Observation of visible light flashes in high power near infrared narrow linewidth polarization maintained fiber laser caused by Stimulated Brillouin Scattering triggered cascaded Raman Scattering

Choudhury, V and Aparanji, S and Prkash, R and Velpula, B and Supradeepa, VR (2018) Observation of visible light flashes in high power near infrared narrow linewidth polarization maintained fiber laser caused by Stimulated Brillouin Scattering triggered cascaded Raman Scattering. In: 4th IEEE International Conference on Emerging Electronics, ICEE 2018, 17-19 December 2018, Bengaluru.

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Abstract

We report a surprising observation of visible light flashes in the fusion splice point between the seed stage to the power amplifier in a 500 W narrow-linewidth, polarisation-maintaining Ytterbium-doped fiber laser. The flashes were observed to have a strong correlation with the backward pulses generated due to the onset of Stimulated Brillouin Scattering (SBS) in the laser. We believe these visible flashes appear as a result of second harmonic generation of higher order Raman Stokes components of the 1064nm laser signal. The Raman components are generated by the back-propagating, high peak power SBS pulses at threshold. The Raman Stokes in the core of the fiber generates their respective second harmonic counterparts in the cladding through a Cherenkov-type phase matching process.

Item Type:	Conference Paper
Publication:	2018 4th IEEE International Conference on Emerging Electronics, ICEE 2018
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the institute of Electrical and Electronics Engineers Inc.
Keywords:	Brillouin scattering; Fiber amplifiers; Fiber lasers; Fibers; Infrared devices; Light; Nonlinear optics; Phase matching; Polarization; Power amplifiers; Raman scattering, Cascaded Raman scattering; Cherenkov; High peak power; Narrow-line width; Second harmonics; Stimulated Brillouin Scattering (SBS); Strong correlation; Ytterbium-doped fiber lasers, Stimulated Brillouin scattering
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	01 Aug 2022 09:08
Last Modified:	01 Aug 2022 09:08
URI:	https://eprints.iisc.ac.in/id/eprint/75099

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