在Talbot效应下,Laguerre-Gaussian光束转换为Hermite-Gaussian模式的1D数组
Optics express
|June 29, 2023
概括
来自周期结构的拉盖尔-高斯 (LG) 束的衍射将它们转化为赫尔米特-高斯 (HG) 模式. 在Talbot平面上观察到的这种现象,允许确定LG光束属性.
科学领域:
- 波浪光学是一种波浪光学.
- 量子光学就是量子光学.
- 光束传播的传递.
背景情况:
- 拉盖尔-高斯 (Laguerre-Gaussian,LG) 波束是对轴波光学中的基本解决方案.
- 具有非零辐射指数的LG光束的特征可能是具有挑战性的.
- 塔尔博特效应描述了在连贯照明下周期结构的自我成像.
研究的目的:
- 理论上制定和实验证明LG光束的转化为赫尔密特-高斯 (HG) 模式.
- 调查格子参数和塔尔博特平面对这种转换的影响.
- 建立一种方法来确定LG光束的拓电荷和辐射指数.
主要方法:
- 从1D周期结构中开发LG光束衍射的一般理论框架.
- 使用自由空间转移函数和快速里埃变换 (FFT) 的数值模拟.
- 预测的衍射和模式转换现象的实验验证.
主要成果:
- 具有非零辐射指数的LG光束在Talbot平面上转换为HG模式,特别是第一个Talbot图像.
- 二元格的开放比率 (OR) 显著影响生成的HG模式阵列的质量.
- 撞击LG光束的拓电荷 (TC) 和辐射指数可以从得到的HG模式模式中准确地确定.
结论:
- 塔尔博特效应提供了一种新的方法来表征具有非零辐射指数的LG光束.
- 将LG光束转化为HG模式的1D阵列是一个强大的现象.
- 这种效应在波物理学中具有潜在的应用,特别是对于长波长的波.
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