基于单共振光学参量振荡器实现近红外到中红外激光输出的实验研究  

Experimental Study of Near-Infrared to Mid-Infrared Laser Output Based on Single Resonant Optical Parametric Oscillator

作　　者：王海龙 杨慧琦 苏静[1,2] 卢华东 Wang Hailong;Yang Huiqi;Su Jing;Lu Huadong(State Key Laboratory of Quantum Optics and Quantum Optics Derices.hustitute of Opto-Electronics,Shauxi Uniuerity,Taiywan 030006,Shanxi,China;Collaborutice Hunooation Center of Extreme Opties,Shouri Uninersity,Taipuan 030006,Shonxi,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：《中国激光》2022年第18期21-29,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(61975100,62027821,62105192);山西省1331工程项目;山西省高等学校中青年拔尖创新人才支持计划。

摘　　要：利用结构紧凑的四镜环形单共振光学参量振荡器(SRO)实现了从近红外到中红外的瓦级单频激光输出。通过优化谐振腔腔镜的曲率半径以及谐振腔腔长,设计了双腰斑的四镜环形谐振腔,在两个腰斑处分别放置光学参量振荡晶体MgO∶PPLN和倍频晶体PPKTP。当单频1064 nm泵浦激光的注入功率为21 W时,得到了2.1 W的1550 nm信号光、1.1 W的775 nm倍频光以及1.7 W的3393 nm闲频激光输出,总光光转换效率为23.3%,5 h内信号光、倍频光、闲频光的功率稳定性(均方根)分别优于2.5%、1.6%、0.8%。本团队研制的单频连续波激光器可以应用于包括压缩态光场和纠缠态光场等非经典光场制备的实验中。Objective Due to its small construction,low-intensity noise,and narrow linewidth,all-solid-state continuous-wave(CW)single-frequency lasers have been widely employed in scientific research,military,and medical applications.The emission wavelengths of lasers can be confined to many particular ranges due to the constraints of the fluorescence spectra of laser crystals,which cannot match the demands of rapidly increasing scientific research.As an effective laser wavelength conversion technology,the nonlinear frequency conversion process including optical parametric oscillation(OPO),sum frequency(SF),different frequency(DF),etc.,provides multi-watt CW output powers in the deep-ultraviolet(DUV)to mid-infrared and further expands the applied field of lasers.The single-frequency 1550 nm laser is frequently utilized in the formation of quantum squeezed and entangled states because its wavelength matches the low dispersion and low loss window of fibers,allowing for long-distance and steady laser transmission through the fiber.At present,there are several methods to generate a 1550 nm laser.Firstly,the 1550 nm laser is produced by a laser crystal co-doped with ytterbium-erbium(Yb^(3+),Er^(3+))directly pumped by a 976 nm semiconductor laser.The low cost,small construction,and ease of downsizing draw a lot of interest,however,the gain crystal’s intrinsic excited state absorption restricts the laser output power.Secondly,the 1550 nm laser is also produced by an erbium(Er^(3+))-doped fiber laser.The erbium-doped fiber laser’s waveguide structure is advantageous for achieving high-power output,although the output laser’s noise is rather high.In comparison to the previous approaches,the OPO process combines the benefits of low noise,small line width,and high stability to make the single-frequency 1550 nm laser the ideal contender.Especially,when we would like to generate the 1550 nm squeezed and entangled states,it is needed to use 775 nm and 1550 nm lasers as the pump and signal lasers of the optical parametric amplifier(

关 键 词：激光 单共振光学参量振荡器 倍频 四镜环形腔 单频 热透镜效应 

分 类 号：TN248.1[电子电信—物理电子学]