M2-factor of high-power laser beams through a multi-apertured ABCD optical system

• 来源期刊: 中国物理B（英文版）
• 关键词: amplitude modulations (AMs) phase fluctuations (PFs) multiple hard-edged aperture beam prop-agation factor
• 年，卷（期）: 2020,（6）
• 页码范围: 219-225
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab81f1

摘要

Based on the generalized truncated second-order moments, an approximate analytical formula of the beam prop-agation factor M2 of high-power laser beams passing through the optical system with multiple hard-edged apertures is deduced. Numerical examples of the beams passing through an aperture-spatial filter are enclosed, and the influences of amplitude modulations (AMs) and phase fluctuations (PFs) on the beam propagation quality of high-power laser beams passing through the multi-apertured ABCD optical system are considered and discussed. It is shown that PFs are able to degrade the beam propagation quality of laser beams more than AMs when the high-power laser beams passing through the aperture-spatial filter, furthermore, one or two aperture-lens optical systems configured appropriate aperture parameters areboth able to upgrade the beam propagation quality of high-power laser beams. The M2 factor of Gaussian beam passing through the multi-aperture optical system is a special case in this paper.