MI Qing-gai, WANG Xu-bao, XIAO Rong-shi. Focus Optical System for Kilowatt-class Direct Laser Diodes Stack[J]. Chinese Journal of Luminescence, 2018,39(8): 1107-1114
MI Qing-gai, WANG Xu-bao, XIAO Rong-shi. Focus Optical System for Kilowatt-class Direct Laser Diodes Stack[J]. Chinese Journal of Luminescence, 2018,39(8): 1107-1114 DOI: 10.3788/fgxb20183908.1107.
Focus Optical System for Kilowatt-class Direct Laser Diodes Stack
A focus optical system was designed to focus the rectangular spot of 2 750 W direct laser diodes stack for laser material processing. First
the beam transformation principle was analyzed theoretically. The invert Kepler telescope system principle was applied to expand and collimate the laser beam in the slow axis direction. The fast and slow axis beams were synchronous focused by focus lens. The formula of focus spot size in the fast and slow axis directions was deduced
and the theoretical value of focal depth was calculated. The influence factors of the focus spot size were analyzed. Second
LD stack and the whole optical system were simulated by ZEMAX software. After the ray tracing
the beam variation form and simulate focus spot were obtained. Finally
the experiment was performed
a focus spot whose size was 1.5 mm4.0 mm with 250 mm focal length
and 18.6 mm focal depth was obtained. The merit and demerit of the whole focus optical system and improve orientation in the future were discussed. This focus method could obtain long focal length and high power density focus spot
which can meet the light source requirement of laser cladding and surface treatment.
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references
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