自调Q蓝光半导体碟片激光器及其在水下通信中的应用  

Self-Q-Switched Blue Semiconductor Disk Laser and Its Application in Underwater Wireless Optical Communications

作　　者：沈小雨 王涛 朱仁江[1] 蒋丽丹[1] 佟存柱[2] 宋晏蓉[3] 张鹏[4] Shen Xiaoyu;Wang Tao;Zhu Renjiang;Jiang Lidan;Tong Cunzhu;Song Yanrong;Zhang Peng(College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,Jilin,China;Faculty of Sciences,Beijing University of Technology,Beijing 100124,China;National Center for Applied Mathematics in Chongqing,Chongqing Normal University,Chongqing 401331,China)

机构地区：[1]重庆师范大学物理与电子工程学院,重庆401331 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [3]北京工业大学理学部,北京100124 [4]重庆师范大学重庆国家应用数学中心,重庆401331

出　　处：《中国激光》2025年第1期32-39,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金面上项目(61975003,61790584,62025506);在渝本科高校与中国科学院所属院所合作项目(HZ2021007);重庆市自然科学基金(CSTB2024NSCQ-MSX0833);重庆市教委科技计划(KJQN202200557,KJQN202300525);重庆师范大学基金(23XLB003)。

摘　　要：蓝光波段是水下无线光通信的窗口,高性能的蓝光激光器是水下无线光通信的理想光源。利用半导体碟片激光器增益芯片中的Kerr效应,在半导体碟片激光器中实现了稳定的自调Q输出,激光波长为982 nm。利用5 mm长的三硼酸锂(LBO)晶体进行腔内倍频,实现了脉冲宽度为8 ns、重复频率为61.9 MHz、平均输出功率为702 mW的高功率自调Q蓝光输出。基于上述脉冲蓝光激光器,搭建了水下无线光通信系统,并在不同数据传输速率和不同Maalox溶液浓度下,比较了自调Q脉冲蓝光与连续蓝光的通信性能。实验表明,在相同条件下,自调Q脉冲蓝光通信的误码率比连续蓝光的误码率降低了约一个数量级。Objective The blue waveband is the window for underwater wireless optical communication,and high-performance blue lasers are the ideal light source for underwater wireless optical communication.Pulsed blue lasers have high peak power than that of continuouswave laser,experience less attenuation during underwater transmission and have better communication performance.As an important technique for obtaining pulsed lasers,Q-switching has been widely used in solid-state lasers.However,for semiconductor lasers,it is difficult to obtain large pulse energy or high peak power due to the nanosecond short lifetime of the carriers.But in the other hand,Q-switched semiconductor lasers can produce pulse trains with higher repetition rates because of their shorter carrier lifetime,and combined with their flexible and designable emitting wavelengths,their application range can also be expanded.Methods In the gain chip of a semiconductor disk laser(SDL),there exists the nonlinear Kerr effect in the semiconductor multiple quantum wells of the active region,where the refractive index in the region is proportional to the light intensity,i.e.n=n_(2)I,where n is the refractive index of the material,I is the incident light intensity,and n_(2)is the Kerr coefficient.For the semiconductor multiple quantum wells materials,the above n_(2)is negative.The nonlinear Kerr effect in the active region leads to an equivalent lens depending on the intensity of light,causing the pulsed laser to experience a higher refractive index,while the continuous-wave laser suffers to a lower refractive index.When there is an aperture in the resonant cavity or a so-called soft aperture composed of pump spot on the gain chip,the equivalent lens mentioned above will cause the pulsed laser to experience less loss in the resonant cavity,start the pulse operation of the laser,and maintain stable pulse train output.If the effect of the Kerr equivalent lens is weak,SDL will operate in a Q-switching state,producing Q-switching pulse train with a pulse width on the or

关 键 词：自调Q 半导体碟片激光器 倍频 水下无线光通信 

分 类 号：TN29[电子电信—物理电子学]