中红外全固态柱矢量激光器  

Mid-Infrared All-Solid-State Cylindrical Vector Laser

作　　者：鲍玉朔 麻向坤 张春香 王振洪 马瑞 刘军[1] 徐世祥[4] 范滇元[1] Bao Yushuo;Ma Xiangkun;Zhang Chunxiang;Wang Zhenhong;Ma Rui;Liu Jun;Xu Shixiang;Fan Dianyuan(Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,Guangdong,China;College of Engineering Physics,Shenzhen Technology University,Shenzhen 518118,Guangdong,China;College of Electronics and Information Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China;College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China)

机构地区：[1]深圳大学微纳光电子学研究院,广东深圳518060 [2]深圳技术大学工程物理学院,广东深圳518118 [3]深圳大学电子信息与工程学院,广东深圳518060 [4]深圳大学物理与光电工程学院,广东深圳518060

出　　处：《中国激光》2025年第2期27-34,共8页Chinese Journal of Lasers

基　　金：广东省自然科学基金(2021A1515011532,2023ZDZX3022,2024A1515012152);深圳市科创委基金(JCYJ20220818100019040,RCYX20210609103157071,JCYJ20200109105606426,JCYJ20230808105713028)。

摘　　要：中红外波段柱矢量激光器在材料加工、粒子捕获、光学显微和存储等领域中具有广阔的应用前景。将飞秒激光刻写的自组织纳米结构光栅(S波片)作为偏振模式转换器件应用于全固态Er∶YAP激光器,实现了连续波和短脉冲可切换的中红外柱矢量激光高效输出,其中径向和角向偏振模式可快速切换。在连续波运转模式下获得了平均功率分别为136 mW和133 mW的径向偏振及角向偏振柱矢量激光输出,波长均为2.73μm;基于光学斩波器实现了稳定的调Q脉冲柱矢量激光输出,最窄脉宽为124.73 ns,对应脉冲能量为13.84μJ。这些研究结果为中红外结构光激光器的设计及实现提供了有益的参考。Objective Mid-infrared cylindrical vector beams have important applications in laser material processing,particle trapping,microscopy,and information storage.Common methods for the direct generation of these cylindrical vector beams in a solid-state laser are mainly based on the thermal birefringence effect of the gain medium,off-axis pumping regime,and polarization mode conversion element of the Q-plate.However,these typical generation methods have many intrinsic disadvantages,including poor stability,low lasing efficiency,and low output power.In contrast,a mid-infrared S-waveplate,which is a self-organized nanostructured grating that is inscribed in fused silica glass using a femtosecond laser,is an efficient mode-conversion element that can handle high power densities.We achieve high-power and stable mid-infrared cylindrical vector beams by incorporating this advantageous component into a mid-infrared Er∶YAP laser.In this study,highly efficient mid-infrared cylindrical vector beams are directly generated based on an Swaveplate acting as an intra-cavity polarization mode conversion device in an all-solid-state Er∶YAP laser.Radially and azimuthally polarized lasers can be easily fabricated and switched.In the continuous-wave operation mode,maximum average output powers of 136 mW and 133 mW are obtained for the radially and azimuthally polarized laser beams,respectively.Using an optical chopper,Qswitched pulsed cylindrical vector laser beams are also achieved,with the shortest pulse width being 124.73 ns and the single pulse energy being 13.84μJ.These results provide insight into the structural design and experimental realization of mid-infrared structured lasers.Methods The experimental schematic of the mid-infrared all-solid-state cylindrical vector laser is shown in Fig.1.The pump source was a fiber-coupled laser diode with a maximum pump power of 27 W.The center wavelength was locked at 976 nm with a spectral linewidth of less than 0.7 nm.The core diameter and its numerical aperture of the pig-tailed fib

关 键 词：中红外波段 柱矢量光 径向偏振光 角向偏振光 S波片 光学斩波器 

分 类 号：TN248.1[电子电信—物理电子学]