Optimization study on optical system to homogenize powerful laser beam

Chongguang Li; Zhengrong Wang; Junchang Li

doi:10.1117/12.674265

9 June 2006 Optimization study on optical system to homogenize powerful laser beam

Chongguang Li, Zhengrong Wang, Junchang Li

Proceedings Volume 6149, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 614922 (2006) https://doi.org/10.1117/12.674265
Event: 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2005, Xian, China

Abstract

On an experimental apparatus employed for laser heat treatment, a specific optical device (image-overlapping waveguide cavity with a square aperture) is mounted in order to homogenize the energy distribution of a high-power CO₂ laser beam which is used as a heating source. After the laser beam is transformed by this device, a square homogeneous beam spot with trim edges is got on the surface of heated materials. Based on Fourier optics, a mathematical model has been developed to calculate the power density distribution of the beam spot. Simulation has been done through programming on a computer in this model. By comparing theoretical simulation with experimental thermal spot, this model is validated. Conclusions of this work also demonstrate that the energy distribution of converted beam spot in the image plan, obtained through segmentation-recombination, shows local drastic variations due to interference. To suppress the interference fringes existed in converted beam spot and improve its local homogenization, a further study of the device is made. The optical parameters of the device which effect the final power distribution of converted beam spot are analyzed. An optimized scheme of the device is given through modifying its parameters. According to the scheme, the local homogenization of converted beam spot is improved by one order of magnitude.

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Chongguang Li, Zhengrong Wang, and Junchang Li "Optimization study on optical system to homogenize powerful laser beam", Proc. SPIE 6149, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 614922 (9 June 2006); https://doi.org/10.1117/12.674265

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KEYWORDS

Waveguides

Gas lasers

Optical components

Mathematical modeling

Carbon monoxide

Homogenization

Image segmentation

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