Continuous wave CO<inf>2</inf>laser induced damage thresholds in optical components. Puttick, K., Holm, R., Ristau, D., Natzschka, U., Kiriakidis, G., Garawal, N., Judd, E., Holland, D., Greening, D., Ellis, N., Wilkinson, M., Pamies, M., & Sanviti, C. In Proceedings of SPIE - The International Society for Optical Engineering, volume 3244, 1997. doi abstract bibtex The measurement of intrinsic laser induced damage thresholds (LIDT) in optical components for continuous wave (CW) CO 2 radiation has been investigated. A combination of analytical and numerical models showed that the temperature rise is mainly determined by the surface absorption in transmissive as well as reflective components, and is proportional to the ratio of power to linear dimension (P/d) of the irradiated spot rather than to the conventional power/area (P/d 2 ) parameter. The former ratio therefore represents the correct power scaling law for LIDT measurement in CW laser systems. The precise time domain within which this law holds is a function of spot diameter. This prediction has been confirmed by experimental LIDT tests on well characterised uncoated ZnSe substrates and copper mirrors, and on coated ZnSe windows and copper mirrors. Measured P/d values, though lower than predicted by modelling are considerably higher than those inferred from the technical literature, and show that transmissive components may be used at much higher powers than are at present believed. The results indicate that surface absorption occurs primarily in the sub-surface processing layer. This has been shown by transmission electron microscopy and spectroscopic ellipsometry to be a few hundred nm in depth.
@inproceedings{
title = {Continuous wave CO<inf>2</inf>laser induced damage thresholds in optical components},
type = {inproceedings},
year = {1997},
keywords = {CO laser 2,Damage threshold,High power,Infra-red,Optical components,Surface absorption},
volume = {3244},
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created = {2017-12-03T10:44:26.651Z},
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last_modified = {2017-12-12T09:00:54.050Z},
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abstract = {The measurement of intrinsic laser induced damage thresholds (LIDT) in optical components for continuous wave (CW) CO 2 radiation has been investigated. A combination of analytical and numerical models showed that the temperature rise is mainly determined by the surface absorption in transmissive as well as reflective components, and is proportional to the ratio of power to linear dimension (P/d) of the irradiated spot rather than to the conventional power/area (P/d 2 ) parameter. The former ratio therefore represents the correct power scaling law for LIDT measurement in CW laser systems. The precise time domain within which this law holds is a function of spot diameter. This prediction has been confirmed by experimental LIDT tests on well characterised uncoated ZnSe substrates and copper mirrors, and on coated ZnSe windows and copper mirrors. Measured P/d values, though lower than predicted by modelling are considerably higher than those inferred from the technical literature, and show that transmissive components may be used at much higher powers than are at present believed. The results indicate that surface absorption occurs primarily in the sub-surface processing layer. This has been shown by transmission electron microscopy and spectroscopic ellipsometry to be a few hundred nm in depth.},
bibtype = {inproceedings},
author = {Puttick, K. and Holm, R. and Ristau, D. and Natzschka, U. and Kiriakidis, G. and Garawal, N. and Judd, E. and Holland, D. and Greening, D. and Ellis, N. and Wilkinson, M. and Pamies, M.G. and Sanviti, C.},
doi = {10.1117/12.307045},
booktitle = {Proceedings of SPIE - The International Society for Optical Engineering}
}
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