 mJ@3 Hz, 546 mJ@5 Hz and 518 mJ@10 Hz, respectively. The RMS of 532 nm laser pulse energy is less than 6.2%. When the laser beam is injected onto a ground glass of 20 cm, the spot image is measured by a scientific-level CCD. The result shows that the second-order quantum correlation function g(2) value of the pseudo-thermal light is 1.963, close to the theoretical value of 2. The laser system promises the improvement of Ghost imaging quality.
崔璨, 王雨雷, 吕志伟, 陈义, 白振旭, 远航, 郑振兴, 哈斯乌力吉. 用于赝热光鬼成像双波长高分辨激光光源研制[J]. 光电技术应用, 2019, 34(1): 6. CUI Can, WANG Yu-lei, LV Zhi-wei, CHEN Yi, BAI Zhen-xu, YUAN Hang, ZHENG Zhen-xing, Hasi W.. Development on High Resolution Dual Wavelength Passive Q-switched Laser System for Pseudo-thermal Light Source[J]. Electro-Optic Technology Application, 2019, 34(1): 6.