Fiber multimode laser with reduced noise
US5805621A · kind A · utility
17Cited by
1References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Nov 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/08022
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Applicants have discovered that the intermodal beat noise of a fiber multimode laser can be substantially reduced by providing the fiber with an output coupler of broadened bandwidth. In a preferred embodiment, a reduced-noise, high power light source comprises a cladding pumped fiber laser having a chirped output grating. Experiments show that increasing the output bandwidth from 0.254 to 0.577 nm reduces the relative intensity-to-noise ratio 10 dB in a Nd-doped fiber laser. Increasing the bandwidth from 0.2 nm to 0.3 nm in a Yb-doped laser similarly reduces the noise by 12 dB.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.