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

doi:10.1088/1674-1056/ab81f1

Abstract Based on the generalized truncated second-order moments, an approximate analytical formula of the beam propagation 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 are both 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.

Keywords: amplitude modulations (AMs) phase fluctuations (PFs) multiple hard-edged aperture beam propagation factor

Received: 20 August 2019
Revised: 04 February 2020
Accepted manuscript online:

PACS:	42.60.Fc	(Modulation, tuning, and mode locking)
	42.55.-f	(Lasers)
	42.79.Ag	(Apertures, collimators)
	42.60.Fc	(Modulation, tuning, and mode locking)

Fund: Project supported by the Science Fund from the Shaanxi Provincial Education Department, China (Grant No. 18JK0723).

Corresponding Authors: Xiangmei Zeng
E-mail: xmzz79@163.com

Cite this article:

Xiangmei Zeng(曾祥梅), Meizhi Zhang(张美志), Dongmei Cao(曹冬梅), Dingyu Sun(孙鼎宇), Hua Zhou(周花) M²-factor of high-power laser beams through a multi-apertured ABCD optical system 2020 Chin. Phys. B 29 064206

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

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