Raman distributed feedback fiber laser and high power laser system using the same

A Raman laser, pump laser technology, applied in lasers, laser parts, laser monitoring devices, etc., can solve the problems of high power, loss, and difficulty of long grating for narrowband signals.
CN103597675AActive Publication Date: 2014-02-19OFS FITEL LLC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
OFS FITEL LLC
Publication Date
2014-02-19

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Abstract

A Raman distributed feedback (DFB) fiber laser is disclosed. It includes a pump source and a Raman gain fiber of a length smaller than 20 cm containing a distributed feedback (DFB) grating with a discrete phase structure located within no more than 10 % off the center of the grating and wherein the Raman DFB fiber laser generates a laser signal with an optical spectrum, which has an optical bandwidth at half maximum optical intensity of less than 1 gigahertz (GHz) (wherein a maximum intensity frequency is different from the frequency of the pump laser). The Raman laser includes compensation for the nonlinear phase change due to Kerr effect and thermal effect resulting from absorption of the optical field, thus enhancing the conversion efficiency.
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Description

[0001] cross reference

[0002] This application claims the benefit of US Provisional Patent Application No. 61 / 478,677, filed April 25, 2011, which is hereby incorporated by reference. The following references are hereby incorporated by reference: (1) V.E.Perlin and H.G Winful, "Distributed Feedback Fiber Raman Laser", IEEE Journal of Quantum Electronics 3738, (2011); (2) Y.Hu and N.G.R. Broderick, "Improved design of a DFB Raman fiber laser", Opt.Comm.2823356(2009); (3) J.Shi and M.Ibsen, "Effects of phase and amplitude noise on πphase-shifted DFB Raman fiber lasers" Bragg Gratings Poling and Photosensitivity, JThA30 (2010); (4) Agrawal, Nonlinear Fiber Optics, third edition, Academic Press2001, formula (2.3.34) on page 47. Background technique

[0003] There is a great need for high power narrow linewidth laser sources with wavelengths exceeding the gain bandwidth of existing rare earth ions (REIs) such as, for example, ytterbium (1 micron), erbium (1.55 micron) and thuliu...

Claims

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