Laser conditioning technique of mid-size laser spot

Yi, 郑轶 Zheng; Zhichao, 刘志超 Liu; Ping, 马平 Ma; Songlin, 陈松林 Chen; Qinghua, 张清华 Zhang

doi:10.3788/hplpb20132512.3180

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“…This debris will pollute and even damage the optical elements. To protect against these various classes of debris, a multielement approach has been adopted [1][2][3]. First, use self-closing nose cone to prevent the debris from going into the beam path; second, use a pneumatic fast valve to prevent the large and low speed fraction; third, use a thin polymer film debris shield to replace the traditional fused silica antireflection (AR) coated window to prevent almost all debris.…”

Section: Introductionmentioning

confidence: 99%

The Transmittance, Transmittance Wavefront, and Laser Induced Damage Properties of Thin Fluoride Polymer Films May Be Used as Short Pulse Laser Debris Shields

Chen

Huang

Jiang

et al. 2016

International Journal of Polymer Science

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Debris mitigation which pollutes and even damages the optical elements is a major challenge for all high-peak-power lasers system. In order to solve the problem, we employed some preliminary research. In this work, first, the film optical properties of fluorinated ethylene propylene (FEP), perfluoroalkoxy copolymer (PFA), and ethane-tetrafluoroethylene copolymer (ETFE) were investigated with respect to their possible application as laser debris shields. The results indicate that three of the polymer films have high transmittance at 355 nm, especially in FEP film, the transmittance of which at 355 nm is near to 94%. The transmittance wavefront and the laser that induce damage of FEP film were investigated further. The result indicates that the wavefront error of FEP film (with a diameter of 90 mm) is about 0.33λ. The damage test was performed by a 355 nm neodymium:yttrium aluminum garnet (Nd:YAG) laser with a 9.3 ns pulse duration, and it was found that the highest nondamage fluence for FEP film is 10.35 J/cm2. Through a demonstration experiment, it was testified that the FEP film can prevent large amount of metal fractions and the FEP film can be used as the debris shields indeed.

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Section: Introductionmentioning

confidence: 99%