Abstract
We propose a quasi-parabolic mirror that can produce a long needle of light by focusing a radially polarized annular beam. The quasi-parabolic mirror can be acquired by moving the axis of rotation of a parabolic mirror. Using the extended Richards–Wolf theory for axisymmetric surfaces, we calculated that the needle obtained can have a longitudinal FWHM over hundreds to thousands of wavelengths by keeping the transverse FWHM under . The consistent expression of the approximate relationship between the angular thickness of the incident beam and the longitudinal FWHM based on both geometrical optics and wave optics is presented.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Li Hang, Kai Luo, Jian Fu, Yizhe Chang, Ying Wang, and Peifeng Chen
Appl. Opt. 57(9) 2069-2072 (2018)
Harold Dehez, Alexandre April, and Michel Piché
Opt. Express 20(14) 14891-14905 (2012)
D. Panneton, G. St-Onge, M. Piché, and S. Thibault
Opt. Lett. 40(3) 419-422 (2015)