Visible light flashes induced by pulsed stimulated Brillouin scattering in narrow-linewidth, high-power, near-IR fiber lasers

Choudhury, V and Aparanji, S and Prakash, R and Balaswamy, V and Supradeepa, VR (2021) Visible light flashes induced by pulsed stimulated Brillouin scattering in narrow-linewidth, high-power, near-IR fiber lasers. In: Journal of Optics (United Kingdom), 23 (7).

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Abstract

We report an interesting observation of visible light flashes indicating pulsing events in Near Infrared fiber laser systems. Using a narrow-linewidth, continuous-wave (CW) fiber laser operating at 1064 nm, we observed visible flashes composed of faint, red, orange, yellow and green colors. Concurrently with the visible flashes, the spectra in the backward direction showed different Raman Stokes orders of 1064 nm for a silica medium. We attribute this form of visible light generation to Cherenkov-type phase-matched harmonic generation in optical fibers enabled by high-peak-power parasitic pulses. These pulses are attributed to the onset of stimulated Brillouin scattering. The harmonics of different Raman Stokes orders of the pulses are responsible for the different visible colors observed. This effect is potentially observable in any laser system with a high optical power with a CW, quasi-CW or pulsed form. © 2021 IOP Publishing Ltd

Item Type:	Journal Article
Publication:	Journal of Optics (United Kingdom)
Publisher:	IOP Publishing Ltd
Additional Information:	The copyright for this article belongs to IOP Publishing Ltd
Keywords:	Fiber lasers; Infrared devices; Light; Nonlinear optics; Optical fibers; Phase matching; Silica; Stimulated Brillouin scattering, Continuous waves; High optical power; High peak power; Narrow-line width; Near Infrared; Parasitic pulse; Pulsing events; Silica mediums, Pulsed lasers
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	31 Aug 2021 11:18
Last Modified:	31 Aug 2021 11:18
URI:	http://eprints.iisc.ac.in/id/eprint/69473

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