Linewidth control of cascaded Raman fiber lasers for visible conversion

Dash, S and Deheri, R and Supradeepa, VR (2024) Linewidth control of cascaded Raman fiber lasers for visible conversion. In: Fiber Lasers XXI: Technology and Systems 2024, 29 January 2024 through 1 February 2024, San Francisco.

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Abstract

Cascaded Raman Fiber Lasers (CRFL) are a versatile source for achieving power in Near-Infrared (NIR) wavelengths, spanning from 1 to 1.9 µm. This is due to transfer of power from the pump to successive Stokes using cascaded Raman conversion. Frequency doubling the output of such widely tunable CRFLs can generate tunable visible lasers from green to red and beyond. But conventional CRFLs have broad linewidths due to the broad Raman gain, which limits the power and efficiency of nonlinear conversion to visible wavelengths. Only a fraction of NIR power is converted to visible, so linewidth control of the generated Stokes is desired. To address this issue, a custom feedback mechanism is used that combines broadband feedback at all wavelengths with filtered feedback at a desired wavelength. This mechanism allows for linewidth control of CRFLs up to the 6th order of Stokes shift and can potentially be extended further till �2 µm, limited by loss and zero dispersion wavelength (ZDWL) in Raman fiber. The result is significantly reduced linewidths from �4-5 nm to <1 nm along with multi-watt class output, as well as fine tuning of wavelength within the Stokes band using a fixed wavelength pump. As proof of concept, over 100 mW of visible power at 557 nm is generated through frequency doubling of the 1st Stokes along with wavelength tunability. © 2024 SPIE.

Item Type:	Conference Paper
Publication:	Proceedings of SPIE - The International Society for Optical Engineering
Publisher:	SPIE
Additional Information:	The copyright for this article belongs to SPIE.
Keywords:	Fiber lasers; Fibers; Frequency doublers; Infrared devices; Linewidth, Cascaded raman fiber laser; Frequency-doubling; Line-width control; Near-infrared wavelength; Power; Raman conversion; Raman fiber lasers; Tunable feedback; Tunables; Wavelength tunability, Feedback
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	27 Aug 2024 13:18
Last Modified:	27 Aug 2024 13:18
URI:	http://eprints.iisc.ac.in/id/eprint/84853

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