光学焦散线的任意无衍射结构光场调控  

Manipulation of Non-Diffracting Beams with Arbitrary Structures Based on Optical Caustics

作　　者：兰燕平 胡俊涛 孙卓 王逸舒 叶文妮 钱义先[1,2] Lan Yanping;Hu Juntao;Sun Zhuo;Wang Yishu;Ye Wenni;Qian Yixian(College of Physics and Electronic Information Engineering,Zhejiang Normal University,Jinhua 321004,Zhejiang,China;Key Laboratory of Researching Optical Information Detecting and Display Technology in Zhejiang Province,Jinhua 321004,Zhejiang,China)

机构地区：[1]浙江师范大学物理与电子信息工程学院,浙江金华321004 [2]浙江省光信息检测与显示技术重点实验室,浙江金华321004

出　　处：《光学学报》2023年第13期253-260,共8页Acta Optica Sinica

基　　金：国家自然科学基金(11974314);浙江省自然科学基金重点项目(LXZ22A040001);金华市科技局重点项目(20211043)。

摘　　要：从几何光学焦散角度,利用谱相位调制原理,提出一种通用且高效的无衍射结构光场调控方法。利用驻相近似和焦散线原理建立了谱相位与光束横截面分布轨迹之间的数学模型。提出一种谱相位叠加的改进算法,实现构建任意结构的无衍射光束,理论模拟和实验结果相吻合。与现有方法相比,本文方法能够实现对无衍射光场形状分布的灵活调控,其丰富的结构及无衍射特性将极大地拓展其在光学微加工及微操纵等领域的应用。Objective Structured light beams with controllable intensity distribution have received great interest recently.Many newtype beams exhibit unique physical properties including diffraction-free,self-bending,orbital-angular-momentum-carrying,and abruptly autofocusing.Particularly,non-diffracting beams can retain their intensities and shapes during propagation and have been widely used in laser micromachining,particle manipulation,and microscopic imaging.The first type of nondiffracting beam is the Bessel beam,which was first discovered by Durnin in 1987.It is a wave packet solution expressed as a Bessel function and derived from the Helmholtz equation in a cylindrical coordinate system.Additionally,Bessel beams have a doughnut-shaped intensity distribution and phase singularity at their center and also exhibit many unique optical properties.Most non-diffracting beams are associated with the known,exact solutions of the wave equation and match with special forms of the angular spectrum.It is the angular spectrum that determines the beam propagation dynamics,as well as the intensity profiles.To achieve diverse transverse shapes of non-diffracting beams,a traditional method is to solve the wave equation under different coordinates.For example,the cosine beam,the Mathieu beam,and the Weber beam were obtained by solving a wave equation in a rectangular coordinate system,an elliptic coordinate system,and a parabolic coordinate system,respectively.Later,more non-diffracting beams were constructed by superimposing the basic fundamental non-diffracting beams.Recently,the typical accelerating Airy beam also exhibits unique non-diffracting characteristics as well as self-acceleration and self-healing.However,current methods are limited to producing only a limited non-diffracting structured light beam,which greatly restricts their applications.Consequently,it is imperative to create a greater variety of non-diffracting beams with diverse transverse intensity distributions so that the capabilities of non-diffracting structured

关 键 词：物理光学 无衍射光束 光学焦散线 相位调制 

分 类 号：O436[机械工程—光学工程]