Abstract
When laser acts on an optical film, the film will be damaged even unable to work. In this article, a kind of measurement system of optical film's damage threshold is introduced, and it is applied to the experimental research of the reflection coating. The wavelengths of reflection and transmission extremums are determined, according to their spectral characteristic curve. The absorption of the film and the capacity of the film's bearing laser damage can be decided according to the displacement ?? of relative extremum. We can determine whether the film reaches the technical requirements by this means through the measurement of the sample film. Thus we can avoid the multi-repairs of the formal workpiece. There is a fine practical value of this method.
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