Optical fiber light source based on third-harmonic generation

Optical: systems and elements – Optical frequency converter – Harmonic generator

Reexamination Certificate

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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:
patent: 5106176 (1992-04-01), Poumellec et al.
patent: 2007/0274651 (2007-11-01), DiGiovanni et al.
A. Efimov et al, “Phase-matched third harmonic generation in microstructured fibers”, Optics Express, vol. 11, No. 20, Oct. 6, 2003, pp. 2567-2576.
V. Grubsky, “Glass micro-fibers for efficient third harmonic generation”, Optic Express, vol. 13, No. 18, Sep. 5, 2005, pp. 6798-6806.
D. L. Nicácio, et al, “Third-harmonic generation in GeO2doped silica single-mode optical fibers”, Applied Physics Letters 62 (18), May 3, 1993, pp. 2179-2181.
J. Thøgersen et al, “Third harmonic generation in standard and erbium-doped fibers”, Optics Communications 110 (1994), pp. 435-444.

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