激光刻写三维全息图产生涡旋倍频的实验和理论研究
投稿时间:2020-04-11  修订日期:2020-05-12  点此下载全文
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作者单位E-mail
陈鑫 西安电子科技大学 xin.chen@xidian.edu.cn 
尹恒 西安电子科技大学  
刘山 澳大利亚国立大学  
王军利 西安电子科技大学 wangjunli@mail.xidian.edu.cn 
盛艳 澳大利亚国立大学 yan.sheng@anu.edu.au 
魏志义 中国科学院物理研究所  
Wieslaw Krolikowski 澳大利亚国立大学  
基金项目:国家自然科学基金青年科学基金项目;中央高校基本科研业务费项目
中文摘要: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。
中文关键词:体相位全息图  飞秒激光直写  光束整形  频率变换
 
Experimental and theoretical research on second harmonic optical vortex generated by laser inscribed 3D holograms
Abstract: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.
keywords:Volume phase hologram, femtosecond laser direct writing, beam shaping, frequency conversion
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