偏振方向对涡旋光束产生的影响

黄石明; 聂建业; 张蓉竹

doi:10.11884/HPLPB201830.170404

偏振方向对涡旋光束产生的影响

doi: 10.11884/HPLPB201830.170404

四川大学电子信息学院，成都 610064

详细信息

作者简介:
黄石明(1993－), 男，硕士，从事涡旋光束产生及传输方面的研究; Huang_sm93@126.com

通讯作者:
张蓉竹(1975－), 女，教授，从事激光与光电子技术方面的研究; zhang_rz@scu.edu.cn

中图分类号: TN241;TN249
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出版历程
- 收稿日期: 2017-10-19
- 修回日期: 2018-03-04
- 刊出日期: 2018-07-15

Influence ofpolarization direction on Vortex beam

School of Electronics Information Engineeing, Sichuan University, Chengdu 610064, China

摘要

摘要: 在利用液晶空间光调制器(LCSLM)产生涡旋光束时，入射光的偏振方向对涡旋的产生有着明显的影响。从液晶空间光调制器的工作原理出发，研究了不同偏振方向的线偏振光在通过LCSLM的相位调制后，涡旋光束产生的变化。通过模拟仿真与实验结果的比较，发现随着线偏振光的偏振方向与液晶分子光轴夹角的增大，液晶空间光调制器的调制误差变大，所产生的涡旋光束的质量变差。当夹角大于4.725°时，涡旋光束的质量明显变差。而随着夹角继续增大，LCSLM对入射光的调制作用减弱，无法产生涡旋光束。
- 涡旋光束 /
- 偏振方向 /
- 空间光调制器 /
- 液晶
Abstract: When a vortex beam is generated by liquid crystal spatial light modulator (LCSLM), the polarization direction of the incident light has a significant effect on generating the vortex. Based on the physical principle of the spatial light modulator, the influence of the polarization directions of the incident light on the output beam is calculated and analyzed, and the calculation is compared with the experimental results. The results show that, the modulation error of the LCSLM increases with the angle between the polarization direction of the incident light and the optical axis of the liquid crystal molecule, and the quality of vortex beam is worse. In particular, the quality of the vortex beam is significantly worse when the angle of the angle is greater than 4.725°. As the angle continues to increase, the modulation effect of LCSLM on the incident light is weakened, and the vortex beam can not be generated.
- vortex beam /
- polarization direction /
- spatial light modulator /
- liquid crystal

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图 1 LCSLM的调制原理

Figure 1. Modulation principle of liquid crystal spatial light modulator (LCSLM)

下载: 全尺寸图片幻灯片

图 2 不同偏振方向入射时涡旋光束的光强分布变化

Figure 2. Changes of light intensity distribution of vortex beam in different polarization direction

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图 3 不同偏振方向入射时涡旋光束的光强二维分布变化

Figure 3. Two - dimensional distribution of intensity of swirl beam in different polarization direction

下载: 全尺寸图片幻灯片

图 4 高斯光束产生涡旋示意图

Figure 4. The illustration of generating a vortex by Gaussian beam

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图 5 不同偏振方向的光强实验结果

Figure 5. Experimental results of light intensity in different polarization directions

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图 6 不同偏振方向的光强二维分布图

Figure 6. Two-dimensional distribution diagram of light intensity in different polarization directions

下载: 全尺寸图片幻灯片

表 1 偏角α与η的对应关系

Table 1. The corresponding relationship between the angle α and η

α/(°)	η/%	α/(°)	η/%
0	0	4	3.6
1	0.23	4.725	5.01
2	0.9	5	5.6
3	2.02

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