Far field diffraction patterns of elliptically polarized Gauss beam passing through the nonlinear media

Zhi TAO; Chu-chu PENG; Luo-gen DENG

doi:10.3788/YJYXS20193405.0451

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Far field diffraction patterns of elliptically polarized Gauss beam passing through the nonlinear media

Materials and Devices | 更新时间：2020-07-05

- Far field diffraction patterns of elliptically polarized Gauss beam passing through the nonlinear media
- Chinese Journal of Liquid Crystals and Displays Vol. 34, Issue 5, Pages: 451-458(2019)
- 作者机构：
  
  北京理工大学物理学院, 北京 100081
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20193405.0451
  CLC： O437
- Received：30 December 2018，
  
  Accepted：20 February 2019，
  
  Published：2019-05
- 稿件说明：
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Zhi TAO, Chu-chu PENG, Luo-gen DENG. Far field diffraction patterns of elliptically polarized Gauss beam passing through the nonlinear media[J]. Chinese journal of liquid crystals and displays, 2019, 34(5): 451-458.
DOI：

Zhi TAO, Chu-chu PENG, Luo-gen DENG. Far field diffraction patterns of elliptically polarized Gauss beam passing through the nonlinear media[J]. Chinese journal of liquid crystals and displays, 2019, 34(5): 451-458. DOI： 10.3788/YJYXS20193405.0451.

摘要

以衍射理论为基础，建立了椭偏高斯光束通过非线性介质后远场光强分布的理论模型。利用该理论模型采用数值模拟的方法研究了椭偏高斯光束与非线性介质相互作用后在远场形成的衍射图样随椭偏光椭偏率变化的演化规律。分析发现，在不同非线性机制下，椭偏率的变化对远场衍射图样的影响明显不同。在分子取向机制下，非线性介质对入射椭偏高斯光束椭偏率变化的响应最敏感，不仅影响衍射图样的分布尺寸和衍射环的数目，而且还影响远场衍射图样中央光斑的亮暗。由于线偏振和圆偏振是椭圆偏振的特殊情况，本文所建立的模型也适用于入射光束偏振态为线偏振或圆偏振态的情况。

Abstract

Based on the diffraction theory

a theoretical model of far-field intensity distribution of elliptically polarized Gaussian beam passing through the nonlinear medium was established. Using this theoretical model

the effect of the ellipticity of elliptically polarized Gaussian beam on the evolution of the far-field pattern was studied. The results show that the influence of the ellipticity on far-field diffraction patterns is different for different nonlinear mechanisms. For the molecular reorientation mechanism

the influence of the change of the ellipticity on the far-field pattern is the biggest

which will not only change the diameter of the pattern and the number of diffraction rings

but also change the spot of the pattern from dark to bright (or from bright to dark). In addition

the theoretical model is also applicable to the cases where the polarization state of the incident Gaussian beam is linearly polarized or circularly polarized.

关键词

Keywords

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