Achieving high-power, ultra-high spectral purity cascaded Raman fiber lasers through low intensity-noise pump sources

Balaswamy, V and Vikram, BS and Raj, P and Harshitha, MR and Nair, D and Supradeepa, VR (2019) Achieving high-power, ultra-high spectral purity cascaded Raman fiber lasers through low intensity-noise pump sources. In: 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, 23 - 27 June 2019, Munich; Germany.

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Abstract

Cascaded Raman fiber lasers (CRFLs) based on random distributed feedback are proven to be wavelength agile where, by simply adjusting the input pump power and wavelength, high-power continuous wave fiber lasers at arbitrary wavelengths were demonstrated 1-3. However, these systems have limited degree of wavelength conversion or spectral purity defined as the percentage of output power in the desired wavelength band. Recently, use of fiber-based amplified spontaneous emission (ASE) sources have been proposed to increase the spectral purity 4. In 4 authors attributed relative intensity noise (RIN) of the pump laser, as the reason for reduction in spectral purity. Here, we comprehensively investigate the role of RIN on spectral purity by using three kinds of pump lasers for cascaded Raman conversion. We demonstrate that by using high-power, phase-modulated (PM) narrow-linewidth fiber amplifier as the pump source, ultra-high spectral purity of >97% over the entire Raman stokes orders (from 1.1µm to 1.5µm) can be achieved. © 2019 IEEE

Item Type:	Conference Paper
Publication:	Optics InfoBase Conference Papers
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	Copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Continuous wave lasers; Distributed feedback lasers; Fiber amplifiers; Fiber lasers; Fibers, Amplified spontaneous emission source; Distributed feedback; Narrow-line width; Raman conversion; Raman fiber lasers; Relative intensity noise; Wavelength band; Wavelength-agile, Pumping (laser)
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	15 Apr 2021 10:32
Last Modified:	28 Aug 2022 09:30
URI:	https://eprints.iisc.ac.in/id/eprint/65544

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