准连续c切Er,Yb:YAl_(3)(BO_(3))_(4)激光器的偏振操控  

Polarization manipulation in a quasi-continuous c-cut Er,Yb:YAl_(3)(BO_(3))_(4) laser

作　　者：佘凯 谢鹏建 周鹏斐 魏勇 许珊 李丙轩[2,7] 张戈 She Kai;Xie Pengjian;Zhou Pengfei;Wei Yong;Xu Shan;Li Bingxuan;Zhang Ge(College of Chemistry,Fuzhou University,Fuzhou 350108,China;Key Laboratory of Optoelectronic Materials Chemistry and Physics,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;Fujian College,University of Chinese Academy of Sciences,Fuzhou 350002,China;College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350117,China;School of Physics and Electronic Science,Hunan Institute of Science and Technology,Yueyang 414006,China;Hubei Key Laboratory of Low Dimensional Optoelectronic Material and Devices,Hubei University of Arts and Science,Xiangyang 441053,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China)

机构地区：[1]福州大学化学学院,福建福州350108 [2]中国科学院福建物质结构研究所光电材料化学与物理重点实验室,福建福州350002 [3]中国科学院大学福建学院,福建福州350002 [4]福建师范大学化学与材料学院,福建福州350117 [5]湖南理工学院物理与电子科学学院,湖南岳阳414006 [6]湖北文理学院低维光电材料与器件湖北省重点实验室,湖北襄阳441053 [7]福建省光电信息科技创新实验室,福建福州350108

出　　处：《红外与激光工程》2024年第4期58-66,共9页Infrared and Laser Engineering

基　　金：中国科学院青年创新促进会项目(2022303);中国科学院技术支撑人才专项(2022000061);中国科学院科研仪器设备研制项目(YZLY202001);国家自然科学基金项目(U21A20508,61975208,62105334);中国福建光电信息科学与技术创新实验室项目(2021ZR203,2020ZZ108,2021ZZ118);湖南省教育厅项目(22A0476);福建省自然科学基金项目(2021H0047)。

摘　　要：通过构建谐振腔模型,分析了各向同性固体激光器中两个本征模式相干叠加后的光斑奇异特征。并且实验验证了在不使用任何特定的腔内光学偏振选择元件的情况下,在二极管泵浦的准连续c切Er,Yb:YAl_(3)(BO_(3))_(4)激光器中可以有效操控1.6μm输出激光的偏振态。实现了从部分偏振态转化成稳定的线偏振态,其线偏振方向为可切换的正交特殊情况,均具有21 dB的偏振消光比。同时通过光斑对比,验证了激光器的线偏振输出来源于两个正交本征模式的相干叠加。文中为c切Er,Yb:YAl_(3)(BO_(3))_(4)激光器线偏振光的直接输出与偏振态的调控提供了可靠的方案。Objective By constructing a resonant cavity model,the theoretical calculations reveal the spot singularity feature after coherent superposition of two intrinsic modes in an isotropic solid-state laser.And it is experimentally verified for the first time that the polarization state of the 1.6μm output laser can be effectively manipulated in diode-pumped quasi-continuous c-cut Er,Yb:YAl_(3)(BO_(3))_(4) lasers without using any specific intracavity optical polarization selector element.The transformation from a partially polarized state to a stable line-polarized state with a switchable orthogonal special case of line polarization direction is achieved,all with a polarization extinction ratio of 21 dB.It is also verified that the line-polarized output of the laser originates from the coherent superposition of two orthogonal eigenmodes by spot comparison.This thesis provides a reliable scheme for the direct output of line-polarized light from c-cut Er,Yb:YAl_(3)(BO_(3))_(4) lasers with the modulation of polarization states.Methods The resonant cavity model is shown(Fig.1),whereθis denoted as the angle between the coordinate systems of the intracavity loss anisotropy∆φand the phase anisotropy∆t.The experimental principle diagram of the c-cut Er,Yb:YAl_(3)(BO_(3))_(4) polarization controlled laser is shown(Fig.3).The laser cavity has a length of approximately 32 mm,and the laser crystal is mounted on a water-cooled copper heat sink at 288.1 K.The output laser beam is split into two paths using a beam splitter(Splitter).In one of these paths,a Glan-Laser prism is employed as a polarizer,and a laser power meter(Thorlabs,Inc.)is used to measure the laser power after passing through the polarizer.Both measurements are utilized to determine the polarization state of the laser output.The other output laser uses an infrared camera and a spectrometer to detect the beam quality and emission wavelength of the output laser with different polarization states.In the experiment,by re-aligning the resonator,the output coupling

关 键 词：固体激光器 偏振调控 c切Er Yb:YAl_(3)(BO_(3))_(4) 准连续泵浦 光束轮廓 

分 类 号：TN248.1[电子电信—物理电子学]