Special Section on Laser Damage III

Observation of particle ejection behavior following laser-induced breakdown on the rear surface of a sodium chloride optical window

[+] Author Affiliations
Chao Shen, Zhongjie Xu, Ke Wei

National University of Defense Technology, College of Opto-Electronic Science and Engineering, No. 137 Yanwachi Street, Changsha 410073, China

Hunan Provincial Key Laboratory of High Energy Laser Technology, No. 137 Yanwachi Street, Changsha 410073, China

Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser, No. 137 Yanwachi Street, Changsha 410073, China

Xiang’ai Cheng, Tian Jiang

National University of Defense Technology, College of Opto-Electronic Science and Engineering, No. 137 Yanwachi Street, Changsha 410073, China

Hunan Provincial Key Laboratory of High Energy Laser Technology, No. 137 Yanwachi Street, Changsha 410073, China

Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser, No. 137 Yanwachi Street, Changsha 410073, China

National University of Defense Technology, State Key Laboratory of High Performance Computing, No.137 Yanwachi Street, Changsha 410073, China

Opt. Eng. 56(1), 011009 (Aug 03, 2016). doi:10.1117/1.OE.56.1.011009
History: Received April 18, 2016; Accepted July 13, 2016
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Abstract.  Laser-induced rear surface breakdown process of sodium chloride (NaCl) optical window was investigated based on the time-resolved shadowgraphy and interferometry. Violent particle ejection behavior lasting from tens of nanoseconds to tens of microseconds after the breakdown was observed. Classified by the particle velocity and propagating direction, the ejection process can be divided into three phases: (1) high-speed ejection of liquid particles during the first 100-ns delay; (2) micron-sized material clusters ejection from 100-ns to 1-μs delay; (3) larger and slower solid-state particles ejection from 1  μs to tens of microseconds delay. The moving directions of particles in the first and third phases are both perpendicular to the sample surface while particles ejected in the second phase exhibits angular ejection and present a V-like particle pattern. Mechanisms include explosive boiling, impact ejection, and shockwave ejection are discussed to explain this multiple phase ejection behavior. Our results highlight the significance of impact ejection induced by recoil pressure and backward propagating internal shockwave for laser-induced rear surface breakdown events of optical materials with low melting point.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Chao Shen ; Xiang’ai Cheng ; Zhongjie Xu ; Ke Wei and Tian Jiang
"Observation of particle ejection behavior following laser-induced breakdown on the rear surface of a sodium chloride optical window", Opt. Eng. 56(1), 011009 (Aug 03, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011009


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