External cavity type light source
US6407869B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1999 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Nov 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/143
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An external cavity type light source which has a semiconductor laser (1) coated on one end (1a) with a reflection prevention film (1A), wherein emitted light from the end face of the semiconductor laser 1 on the reflection prevention film side is converted into collimated light and the collimated light having a wavelength selected through a diffraction grating (2) is fed back into the semiconductor laser (1), and wherein emitted light from an opposite end (1b) of the semiconductor laser (1) is converted into collimated light and the collimated light is gathered and output to an optical fiber (10). An unpolarized light splitter (light branch element) (4) is placed between the diffraction grating (2) and the semiconductor laser (1), and the diffracted light fed back into the semiconductor laser from the diffraction grating is made to branch through the unpolarized light splitter (4) and one branch light is taken out as output light through an optical fiber (15).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.