A mathematical energy coupling model was developed to analyze the light transmission in the keyhole and energy distribution on the keyhole *** main characteristics of the model include：1） a prototype of the keyhole ...
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A mathematical energy coupling model was developed to analyze the light transmission in the keyhole and energy distribution on the keyhole *** main characteristics of the model include：1） a prototype of the keyhole and the inverse Bremsstrahlung absorption coefficient in the keyhole plasma are obtained from the experiments;2） instead of using a parallel incident beam,a focused laser beam with real Gaussian intensity distribution is implemented;3） both Fresnel absorption and inverse Bremsstrahlung absorption during multiple reflections are *** calculation results show that the distribution of absorbed laser intensity by the keyhole wall is not *** maximum laser energy is absorbed by the bottom of the keyhole,although no rays irradiate directly onto the *** to analysis of beam focusing characteristics,the location of the focal plane plays a more important role in the laser energy absorption by the front wall than by the rear wall.
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