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Optical Engineering

Thermodynamic damage mechanism of Ni/Cr film on neutral density filter by 1064-nm pulsed laser
Author(s): Jinghua Han; Yaguo Li; Wei Han; Guoying Feng; Qiuhui Zhang; Ruifeng Hu; Yanyan Liu
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Paper Abstract

We investigate the damage characteristics and mechanism of neutral density filters consisting of metal film on K9 glass substrate by 1064-nm pulsed laser. The damage morphologies present marked differences with different laser pulse energies. Specifically, with the increase of laser fluence, the damage pits density increase as well, and at the same time, the cracks appear around the pits and interconnect, which lead to the abscission of film. The damage mechanism has been studied from the viewpoint of embedded impurities in the film. The theoretical results show that the difference between the thermodynamic properties of impurities and film can lead to thermos-elastic stress, which plays important roles in deformation of film, nucleation and propagation of cracks. Last, methods have been proposed to improve the laser damage resistance by controlling the size distribution of impurity particles and increasing the film tensile strength.

Paper Details

Date Published: 7 September 2016
PDF: 9 pages
Opt. Eng. 56(1) 011011 doi: 10.1117/1.OE.56.1.011011
Published in: Optical Engineering Volume 56, Issue 1
Show Author Affiliations
Jinghua Han, Sichuan Univ. (China)
Yaguo Li, Chengdu Fine Optical Engineering Research Ctr. (China)
Wei Han, China Academy of Engineering Physics (China)
Guoying Feng, Sichuan Univ. (China)
Qiuhui Zhang, Sichuan Univ. (China)
Henan Institute of Engineering (China)
Ruifeng Hu, Sichuan Univ. (China)
Yanyan Liu, Sichuan Univ. (China)


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