微片Nd∶YAG涡旋光激光器研究  

Thin-Disk Nd∶YAG Vortex Laser

作　　者：连天虹[1] 杨磊 朱家华 刘健宁[1] 邢俊红[1] 刘芸[1] 焦明星[1] Lian Tianhong;Yang Lei;Zhu Jiahua;Liu Jianning;Xing Junhong;Liu Yun;Jiao(Mingxing School of Mechanical and Precision Instrument Engineering,Xi′an University of Technology,Xi′an 710048,Shaanxi,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,陕西西安710048

出　　处：《光学学报》2022年第21期174-182,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61805196,51875455,62075180)。

摘　　要：在涡旋光激光器中,同阶次的两个相反手性模式通常呈现叠加输出。建立了同阶次相反手性模式的部分相干叠加模型,实验研究了在连续和被动调Q运行下相反手性模式的叠加特性。在低功率泵浦下,连续运行时两个手性的模式相干叠加形成花瓣状光斑,两个模式的初相位差决定了花瓣光斑节线的方向,而调Q运行时花瓣节线的方向随脉冲序列随机变化。在高功率泵浦下,相反手性模式形成非相干叠加,此时光斑虽然为圆环状,但是光束不具有涡旋相位,这是模式激烈竞争下相位的随机变化导致的。通过倾斜输出镜和被动调Q对手性进行控制,产生了功率分别为0.88、0.85、0.79 W的LG_(0,±1)模、LG_(0,±2)模、LG_(0,±3)模连续涡旋光束和重复频率为12.6 kHz、脉冲宽度为28.6 ns、峰值功率为1.33 kW的LG_(0,±1)脉冲涡旋光束。In vortex lasers,two modes with the same order but opposite chirality will be superposed in output.Therefore,we build a partially coherent superposition model for the two modes with opposite chirality and the same order,and investigate the superposition characteristics of the modes under continuous and passively Qswitched operation separately through experiments.Under a lowpower pump,the modes coherently superpose to form petallike light spots with the orientation determined by the initial phase difference under continuous operation.However,under Qswitched operation,the orientation of the petallike light spots changes randomly with the pulse train.Under a highpower pump,the two modes superpose incoherently and present ringshaped light spots without vortex phases,which is due to the random phase fluctuation caused by fierce mode competition.The mode chirality can be controlled by the tilted output mirror and the passive Qswitch to generate continuous vortex beams for the LG_(0,±1) modes,LG_(0,±2) modes,and LG_(0,±3 )modes with the power of 0.88 W,0.85 W,and 0.79 W,respectively,and LG_(0,±1) pulse vortex beam with a repetition rate of 12.6 kHz,a pulse width of 28.6 ns,and a peak power of 1.33 kW.

关 键 词：激光器 固体激光器 涡旋光 模式叠加 手性控制 

分 类 号：TN248.1[电子电信—物理电子学]