Effects of thin‐film thermal conductivity on the optical damage threshold ofa‐Si film onc‐Si substrate at 1064 nm
作者:
B. S. W. Kuo,
A. W. Schmid,
期刊:
Journal of Applied Physics
(AIP Available online 1993)
卷期:
Volume 74,
issue 8
页码: 5159-5163
ISSN:0021-8979
年代: 1993
DOI:10.1063/1.354279
出版商: AIP
数据来源: AIP
摘要:
Optical damage tests have been performed on a pair ofa‐Si film onc‐Si substrate samples to determine their respective damage‐threshold values. The thermal properties of the two samples have been determined previously in a noncontact, nondamage fashion [B. S. W. Kuo, J. C. M. Li, and A. W. Schmid, Appl. Phys. A55, 289 (1992)], thus providing opportunity to relate the damage threshold to the thermal properties while controlling other factors. The samples have similar film thermal conductivity but much different interface thermal resistance. The damage test results show that the one with higher interface resistance is more vulnerable to high laser‐pulse energy. A heat‐transfer model involving both film thermal conductivity and interface thermal resistance has been developed to predict the damage‐threshold dependence on film thickness. The result using predetermined thermal properties agrees with experimental data qualitatively. It also indicates that the interface property is the dominant factor here, while the impurity‐dominant model cannot be applied, since no difference would be predicted for the two samples.
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