全固态连续单频455nm蓝光钛宝石激光器  

All-solid-state Continuous Wave Single-Frequency 455nm Blue Ti:Sapphire Laser

作　　者：秦玮霞 李凤琴[1,2] QIN Wei-xia;LI Feng-qin(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,山西太原030006 [2]山西大学,极端光学协同创新中心,山西太原030006

出　　处：《量子光学学报》2022年第2期180-186,共7页Journal of Quantum Optics

基　　金：国家自然科学基金面上项目(61975100)。

摘　　要：全固态连续单频455 nm蓝色激光与铯原子高能态跃迁吸收线6^(2)S_(1/2)←→7^(2)P_(3/2)相匹配,是发展远距离水下量子通讯的重要光源。且455 nm激光还对应于钡离子138Ba^(2+)的跃迁能级6S_(1/2)←→6P_(3/2),应用于量子计算领域,有利于减小量子计算及精密测量的系统误差。本文设计了内腔倍频式全固态高功率连续单频455 nm蓝光钛宝石激光器,优化了激光器谐振腔结构与激光振荡阈值,采用准相位匹配的Mg O:PPSLT晶体作为内腔倍频器,当绿光泵浦功率为11.5 W时,获得了最高输出功率为427 m W的单频455 nm蓝色激光,光光转换效率为3.7%,蓝光光束质量M^(2)因子优于1.18。Continuous-wave (CW) single-frequency coherent laser sources in the blue spectral region are useful for applications in biomedicine,metrology,display technology,atomic-trapping,quantum optics,and so on owing to their intrinsic merits of lowintensity noise,narrow linewidth as well as the good beam quality.The single-frequency 455 nm laser is in the band of blue-green(400~500 nm) optically transparent window of seawater,and seawater has very little photon absorption and low transmission loss.Moreover,the wavelength of 455 nm is just corresponding to the higher state excitation transition 6^(2)S_(1/2)←→7^(2)P_(3/2)of Cs atoms,which can be used for the development of long-distance underwater quantum communication based on quantum storage nodes which can be used for the development of long-distance underwater quantum communication based on quantum storage nodes of the cesium atom system.It also corresponds to the transition 6S_(1/2)←→6P_(3/2) of138Ba^(2+),which can be used in the field of quantum computing to reduce systematic errors.In this paper,the continuous wave single-frequency 455 nm laser generation from intracavity frequency-doubled Ti:S laser is presented.By optimizing the curvature radii of the resonator mirrors,the beam waist of the fundamental wave at the Ti:S crystal is focused,and the threshold pump power is effectively decreased.When a quasi-phase matched Mg O:PPSLT crystal is used as the intracavity frequency doubler,the highest output power of 427 m W at 455 nm is attained under the pump power of 11.5 W with an optical conversion efficiency of 3.7%.The measured blue laser beam quality is better than 1.18.

关 键 词：水下量子通讯 455nm蓝光钛宝石激光器 单频 

分 类 号：TN248[电子电信—物理电子学]