Optical fiber light source based on third-harmonic generation

Details Optical fiber light source based on third-harmonic generation Optical fiber light source based on third-harmonic generation

2007-02-28

2008-03-04

Sanghavi, Hemang (Department: 2874)

Optical: systems and elements

Optical frequency converter

Harmonic generator

C385S126000, C372S022000

Reexamination Certificate

active

07339721

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<Δ1and 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)λPand 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.

REFERENCES:
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A. Efimov et al, “Phase-matched third harmonic generation in microstructured fibers”, Optics Express, vol. 11, No. 20, Oct. 6, 2003, pp. 2567-2576.
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J. Thøgersen et al, “Third harmonic generation in standard and erbium-doped fibers”, Optics Communications 110 (1994), pp. 435-444.

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