M~2-factor of high-power laser beams through a multi-apertured ABCD optical system |
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Authors: | Xiangmei Zeng Meizhi Zhang Dongmei Cao Dingyu Sun Hua Zhou |
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Institution: | (School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,China;School of Physics and Electronic Information,Yanan Univeristiy,Yanan 716000,China) |
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Abstract: | Based on the generalized truncated second-order moments, an approximate analytical formula of the beam propagation factor M~2 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 M~2 factor of Gaussian beam passing through the multi-aperture optical system is a special case in this paper. |
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