Optical filter, laser module, and wavelength locker module
US6914921B2 · kind B2 · utility
1Cited by
13References
13Claims
0Family size
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Key dates
| Filing date | Sep 27, 2002 |
| Grant date | Jul 5, 2005 |
| Priority date | — |
| Expiry date | Nov 20, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/02492
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
On a second thermo-module there are disposed a prism, an optical filter, and a sub-mount, via a base respectively. On the front side of the sub-mount, there are disposed a first photodetector and a second photodetector. The optical filter is structured with a crystal member that satisfies a condition that α+(1/n0)×(Δn/ΔT) becomes not more than 3.5, where α is a coefficient of linear expansion, n0 is a refractive index at a normal temperature, and Δn is a change of a refractive index corresponding to a temperature variation ΔT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.