532 nm激光泵浦单谐振光参量振荡器倍频蓝光技术  

Frequency-Doubling Blue Laser Technology with Singly-Resonant Optical Parametric Oscillator Pumped by 532 nm Laser

作　　者：王雅琦 朱小磊[1,2] 陆婷婷 马剑[1,2] 马浩达 张俊旋[1,2] Wang Yaqi;Zhu Xiaolei;Lu Tingting;Ma Jian;Ma Haoda;Zhang Junxuan(Key Laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所空间激光信息传输与探测技术重点实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2023年第22期41-46,共6页Chinese Journal of Lasers

基　　金：国家重点研发项目(2022YFC2808100);国家自然科学基金青年科学基金(62205358);国家自然科学基金重点项目(62031011);国家自然科学基金联合基金(U2106210);中国科学院创新基金(CXJJ-22S005)。

摘　　要：利用腔内倍频532 nm激光器抽运单谐振光学参量振荡器(SRO),设计了一种可输出972 nm激光的脉冲激光器,通过腔外倍频成功获得486 nm蓝光。在重复频率为1 kHz的条件下,当532 nm激光脉冲能量为3.87 mJ时,972 nm SRO信号光单脉冲能量可达0.96 mJ,此时获得最大转换效率24.8%,与理论计算值22.3%相近。倍频后获得最大能量为49μJ的486 nm蓝光脉冲,脉冲宽度约为6.9 ns,最大倍频效率为5.3%。Objective Blue-green lasers have been widely used in ocean lidar systems owing to the optical transmission window of seawater.Researchers have found that green lasers in the 520-580 nm region penetrate deeper into coastal seawater,whereas blue lasers in the 420-510 nm region are more suitable for deep clean seawater.Comprehensively considering the lidar detection range and signal-tonoise ratio,a blue laser at approximately 488 nm has significant advantages for global ocean exploration.If the working wavelength of a laser detection system is located at 486.1 nm,which is also at the Fraunhofer dark line of the solar spectrum,the signal-to-noise ratio can be further improved,and the working hours can be extended.Generally,there are two methods to obtain a blue laser with a wavelength of more than 480 nm:one is based on a frequency-quadrupling Tm-doped fiber laser,and the other is based on an optical parametric oscillator pumped using a 355 nm laser.This study presents a novel method for obtaining a 486 nm blue laser using an optical parametric oscillator based on frequency-doubling technology.The optical parametric oscillator is pumped using a homemade 532 nm laser to avoid damage caused by an ultraviolet laser.We hope that this novel method will provide a reliable laser source for ocean laser detection systems.Methods The laser system consists of three components:a homemade 532 nm pump laser,a 972 nm singly resonant optical parametric oscillator,and a frequency-doubling unit from 972 nm to 486 nm.A homemade 532 nm pulse laser with 1 kHz repetition rate and 9.2 ns pulse duration,which is provided by an intra-cavity frequency-doubling electro-optical Q-switched Nd∶YAG laser,is used as the pump source for the optical parametric oscillator.To improve the peak power density of the 532 nm pump laser,a shrink-beam system is placed before the optical parametric oscillator cavity.Then,the 532 nm laser is used as the pump source of the singly resonant optical parametric oscillator.The optical parametric oscillator cavity i

关 键 词：激光光学 蓝光激光 光参量振荡 腔外倍频 三硼酸锂晶体 全固态激光 

分 类 号：TN248.1[电子电信—物理电子学]