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

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

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%.

Keywords: focusing polarization laser beam

Received: 02 March 2011
Revised: 16 June 2011
Accepted manuscript online:

PACS:	42.60.Jf	(Beam characteristics: profile, intensity, and power; spatial pattern formation)
	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	42.25.Ja	(Polarization)
	42.30.Lr	(Modulation and optical transfer functions)

Fund: 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).

Cite this article:

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 2011 Chin. Phys. B 20 114211

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

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