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Focal shift of flattened Gaussian beams passing through a spherically aberrated lens

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Abstract:

Starting from the Collins formula, the focal shift of flattened Gaussian beams (FGBs) passing through a spherically aberrated lens is studied in detail. It is found that for FGBs the focusing without focal shift, inverse focal shift and beyond conventional diffraction limit can be achieved by a suitable choice of the Fresnal number N w , spherical aberration kS 1, and beam order N.

Keywords: Focal shift; flattened Gaussian beam (FGB); spherical aberration

Document Type: Original Article

DOI: https://doi.org/10.1078/0030-4026-00151

Affiliations: 1: College of Electronic Engineering, Sichuan Normal University, Chengdu 610066, China 2: Institute of Laser Physics & Chemistry, Sichuan University, Chengdu 610064, China

Publication date: 2002-08-01

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