Propagation properties of flattened Gaussian beams passing through an off-axis expanding optical system

Yanzhong Zhao; Ting He

doi:10.1117/12.2616854

15 February 2022 Propagation properties of flattened Gaussian beams passing through an off-axis expanding optical system

Yanzhong Zhao, Ting He

Author Affiliations +

Proceedings Volume 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021); 121663Q (2022) https://doi.org/10.1117/12.2616854
Event: Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 2021, Hong Kong, Hong Kong

Abstract

An approximate three-dimensional analytical formula for flattened Gaussian beams passing through an off-axis and defocused expanding optical system are deduced by using the theory of matrix optics and expanding the aperture function into a finite sum of complex Gaussian functions. By numerical computation, the laws governing the variation of the intensity distribution of the output beam with the off-axis size and focal shift are given. It is revealed that the intensity distribution at the export of the expanding optical system has large asymmetric aberrance because of the off-axis of the expanding optical system. But a good focus ability of the intensity distribution can be gotten in the far-field. What’s more, it is shown that a suitable choice of the focal shift would lead to a higher peak intensity and a better focus ability at the far-field than that of no focal shift. The analytical formula has practical reference significance for the design of the laser expanding optical system.

Citation Download Citation

Yanzhong Zhao and Ting He "Propagation properties of flattened Gaussian beams passing through an off-axis expanding optical system", Proc. SPIE 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 121663Q (15 February 2022); https://doi.org/10.1117/12.2616854

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