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光致折射率微小变化的观测方法

Observation Method of Slight Changes of Light Induced Refractive Index

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摘要

光折变晶体内部产生的光致折射率的变化很小, 不易实时观测, 导致对写入晶格的质量无法鉴定。为了实时观测光折变光子晶格写入导致的更细微的光致折射率的时间和空间的变化, 提出了在马赫-曾德尔光路的基础上引入放大的傅里叶变换的观测方法, 极大地提高了测量的分辨率。该方法可以实时观测写入高密度光子晶格折射率的时间和空间变化, 同时可以鉴定光子晶格的质量和均匀度, 解决了高密度光子晶格制作质量的时间把控问题。与间接方法相比, 该方法更加直观明了, 所测数据更加准确、清晰, 分辨率可方便地由傅里叶变换透镜的组合决定。

Abstract

The photorefractive index generated inside the photorefractive crystal has a very small change and is not easy observed in real time, resulting in the failure to characterize the quality of the writing lattices.In order to observe the temporal and spatial variation of the photorefractive index caused by the writing of photorefractive photonic lattice, we propose amplified Fourier transform method based on Mach-Zehnder optical path. The resolution of the measurement is greatly improved. This method can observe the time and space changes of refractive index of high density photonic lattice in real time, at the same time, it can identify the quality and uniformity of photonic lattice, and solve the time control problem of high density photonic lattice fabrication quality. Compared with the indirect method, the proposed method is more straightforward, the measured data is more accurate and clear, and the resolution can be easily determined by the combination of Fourier transform lens.

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中图分类号:O437

DOI:10.3788/lop55.061902

所属栏目:非线性光学

基金项目:国家自然科学基金(60467002)、内蒙古自然科学基金(2013MS0926)

收稿日期:2017-11-06

修改稿日期:2017-12-19

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吴泽军:内蒙古师范大学物理与电子信息学院, 内蒙古 呼和浩特 010022
杨立森:内蒙古师范大学物理与电子信息学院, 内蒙古 呼和浩特 010022

联系人作者:吴泽军(1446783116@qq.com)

备注:吴泽军(1991-), 男, 硕士研究生, 主要从事光折变非线性光学方面的研究。E-mail: 1446783116@qq.com

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引用该论文

Wu Zejun,Yang Lisen. Observation Method of Slight Changes of Light Induced Refractive Index[J]. Laser & Optoelectronics Progress, 2018, 55(6): 061902

吴泽军,杨立森. 光致折射率微小变化的观测方法[J]. 激光与光电子学进展, 2018, 55(6): 061902

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