激光刻写三维全息图产生涡旋倍频的实验和理论研究  

Experimental and theoretical research on second harmonic optical vortex generated by laser inscribed 3D holograms

作　　者：陈鑫 尹恒 刘山 赵璧君 王军利 盛艳 魏志义[3] Krolikowski Wieslaw CHEN Xin;YIN Heng;LIU Shan;ZHAO Bi-Jun;WANG Jun-Li;SHENG Yan;WEI Zhi-Yi;Krolikowski Wieslaw(School of physics and optoelectronic Engineering,Xidian University,Xi’an 710071,China;Laser Physics Centre,Research School of Physics,Australian National University,Canberra,ACT 2601,Australia;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Science Program,Texas A&M University at Qatar,Doha 23874,Qatar)

机构地区：[1]西安电子科技大学物理与光电工程学院,陕西西安710071 [2]澳大利亚国立大学物理研究学院激光技术中心,堪培拉2601 [3]中国科学院物理研究所北京凝聚态物理国家实验室,北京100190 [4]德克萨斯A&M大学卡塔尔分校科学项目组,多哈23874

出　　处：《红外与毫米波学报》2021年第1期102-107,共6页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金青年科学金(11904273);中央高校基本科研业务费项目(10251180017)。

摘　　要：涡旋光通常需借助外部光学元件或结构将高斯光束整形来产生。激光引发的光致折变结构可以将光束整形功能直写到材料内部,具有便于集成和稳定性好等优点,但这种线性衍射通常无法获得高效的倍频涡旋输出。为解决该问题,首先实验研究了铌酸锂中激光直写参量对光致折变结构分辨率和最大深度的影响,并刻写三维全息图将高斯基频光转换为十字形涡旋倍频;之后理论证明了利用基频的布拉格衍射,可在1.074~3.716μm范围产生相位匹配的涡旋倍频输出。Optical vortex is normally generated via a beam shaping process by irradiating a Gaussian beam through an external optical element or structure.Laser induced photorefractive structures can direct endow beam shaping functions inside materials,which can be stable and easy for the integration of devices.However,this is a method based on linear diffraction and normally cannot obtain efficient second harmonic optical vortex.To solve this problem,firstly,the effects of laser writing parameters on the resolution and maximal depth of photorefractive structures were experimentally investigated in lithium niobite.As a proof of concept,cross-shaped second harmonic vortex beams were obtained by illuminating a fundamental Gaussian beam through a 3D fork hologram.Then it was theoretically demonstrated that phase-matched second harmonic vortex beams can be generated by utilizing the Bragg diffraction of fundamental beam in the wavelength range between 1.074~3.716μm.

关 键 词：体相位全息图 飞秒激光直写 光束整形 频率变换 

分 类 号：O437[机械工程—光学工程] O436.1[理学—物理]