Visible light generation in the cladding of optical fibers carrying near-infrared continuous-wave lasers due to Cherenkov-phase matched harmonic conversion

Aparanji, S and Arun, S and Balaswamy, V and Supradeepa, V R (2020) Visible light generation in the cladding of optical fibers carrying near-infrared continuous-wave lasers due to Cherenkov-phase matched harmonic conversion. In: Optics Letters, 45 (4). pp. 993-996.

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Abstract

In this work, we report and analyze the cause of the surprising observation of visible light generation in the cladding of silica-based continuous-wave (CW), near-infrared fiber lasers. We observe a visible rainbow of hues in a cascaded Raman fiber laser, which we attribute to second and third harmonic conversion of the different wavelength components propagating in the core of the fiber. The light in the cladding of the fiber occurs through Cherenkov-type phase matching, and a mathematical analysis is presented to estimate the power of the harmonic light generated. We then extend this theory to visible light generation in other types of fiber lasers. Specifically, we analyze the case of a CW supercontinuum generated in standard telecom fibers, and verify our theoretical predictions with experimental results through visible spectra collected.

Item Type:	Journal Article
Publication:	Optics Letters
Publisher:	OSA Publishing
Additional Information:	Copyright of this article belongs to OSA Publishing
Keywords:	Fiber lasers; Harmonic analysis; Infrared devices; Laser theory; Light; Optical fibers; Phase matching; Silica; Supercontinuum generation, Continuous waves; Harmonic conversion; Mathematical analysis; Raman fiber lasers; Second and third harmonics; Super continuum; Telecom fibers; Visible spectra, Continuous wave lasers
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	06 Mar 2020 10:04
Last Modified:	06 Mar 2020 10:04
URI:	http://eprints.iisc.ac.in/id/eprint/64692

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