Article

Effect of defects on long-pulse laser-induced damage of two kinds of optical thin films.

School of Science, Nanjing University of Science & Technology, Nanjing 210094, China.
Applied Optics (impact factor: 1.41). 10/2010; 49(29):5537-44. pp.5537-44
Source: PubMed

ABSTRACT In order to study the effect of defects on the laser-induced damage of different optical thin films, we carried out damage experiments on two kinds of thin films with a 1 ms long-pulse laser. Surface-defect and subsurface-defect damage models were used to explain the damage morphology. The two-dimensional finite element method was applied to calculate the temperature and thermal-stress fields of these two films. The results show that damages of the two films are due to surface and subsurface defects, respectively. Furthermore, the different dominant defects for thin films of different structures are discussed.

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Keywords

1 ms long-pulse laser
 
calculate
 
damage morphology
 
damages
 
defects
 
different dominant defects
 
different optical thin films
 
different structures
 
subsurface defects
 
subsurface-defect damage models
 
Surface-defect
 
thermal-stress fields
 
thin films
 
two films
 
two-dimensional finite element method
 

Bin Wang