A Reflective Optical System for Converting Elliptical Gaussian Laser Beam to Flat-top Beam

Xiang-xiang, 孟祥翔 Meng; Wei-qi, 刘伟奇 Liu; Hua, 柳华 Liu; Zhong-lun, 魏忠伦 Wei; Yusi, 康玉思 Kang; Rui, 冯睿 Feng; Wei-zhen, 吕伟振 Lv

doi:10.3788/fgxb20133407.0940

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“…Most of the existing beam shaping methods for realizing annular light use two different optical systems. One is a geometric optical method, which selects the off-axis reflection system [14]. The other is a coaxial transmission system using diffractive optical elements.…”

Section: Introductionmentioning

confidence: 99%

Design of annular beam shaping system based on freeform surface

Xing

Ma²,

Chen³

2023

International Conference on Optical Technology, Semiconductor Materials, and Devices (OTSMD 2022)

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Laser is widely used in manufacturing, information transmission, biotechnology and other fields,but these fields often need the input beam with specific intensity distribution, and the Gaussian beam needs beam shaping to achieve the required illuminance distribution.Annular flattned beam has great demand in satellite communication, laser high-speed welding and other fields.The existing beam shaping system needs to compensate off-axis aberration and chromatic aberration, and its design process and system structure are complex.In this paper, we propose a design method of coaxial reflection annular beam shaping system based on geometric optics principle.Through ray mapping method to establish a mapping relationship,through geometrical optics principle to derive the freeform surface equation.We constructed the beam shaping system of the double freeform mirror, which can realize the annular flattened beam with a uniformity of 96.35%.Compared with the existing beam shaping system, the coaxial double reflection system has fewer optical elements, more compact structure, less calculation of optical element structure, and avoids off-axis aberration and chromatic aberration under the condition of similar shaping uniformity.

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Section: Introductionmentioning

confidence: 99%