Experiments on laser cleaning of sooted optical windows

To develop laser-ignition technology, transparent glass plates were artificially sooted and irradiated repetitively by laser from the front (sooted) and back sides separately. Generally, the back-side irradiation was more effective at soot removal. However, the cleaning effect was saturated after th...

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Bibliographic Details
Published inApplied optics. Optical technology and biomedical optics Vol. 57; no. 36; p. 10522
Main Authors Endo, Takuma, Okada, Kazuki, Ito, Yuto, Kim, Wookyung, Johzaki, Tomoyuki, Namba, Shin-Ichi
Format Journal Article
LanguageEnglish
Published United States 20.12.2018
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Summary:To develop laser-ignition technology, transparent glass plates were artificially sooted and irradiated repetitively by laser from the front (sooted) and back sides separately. Generally, the back-side irradiation was more effective at soot removal. However, the cleaning effect was saturated after thousands of laser shots. Although the saturated soot quantity was a decreasing function of the laser fluence per pulse, its magnitude remained the same for both front-side and back-side irradiations. In examining several soot-removal mechanisms proposed so far, it was found that the aerodynamic force produced by the flow induced by the laser heating of the soot was the most plausible mechanism.
ISSN:2155-3165
DOI:10.1364/ao.57.010522