Open AccessDetermination of the extinction coefficient of a weakly absorbing multilayer system
Author(s) -
Ping Gu,
Haixing Chen,
Zheng Zhen-Rong,
Long Xu
Publication year - 2005
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.54.3722
Subject(s) - molar absorptivity , transmittance , extinction (optical mineralogy) , optics , materials science , interference (communication) , filter (signal processing) , wavelength , interference filter , physics , telecommunications , computer science , channel (broadcasting) , computer vision
Based on a measured peak transmittance of a narrow band filter, the extinction coefficients of weakly absorbing thin films in a multilayer system can directly be calculated. This is a new method used for determination of the extinction coefficients of thin films in a weakly absorbing multilayer system with very easy to do and very high precision. The absorbing expression in a weakly absorbing interference narrow band filter is deduced. The principle of determination of the extinction coefficient is illustrated and the precision of the calculated extinction coefficient in a Ta2O5/SiO2 filter used in a dense wavelength division multiplexing system is analyzed.