中红外涡旋激光在有机晶体DSTMS中的演化(特邀)  

Evolution of Mid-Infrared Vortex Laser in Organic Crystal DSTMS(Invited)

作　　者：林婷 孟宪泽 郑卓锐 丁营营 宋立伟[2] 刘一 田野[2] Lin Ting;Meng Xianze;Zheng Zhuorui;Ding Yingying;Song Liwei;Liu Yi;Tian Ye(College of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室,上海201800

出　　处：《光学学报》2024年第10期307-313,共7页Acta Optica Sinica

基　　金：国家重点研发计划(2022YFA1604401);国家自然科学基金(12325409,62105346,12388102);上海市基础研究特区项目-中国科学院上海分院。

摘　　要：具有轨道角动量的涡旋光束相比其他光束有很多独特的性质,其螺旋状的波前结构和相位变化为诸多应用开辟了新的维度。对涡旋光在非线性有机晶体DSTMS中的传输演化机制进行实验研究,探索了涡旋中红外激光的非线性传输特性,利用广义高斯光束分解方法模拟分析了拉盖尔-高斯光束经过介质前后的光强分布,并对比了不同入射涡旋光的偏振态对出射光斑的影响的差异。Objective Vortex beams with orbital angular momentum(OAM)have many unique properties compared to other beams,and their spiral wavefront structure and phase changes open up new dimensions for applications such as lithography,optical communication,optical trapping,and quantum entanglement.In recent decades,researchers have been exploring the linear and nonlinear transmission of the Laguerre-Gaussian(LG)vortex beam in media,and the coverage has been continuously expanded,which lays a solid foundation for developing the optical vortex.Most relevant research focuses on analyzing the properties of vortex beams and their linear transmission and evolution.However,the ultrashort pulse vortex laser has become a research hotspot with extensive studies.Since the inclusion of nonlinear processes will greatly increase the complexity of vortex beam analysis,the study on transmission and evolution of ultrashort pulse vortex lasers in nonlinear media is still rare.Thus,we experimentally investigate the propagation of mid-infrared LG beams in organic crystal DSTMS due to the cubic-quintic nonlinear effect and analyze the differences in the effect of polarization of the incident vortex beam on the transverse light field distribution.Methods High power mid-infrared optical parametric amplifier(OPA)pulses with 1450 nm center wavelength,60 fs pulse duration,and 1 kHz repetition rate serve as the pump of the system.After passing through a customized spiral phase plate(SPP),the mid-infrared laser light is modulated into vortex beams and incident perpendicularly onto the surface of an organic crystal with a 640μm thickness.A 4f imaging system is constructed using two lenses to conduct imaging on the spot in either plane perpendicular to the light propagation direction within the crystal.The CCD camera moves back and forth in the horizontal direction to observe and record the spot evolution of the vortex beam during propagation,starting from the rear surface of the crystal.Results and Discussions In the experiment,the spot changes of mid

关 键 词：物理光学 涡旋光束 五阶非线性 DSTMS晶体 偏振 

分 类 号：O436[机械工程—光学工程]