Filter device and laser apparatus
US11835776B2 · kind B2 · utility
0Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 9, 2019 |
| Grant date | Dec 5, 2023 |
| Priority date | — |
| Expiry date | Mar 24, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/03
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A filter device includes: an optical fiber that allows light having a predetermined wavelength to propagate in multimode; a first higher-order mode filter that removes at least part of the light in any higher order mode than a predetermined mode in the light in the multimode propagating in the optical fiber; and a fiber Bragg grating that transmits the light having the predetermined wavelength and reflects light having a particular wavelength longer than the predetermined wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.