4 January 2008 Square laser beam of high power transverse flow CO2 laser and its application
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By means of the Collins formula and finite-element method, diffraction integral equation of the square resonator with spherical mirrors is transformed to the finite-element matrix equation, mode-fields of the square aperture resonator is calculated. Experiment with square aperture resonator is done on HUST2000 high power transverse flow CO2 laser. The results show that a square multi-mode beam with uniform comparatively intensity appeares in near field distribution. Laser quenching on 45# steel is done by using the square multi-mode beam and general circle beam. The hardened case caused by the square multi-mode beam is more uniform than general circle beam.
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Yingxiong Qin, Xiahui Tang, Rutao Zhong, Zhengjia Li, "Square laser beam of high power transverse flow CO2 laser and its application", Proc. SPIE 6825, Lasers in Material Processing and Manufacturing III, 68250W (4 January 2008); doi: 10.1117/12.757416; https://doi.org/10.1117/12.757416

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