Mr. Bosong Yu Profile

Bosong Yu

at Huaqiao Univ

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SPIE Journal Paper | 30 January 2019

Comparative study on the paraxial approximation errors of tightly focused fundamental Gaussian beams

Bosong Yu, Zhili Lin, Jixiong Pu

OE, Vol. 58, Issue 01, 016117, (January 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.1.016117

KEYWORDS: Paraxial approximations, Gaussian beams, Optical engineering, Plutonium, Error analysis, Laser beam propagation, Wave propagation, Near field optics, Laser cutting, Free space

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When the beam waist size is on the order of or smaller than a wavelength, the traditional Gaussian solution exhibits noticeable errors in describing a tightly focused laser beam of the fundamental mode. The spatial distributions of the paraxial approximate errors of the Gaussian solution to the paraxial Helmholtz equation, as compared with Sapozhnikov’s exact solution to the scalar Helmholtz equation, are illustrated, tabulated, and discussed systematically. The maximum and average errors of the Gaussian solution are presented for a list of different specified waist sizes of laser beams. We found that the maximum error distribution is of an annular structure and contains the largest error ring on the waist plane. The laser beam waist should be >1.2 wavelengths for a 1% error, while the beam waist should be >3.5 wavelengths for a 0.1% error. This study provides a useful criterion to ascertain whether the traditional Gaussian solution or the exact solution is to be used to describe the fundamental laser beam in optical engineering. The results exhibit potential applications in micronano technology, near-field optical technology, and other fields where tightly focused laser beams are utilized.

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