Jacob W Lin

US Patent:

6716779, Apr 6, 2004

Filed:

Aug 14, 2001

Appl. No.:

09/929688

Inventors:

Jacob W. Lin - Richardson TX

Assignee:

OptoElectronics International, Inc. - Hsin-Chu
Yeong C. Lin - Fountain Valley CA

International Classification:

C03C 3085

US Classification:

501 64, 501 69, 501 70, 501 73

Abstract:

A silicate based composition for optical glass used as a substrate for thin film optical interference filters having a stable transmission band center wavelength and bandwidth has a relatively high coefficient of thermal expansion, high Youngs modulus and high optical transmittance in the near infrared (NIR) wavelength range of about 950 nm to about 1600 nm. The coefficient of thermal expansion of the glass composition is adjustable to particular values to result in minimal wavelength shift in filters made by depositing thin films of particular dielectric materials onto a substrate made of the glass, the composition being varied from a preferred baseline composition consisting of about 43. 2% SiO2, 7% Al2O3, 12. 7% CaO, 7. 3% SrO, 7. 8% Li2O, 13. 2% Na2O, 8. 0% K2O, 0.