Tunable optical filter and method of manufacture thereof
US8559090B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2008 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Jan 25, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/21
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A tunable optical filter is formed in the structure of an etalon. A thin electro-optic ceramic substrate is fixed between two end substrates. Each end substrate has an inner parallel surface toward said electro-optic ceramic substrate covered by an electrode layer and a reflecting layer. An adhesive which attaches the electro-optic ceramic substrate to each first and second end substrates has a consistency so as to avoid stress on the electro-optic ceramic substrate. A voltage imposed on the electro-optic ceramic substrate by the electrode layers on the inner parallel surfaces of the first and second end substrates effectively controls an optical distance between the reflective coating layers on the inner parallel surfaces of the first and second end substrates of the etalon structure. The electro-optic ceramic substrate is preferably PMN-PT ((1-x)Pb(Mg⅓Nb⅔)O3-x—PbTiO3) and no more than 160 μm thick.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.