High-efficiency cascaded Raman fiber laser with random distributed feedback

High-efficiency cascaded Raman fiber laser with random distributed feedback

Cascaded lasing provided by Raman gain (at 1115-nm pumping) and random distributed feedback (via Rayleigh backscattering) in a 1.65-km phosphosilicate fiber is studied. Output power for the second Stokes component (1398 nm) exceeds 5 W at pump power of 11 W. In contrast to conventional cascaded Rama...

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Veröffentlicht in:Optics express 2014-10, Vol.22 (21), p.24929-24934
Hauptverfasser: Babin, S A, Vatnik, I D, Laptev, A Yu, Bubnov, M M, Dianov, E M
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Sprache:eng
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Electricity
Feedback
Lasers
Optical Fibers
Photons
Spectrum Analysis, Raman
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container_issue 21
container_start_page 24929
container_title Optics express
container_volume 22
creator Babin, S A
Vatnik, I D
Laptev, A Yu
Bubnov, M M
Dianov, E M
description Cascaded lasing provided by Raman gain (at 1115-nm pumping) and random distributed feedback (via Rayleigh backscattering) in a 1.65-km phosphosilicate fiber is studied. Output power for the second Stokes component (1398 nm) exceeds 5 W at pump power of 11 W. In contrast to conventional cascaded Raman laser with high-Q cavity for the intermediate first Stokes component, there is no cavity here and no cavity losses, correspondingly. Longitudinal power distribution is shown to be quite different also. As a result, the efficiency of pump to 2nd Stokes wave conversion is not influenced by the intermediate stage and depends only on the integral attenuation in the fiber. Herewith, the number of generated 2nd Stokes photons at the output may even exceed the absorbed pump photons due to the lower attenuation of Stokes waves.
doi_str_mv 10.1364/OE.22.024929
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subjects Electricity
Feedback
Lasers
Optical Fibers
Photons
Spectrum Analysis, Raman
title High-efficiency cascaded Raman fiber laser with random distributed feedback
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