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Proceedings Paper

Measurement of thermal expansion coefficient and biaxial modulus of DWDM filters using phase-shift interferometer
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Paper Abstract

Dense-wavelength-division-multiplexing (DWDM) filter is a very sensitive component in wavelength shift. The temperature shift of central wavelength (TSCW) of filter is depended on the mechanical properties of the stress. In this paper, a modified Stoney's equation was applied to analyze the thermal stress of DWDM filters for the reason of the thickness ratio (thin film thickness/substrate thickness) larger than 1%. The phase-shift interferometer and TSCW were applied to measure and achieve the coefficient of thermal expansion (CTE), biaxial modulus, temperature optical coefficient, stress optical coefficient, and Poisson ratio of DWDM filter. Based on this method, we can obtain the CTE of DWDM filter 0.87pm/ °C ,the biaxial modulus 41 GPa, Poisson ratio 0.22, temperature optical coefficient 1.4×10-5 / °C, and stress optical coefficients -1.9×10-12 /Pa. To achieve zero TSCW for a DWDM filter, the CTE of the substrate should be 10.36ppm/ °C.

Paper Details

Date Published: 25 September 2008
PDF: 8 pages
Proc. SPIE 7101, Advances in Optical Thin Films III, 71010T (25 September 2008); doi: 10.1117/12.798743
Show Author Affiliations
Chien-Cheng Kuo, National Central Univ. (Taiwan)
Sheng-Hui Chen, National Central Univ. (Taiwan)
Cheng-Chung Lee, National Central Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7101:
Advances in Optical Thin Films III
Norbert Kaiser; Michel Lequime; H. Angus Macleod, Editor(s)

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