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Proceedings Paper

Design of laser collimating and focusing system under small working distance
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Paper Abstract

Laser micro thruster based on semiconductor laser has great advantages in volume. However, the design of optical collimating and focusing system is very challenging under highly integrated conditions. The operating distance from the laser exit to the working ablation target needs to be tens of millimeters. Based on the ray tracing method, a convenient and fast design method of the optical collimating and focusing system is proposed under the small working distance. The method is verified by an example. The design conditions are as follows: laser wavelength is 940 nm, fiber core diameter is 105 microns, and the numerical aperture is 0.22; focusing spot diameter is 50 microns; fiber head and ablation surface distance is not more than 20 mm; only one lens is used. Using the method proposed in this paper, the final design results are as follows: doubly convex lens R1 = 5mm, R2 = 25mm~30mm, lens aperture D = 6mm, central thickness TC = 2mm. According to the energy simulation results, the method proposed in this paper is effective.

Paper Details

Date Published: 29 March 2019
PDF: 4 pages
Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110462M (29 March 2019); doi: 10.1117/12.2524435
Show Author Affiliations
Weijing Zhou, Space Engineering Univ. (China)
Hao Chang, Space Engineering Univ. (China)
Jifei Ye, Space Engineering Univ. (China)

Published in SPIE Proceedings Vol. 11046:
Fifth International Symposium on Laser Interaction with Matter
YiJun Zhao, Editor(s)

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