Haig, Henry and Bender, Nicholas and Chen, Yi-Hao and Dhar, Anirban and Choudhury, Nilotpal and Sen, Ranjan and Christodoulides, Demetrios N and Wise, Frank (2023) Gain-induced Kerr beam cleaning in a femtosecond fiber amplifier. Journal of the Optical Society of America B-Optical Physics , 40 (6). pp. 1510-1517. ISSN 0740-3224

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Abstract

Kerr beam cleaning is a nonlinear phenomenon in graded-index multimode fiber where power flows toward the fundamental mode, generating bell-shaped output beams. Here we study beam cleaning of femtosecond pulses accompanied by gain in a multimode fiber amplifier. Mode-resolved energy measurements and numerical simulations showed that the amplifier generates beams with high fundamental mode content (greater than 30% of the overall pulse energy) for a wide range of amplification levels. Control experiments using stretched pulses that evolve without strong Kerr nonlinear effects showed a degrading beam profile, in contrast to nonlinear beam cleaning. Temporal measurements showed that seed pulse parameters have a strong effect on the amplified pulse quality. These results may influence the design of future high-performance fiber lasers and amplifiers. (c) 2023 Optica Publishing Group

Item Type:	Article
Subjects:	Processing Science
Divisions:	Fiber Optics and Photonics
Depositing User:	Bidhan Chaudhuri
Date Deposited:	13 Oct 2023 08:28
Last Modified:	13 Oct 2023 08:28
URI:	http://cgcri.csircentral.net/id/eprint/5604

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