腔内倍频454 nm脉冲蓝光Nd∶YLF激光器  

LD Pumped 454 nm Blue Pulsed Nd∶YLF Laser

作　　者：张一诺 马剑[1,2,3] 张俊旋 朱小磊 ZHANG Yinuo;MA Jian;ZHANG Junxuan;ZHU Xiaolei(Wangzhijiang Innovation Center for Laser,Aerospace Laser Technology and System Department,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;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天激光技术与系统部王之江创新中心,上海201800 [2]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 [3]中国科学院大学材料与光电研究中心,北京100049

出　　处：《光子学报》2024年第10期117-125,共9页Acta Photonica Sinica

基　　金：国家重点研发计划(No.2022YFB3901701);国家自然科学基金青年科学基金(No.62205358);中国科学院创新基金项目(No.CXJJ-22S005);国家自然科学基金重点项目(No.62031011);国家自然科学基金联合基金(No.U2106210)。

摘　　要：面向海洋激光应用,针对LD端面抽运的紧凑型准三能级Nd∶YLF晶体激光器实现454 nm蓝光激光脉冲输出特性开展了实验研究。设计了两种方案,电光调Q法和增益调制法,获得454 nm蓝光脉冲激光输出。在增益调制方法中,当重复频率为100 Hz时,Nd∶YLF晶体激光器腔内倍频获得了最大功率为3.16 mW的454 nm蓝光脉冲激光输出,脉冲宽度约为418 ns。而在电光调Q方法中,100 Hz的重复频率下,腔内倍频454 nm蓝光脉冲输出平均功率最大为23.62 mW,脉冲宽度约为66 ns,倍频效率约为3.7%。该研究为获得高重复频率、百纳秒脉宽的紧凑型蓝光454 nm波长脉冲激光提供参考。Blue-green laser,with its high optical transmittance and low transmission loss in seawater,is currently the only spectral band capable of penetrating the air-sea interface and seawater to achieve transmission at great depths.In recent years,with the rapid development of oceanic laser remote sensing and underwater communication,there is an increasingly urgent demand for compact and high frequency repetition rate blue-green pulse laser that can be combined with airborne platform to achieve information transmission and high-precision detection of oceanic vertical profile.The blue light in the spectral band of 450 nm to 490 nm has stronger penetrating ability for open ocean than green light,making it the optimal operating spectral band for oceanic lidar.To our knowledge,the only report of quasi-three-level frequencydoubled∶YLF laser is about its continuous operation.This study presents a blue pulse laser output at 454 nm for marine applications by intracavity frequency doubling of a pulse diode-pumped Nd∶YLF laser at 908 nm based on the quasi-three-level transition.Using 806 nm LD end-pumped Nd∶YLiF4(Nd∶YLF)crystal,a L-shaped laser resonator is built to suppress parasitic oscillation at 1047 nm,and successfully realize the quasi-three-level Nd∶YLF laser emitting at 908 nm.The resonator of the fundamental frequency laser consists of three mirrors:a concave input coupler with a curvature radius of 200 mm,a plane mirror inserted at 45°with respect to the optical axis,and a 908 nm output coupler with output transmission of 2.7%at 908 nm.This 45°mirror is highreflection coated at 908 nm and 454 nm,and anti-reflection coated at 1047 nm.Thus,the resonator is singly resonant at 908 nm.Two methods,electro-optic Q-switching and gain-switching,were proposed to obtain the fundamental frequency pulse laser.Thus,for the experimental setup of Q-switching method,a polarizer and a double-RTP Pockels were inserted in the resonator as a voltage-decreased electro-optical Q-switcher.A type-Ⅰcritical phase-matched LiB3O5(LBO

关 键 词：Nd∶YLF激光器 蓝光激光 腔内倍频 增益调制 电光调Q 

分 类 号：TN248.1[电子电信—物理电子学]