The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 2005
Filed:
Jul. 10, 2000
A. Neil Boucher, Whetstone, GB;
Dennis G. Fischer, Auburn, CA (US);
A. Neil Boucher, Whetstone, GB;
Dennis G. Fischer, Auburn, CA (US);
Coherent Optics Europe Limited, Whetstone, GB;
Abstract
An optical filter uses a multi-layer, stack of alternating dielectric layers () of different refractive indices, a dielectric spacer layer () and metal layer (), to achieve a narrow overall absorption bandwidth, with high reflectance upon either side. A tunable (optical) filter variant uses a dielectric stack and spacer coating of spatially-varying thickness, that is a coating of depth varying, say linearly and/or circularly, according to position across an absorbent layer or substrate, whereby, at different positions on the surface, a different wavelength is absorbed. A tunable laser () uses opposed tunable filters () bounding a lasing medium (), such as COgas, for selective variable stimulated emission of radiation ().