Tight focus of a radially polarized and amplitude- modulated annular multi-Gaussian beam

doi:10.1088/1674-1056/20/11/114211

中国物理B ›› 2011, Vol. 20 ›› Issue (11): 114211-114211.doi: 10.1088/1674-1056/20/11/114211

Tight focus of a radially polarized and amplitude- modulated annular multi-Gaussian beam

王刚¹, 陈建农², 徐钦峰²

(1)School of Electrical and Electronic Engineering, Ludong University, Yantai 264025, China; (2)School of Physics, Ludong University, Yantai 264025, China

收稿日期:2011-03-02 修回日期:2011-06-16 出版日期:2011-11-15 发布日期:2011-11-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11074105), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2010AM038), the Precision Instruments Upgrade Transforming Fund of Shandong Province, China (Grant No. 2010GJC20808-16), and the Research Fund of Education Department of Shandong Province, China (Grant No. J11LA11).

Tight focus of a radially polarized and amplitude- modulated annular multi-Gaussian beam

Chen Jian-Nong(陈建农)^a)†, Xu Qin-Feng(徐钦峰)^a), and Wang Gang(王刚)^b)

^a School of Physics, Ludong University, Yantai 264025, China; ^b School of Electrical and Electronic Engineering, Ludong University, Yantai 264025, China

Received:2011-03-02 Revised:2011-06-16 Online:2011-11-15 Published:2011-11-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11074105), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2010AM038), the Precision Instruments Upgrade Transforming Fund of Shandong Province, China (Grant No. 2010GJC20808-16), and the Research Fund of Education Department of Shandong Province, China (Grant No. J11LA11).

摘要/Abstract

摘要： The focusing of a radially polarized beam without annular apodization ora phase filter at the entrance pupil of the objective results in a wide focus and low purity of the longitudinally polarized component. However, the presence of a physical annular apodization or phase filter makes some applications more difficult or even impossible. We propose a radially polarized and amplitude-modulated annular multi-Gaussian beam mode. Numerical simulation shows that it can be focused into a sharper focal spot of 0.125λ² without additional apodizations or filters. The beam quality describing the purity of longitudinally polarized component is up to 86%.

关键词: focusing, polarization, laser beam

Abstract: The focusing of a radially polarized beam without annular apodization ora phase filter at the entrance pupil of the objective results in a wide focus and low purity of the longitudinally polarized component. However, the presence of a physical annular apodization or phase filter makes some applications more difficult or even impossible. We propose a radially polarized and amplitude-modulated annular multi-Gaussian beam mode. Numerical simulation shows that it can be focused into a sharper focal spot of 0.125$\lambda^2$ without additional apodizations or filters. The beam quality describing the purity of longitudinally polarized component is up to 86%.

Key words: focusing, polarization, laser beam

中图分类号: (Beam characteristics: profile, intensity, and power; spatial pattern formation)

42.60.Jf

41.20.Jb (Electromagnetic wave propagation; radiowave propagation) 42.25.Ja (Polarization) 42.30.Lr (Modulation and optical transfer functions)

陈建农, 徐钦峰, 王刚. Tight focus of a radially polarized and amplitude- modulated annular multi-Gaussian beam[J]. 中国物理B, 2011, 20(11): 114211-114211.

Chen Jian-Nong(陈建农), Xu Qin-Feng(徐钦峰), and Wang Gang(王刚) . Tight focus of a radially polarized and amplitude- modulated annular multi-Gaussian beam[J]. Chin. Phys. B, 2011, 20(11): 114211-114211.

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Tight focus of a radially polarized and amplitude- modulated annular multi-Gaussian beam

Tight focus of a radially polarized and amplitude- modulated annular multi-Gaussian beam

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