Temperature dependence of laser-induced damage threshold of 355-nm Al2O3/MgF2 HR coatings

Meiqiong Zhan; Tianya Tan; Dawei Zhang; Hongbo He; Jianda Shao; Zhengxiu Fan

doi:10.1117/12.608012

8 December 2004 Temperature dependence of laser-induced damage threshold of 355-nm Al₂O₃/MgF₂ HR coatings

Meiqiong Zhan, Tianya Tan, Dawei Zhang, Hongbo He, Jianda Shao, Zhengxiu Fan

Proceedings Volume 5774, Fifth International Conference on Thin Film Physics and Applications; (2004) https://doi.org/10.1117/12.608012
Event: Fifth International Conference on Thin Film Physics and Applications, 2004, Shanghai, China

Abstract

Laser-induced damage threshold (LIDT) of 355nm was a more severe problem than that of 1064nm. This work had been carried out to obtain high LIDT and high reflectance for Al₂O₃/MgF₂ quarter wave multilayer stacks (35 layers). All the samples were deposited by electron beam evaporation using the same deposition process at different deposition temperatures. LIDT was measured by using a 355 nm Nd:YAG pulsed laser with a pulse width of 8 ns. It was found that deposition temperature had a fundamental effect on the thresholds of HR coatings. LIDT up to 18.5J/cm² was achieved when the deposition temperature was 280°C. Transmittance and high reflectance of the samples were measured by Lambda 900 Spectrophotometer and the high reflectance of 98.7% was achieved. An absorption dominated model was proposed which met the results of damage thresholds.

Citation Download Citation

Meiqiong Zhan, Tianya Tan, Dawei Zhang, Hongbo He, Jianda Shao, and Zhengxiu Fan "Temperature dependence of laser-induced damage threshold of 355-nm Al₂O₃/MgF₂ HR coatings", Proc. SPIE 5774, Fifth International Conference on Thin Film Physics and Applications, (8 December 2004); https://doi.org/10.1117/12.608012

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