To understand the surface morphology evolution of fused silica induced by 10.6μm CO2 laser irradiation at different parameters, this paper reports that optical microscopy, profilometry, and hydrophilicity tests are u...To understand the surface morphology evolution of fused silica induced by 10.6μm CO2 laser irradiation at different parameters, this paper reports that optical microscopy, profilometry, and hydrophilicity tests are utilized to characterize the surface structure and roughness of the laser irradiated area. The results show that three typical surface morphologies and two typical hydrophilicity test images are observed at different laser powers and pulse durations. The correlations between surface temperature and surface morphology as well as hydrophilicity behaviours are presented. The different hydrophilicity behaviours are related to surface structures of the laser-induced crater and thermal diffusion area. The thermal diffusion length monotonously increases with increasing laser power and pulse duration. The crater width is almost determined by the laser beam size. The crater depth is more sensitive to the laser power and pulse duration than the crater width.展开更多
Dry laser cleaning(DLC)and laser shockwave cleaning(LSC)are used to remove the particulate contamination from SiO_(2) sol−gel optical films.The results show that the LSC with a shockwave initiated by plasma formation ...Dry laser cleaning(DLC)and laser shockwave cleaning(LSC)are used to remove the particulate contamination from SiO_(2) sol−gel optical films.The results show that the LSC with a shockwave initiated by plasma formation under a focused laser beam pulse offers much better efficiency than DLC.Silica particles up to 10µm on SiO_(2 )films can be removed without substrate damage at a gap distance of 0.5 mm,and a more uniform surface microstructure can be obtained after LSC.Furthermore,it is demonstrated that the transmittance of contaminated SiO2 films can be restored to the as-deposited value after the LSC on dispersed-particle zones.LSC has potential applications in engineering-oriented large components.展开更多
基金supported by the National High Technology Research and Development Program of China (Grant No. 2008AA8040508)the Foundation for Young Scholars of University of Electronic Science and Technology of China (Grant No. L08010401JX0806)
文摘To understand the surface morphology evolution of fused silica induced by 10.6μm CO2 laser irradiation at different parameters, this paper reports that optical microscopy, profilometry, and hydrophilicity tests are utilized to characterize the surface structure and roughness of the laser irradiated area. The results show that three typical surface morphologies and two typical hydrophilicity test images are observed at different laser powers and pulse durations. The correlations between surface temperature and surface morphology as well as hydrophilicity behaviours are presented. The different hydrophilicity behaviours are related to surface structures of the laser-induced crater and thermal diffusion area. The thermal diffusion length monotonously increases with increasing laser power and pulse duration. The crater width is almost determined by the laser beam size. The crater depth is more sensitive to the laser power and pulse duration than the crater width.
基金by the National High-Technology Research and Development Program of China(2008AA8040508)the Funda-mental Research Funds for the Central Universities(ZYGX2009X007).
文摘Dry laser cleaning(DLC)and laser shockwave cleaning(LSC)are used to remove the particulate contamination from SiO_(2) sol−gel optical films.The results show that the LSC with a shockwave initiated by plasma formation under a focused laser beam pulse offers much better efficiency than DLC.Silica particles up to 10µm on SiO_(2 )films can be removed without substrate damage at a gap distance of 0.5 mm,and a more uniform surface microstructure can be obtained after LSC.Furthermore,it is demonstrated that the transmittance of contaminated SiO2 films can be restored to the as-deposited value after the LSC on dispersed-particle zones.LSC has potential applications in engineering-oriented large components.
