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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.

Active Publication Date: 2014-02-19
OFS FITEL LLC
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Problems solved by technology

[0006] (1) Losses due to UV exposure during writing the grating,
[0007] (2) Difficulty in fabricating long gratings with high consistency,
[0011] In general, the use of fiber Raman gain to generate narrowband signals at wavelengths far from the REI gain bandwidth has not been achieved at high power using available pumping in conventional laser cavities designed with fiber Bragg gratings.

Method used

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

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Embodiment Construction

[0060] Tunable lasers with a single frequency and narrow linewidth have the potential to be used in a wide variety of applications, such as remote sensing, LIDAR, spectroscopy, optical coherence tomography, and others.

[0061] There are many ways in which laser radiation can be obtained, including external cavity lasers, semiconductors, fiber distributed feedback (DFB) lasers. DFB lasers can be created with fiber Bragg gratings written in the core of an active fiber waveguide and are capable of producing narrowband laser radiation when pumped at the appropriate wavelength. Compared with semiconductor DFB lasers, fiber DFB lasers are attractive because of their superior optical properties, including low noise and narrower linewidth. Furthermore, the in-fiber design of this fiber DFB laser enables efficient coupling to fiber amplifiers and other fiber components. "Pumping" as mentioned here means supplying an energy source that is usually converted into laser signal (output) e...

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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.

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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Application Information

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IPC IPC(8): H01S3/30
CPCH01S3/0826H01S3/1086H01S3/094003H01S3/0014H01S3/094046H01S3/094042H01S3/0675H01S3/07H01S3/06712H01S3/302H01S3/08022H01S3/067H01S3/30
Inventor K·S·阿贝丁T·卡瑞姆普J·C·普尔奎J·W·尼科尔森P·S·维斯特布克
Owner OFS FITEL LLC
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