Reduction of the spot size by using a radially polarized laser beam

Susanne Quabis; Ralf Dorn; O. Gloeckl; M. Reichle; Manfred Eberler

doi:10.1117/12.428336

30 May 2001 Reduction of the spot size by using a radially polarized laser beam

Susanne Quabis, Ralf Dorn, O. Gloeckl, M. Reichle, Manfred Eberler

Proceedings Volume 4429, International Seminar on Novel Trends in Nonlinear Laser Spectroscopy and High-Precision Measurements in Optics; (2001) https://doi.org/10.1117/12.428336
Event: International Seminar on Novel Trends in Nonlinear Laser Spectroscopy and High-Precision Measurements in Optics, 2000, Vladimir/Suzdal, Russian Federation

Abstract

We present numerical calculations on the field distribution in the focus of an optical system with high numerical aperture. It is shown that a radially polarized doughnut mode fits the symmetry of the optical system and focuses down to spot sizes significantly smaller as compared to the case of linear polarization. An experimental setup to generate a radially polarized beam is presented along with a setup which is based on the knife edge method and tomographic reconstruction to measure the 3D intensity distribution in the focal region.

Citation Download Citation

Susanne Quabis, Ralf Dorn, O. Gloeckl, M. Reichle, and Manfred Eberler "Reduction of the spot size by using a radially polarized laser beam", Proc. SPIE 4429, International Seminar on Novel Trends in Nonlinear Laser Spectroscopy and High-Precision Measurements in Optics, (30 May 2001); https://doi.org/10.1117/12.428336

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