Optical fiber light source based on third-harmonic generation
US7339721B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2007 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | Feb 28, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/354
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical-fiber-based light source that generates light via third-harmonic (TH) generation is disclosed. The light source includes a pump light source that provides pump light having a fundamental mode of wavelength λP. The light source also includes an optical fiber optically coupled to the pump light source. The optical fiber's core refractive index profile has (i) a central region with a refractive index value Δ1, (ii) a first annular region immediately surrounding the central region and having a refractive index value Δ2, and (iii) a second annular region immediately surrounding the first annular region and having a refractive index value Δ3. The optical fiber satisfies the conditions Δ2<Δ1 and Δ2<Δ3, and max{Δ1,Δ3}−Δ2>1.2%. The pump light produces TH-generated light having a higher-order mode of wavelength λTH=(1/3)λP and that is outputted at the optical fiber output end. The pump light fundamental mode overlaps the TH-generated-light higher order mode over the length of the optical fiber to provide a conversion efficiency of 1% or greater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.