Special Section on Laser Damage III

Thermodynamic damage mechanism of Ni/Cr film on neutral density filter by 1064-nm pulsed laser

[+] Author Affiliations
Jinghua Han, Guoying Feng, Ruifeng Hu, Yanyan Liu

Sichuan University, College of Electronics and Information Engineering, Chengdu 610064, China

Yaguo Li

Fine Optical Engineering Research Center, Chengdu 610041, China

Wei Han

China Academy of Engineering Physics, Laser Fusion Research Center, Mianyang 621900, China

Qiuhui Zhang

Henan Institute of Engineering, Department of Electrical Information Engineering, Zhengzhou 451191, China

Opt. Eng. 56(1), 011011 (Sep 07, 2016). doi:10.1117/1.OE.56.1.011011
History: Received April 14, 2016; Accepted August 5, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Topics

Lasers ; Metals ; Particles

Citation

Jinghua Han ; Yaguo Li ; Wei Han ; Guoying Feng ; Qiuhui Zhang, et al.
"Thermodynamic damage mechanism of Ni/Cr film on neutral density filter by 1064-nm pulsed laser", Opt. Eng. 56(1), 011011 (Sep 07, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011011


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