ISSN:
1572-9567
Keywords:
antireflection coating
;
parameter estimation
;
photoacoustic effect
;
thermal diffusivity
;
through-plane
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract In this study, we designed and developed two-layer antireflection (AR) optical coating samples on glass substrates, using different evaporation conditions of coating rates and substrate temperatures for two dielectric materials, MgF2 and ZnS, with different refractive indices. The through-plane thermal diffusivity of these systems was measured using the photoacoustic effect. The optical thicknesses of MgF2 and ZnS layers were fixed at 5λ/4 (λ=514.5 nm) and λ, respectively, and the thermal diffusivities of the samples were obtained from the measured amplitude of the photoacoustic signals by changing the chopping frequency of the Ar+ laser beam. The results demonstrated that the thermal diffusivity of the sample fabricated under the conditions of 10μÅ·s−1 and 150°C had the maximum value and that the results were directly related to the microstructure of the film system.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1006612403028
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