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Proceedings Paper

Design and fabrication of an elliptical micro-lens array with grating for laser safety
Author(s): L. H. Li; B. Q. Wu; C. Y. Chan; W. B. Lee; L. H. Dong
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Paper Abstract

With the enormous expansion of laser usage in medicine, industry and research, all facilities must formulate and adhere to specific safety methods that appropriately address user protection. The protective ellipticalal microstructure with grating is a novel technology which can provide the principal means of ensuring against ocular injury, and must be worn at all times during laser operation. On the basis of Fresnel's law and the diffractive law, Solidworks and Lighttools software are applied to design the elliptical micro-lens array and correspondent grating. The height of the microstructure is 100um and its period is 3mm. The period of grating is 5um. It is shown that the amount of emergent light of a specific wavelength (1064nm) can reflect more than 40° from the incident light through simulation, while the incident light is perpendicular to the microstructure. The fabrication adopts the ultra-precision single point diamond method and injection molding method. However, it is found in the test that the surface roughness has a serious effect on the angle between the emergent and incident light. As a result, the element can reflect the vertical incidence beam into a tilted emergent beam with a certain angular degree , as well as protecting users from laser damage injures.

Paper Details

Date Published: 15 October 2015
PDF: 6 pages
Proc. SPIE 9676, AOPC 2015: Optical Design and Manufacturing Technologies, 96760P (15 October 2015); doi: 10.1117/12.2199362
Show Author Affiliations
L. H. Li, The Hong Kong Polytechnic Univ. (Hong Kong, China)
B. Q. Wu, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Changchun Univ. of Science and Technology (China)
C. Y. Chan, The Hong Kong Polytechnic Univ. (Hong Kong, China)
W. B. Lee, The Hong Kong Polytechnic Univ. (Hong Kong, China)
L. H. Dong, Changchun Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 9676:
AOPC 2015: Optical Design and Manufacturing Technologies
Lin Li; Kevin P. Thompson; Ligong Zheng, Editor(s)

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