Widely tunable visible pulsed cascaded Raman fiber laser source

Goswami, A and Dash, S and Deheri, R and Supradeepa, VR (2024) Widely tunable visible pulsed cascaded Raman fiber laser source. In: Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII 2024, 29 January 2024through 31 January 2024, San Francisco.

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Abstract

We have generated a visible laser by second harmonic generation from a pulsed Cascaded Raman fiber Lasers (CRFL) continuously tunable in 1060nm-1600nm, using type-I LBO. To eliminate the requirement of precise synchronization and control, we employed a passive Q-switching mechanism for the Yb laser pumping the Raman module. The pump is made continuously tunable in Yb-band with wavelength dependent feedback in the Q-switched cavity ensuring continuous wavelength tunability of generated Raman Stokes. We utilized a large mode-area amplifier to amply pulse-energy without introducing temporal instability and optimized Raman module for efficient pump conversion. We demonstrated a widely tunable visible laser with � µJ pulse-energy and � 20 - 65kHz repetition-rate, 40-200ns pulse duration. This is the first demonstration of a high pulse energy nanosecond laser continuously tunable in 530nm-600nm making it a versatile laser source for numerous biomedical applications. The wavelength tunable range can be extended to 700nm by utilizing type-II LBO. © 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 The Society of Photo-Optical Instrumentation Engineers (SPIE).
Keywords:	Conversion efficiency; Fiber amplifiers; Fibers; Frequency doublers; Medical applications; Medical imaging; Nonlinear optics; Optical pumping; Pulse repetition rate; Pulsed lasers; Q switched lasers; Q switching, Biomedical imaging; Fiber laser source; Frequency-doubling; Laser sources; Pulse energies; Raman fiber lasers; Tunables; Visible laser source; Visible lasers; Widely tunable, Fiber lasers
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	27 Aug 2024 13:31
Last Modified:	27 Aug 2024 13:31
URI:	http://eprints.iisc.ac.in/id/eprint/84856

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