Cascaded Raman fiber lasers with ultrahigh spectral purity

Deheri, R and Dash, S and Supradeepa, VR and Balaswamy, V (2022) Cascaded Raman fiber lasers with ultrahigh spectral purity. In: Optics Letters, 47 (14). pp. 3499-3502.

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Abstract

Random distributed feedback (RDFB) cascaded Raman fiber lasers (CRFLs) are simple, wavelength agile, and enable high-power fiber lasers outside emission bandwidths of rare-earth doped fiber lasers. However, the spectral purity, defined as the percentage of total output power in the desired Stokes wavelength band, and relative intensity noise (RIN) of these systems are limited due to the intensity noise of the pump source used for Raman conversion. RIN gets amplified and transferred to Raman Stokes orders which causes incomplete Raman conversion and hence limits the spectral purity. Here, we demonstrate a low-intensity noise (<–100 dBc/Hz from 9 kHz to 10 GHz) CRFL with a record spectral purity of ∼99%, tunable over six Stokes orders, using a very low-intensity noise, narrow linewidth Yb-fiber amplifier as a pump source.

Item Type:	Journal Article
Publication:	Optics Letters
Publisher:	Optica Publishing Group (formerly OSA)
Additional Information:	The copyright for this article belongs to the Optica Publishing Group (formerly OSA).
Keywords:	Feedback amplifiers; Fiber lasers; Rare earth-doped fibers; Rare earths, Distributed feedback; Low-intensity; Pump sources; Raman conversion; Raman fiber lasers; Relative intensity noise; Simple++; Spectral purity; Wavelength-agile, Fiber amplifiers
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	04 Aug 2022 09:27
Last Modified:	04 Aug 2022 09:27
URI:	https://eprints.iisc.ac.in/id/eprint/75292

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