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Nanosecond pulsed 620 nm source by frequency-doubling a phosphosilicate Raman fiber amplifier

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Title: Nanosecond pulsed 620 nm source by frequency-doubling a phosphosilicate Raman fiber amplifier
Authors: Chandran, A
Runcorn, T
Murray, R
Taylor, J
Item Type: Journal Article
Abstract: We demonstrate a nanosecond pulsed source at 620 nm with watt-level average power by frequency-doubling a 1240 nm phosphosilicate Raman fiber amplifier. A gain-switched laser diode operating at 1064 nm is amplified in an ytterbium fiber master oscillator power amplifier system and then converted to 1240 nm using a phosphosilicate Raman fiber amplifier with a conversion efficiency of up to 66%. The Raman fiber amplifier is seeded with a continuous-wave 1240 nm laser diode to obtain narrow-linewidth radiation, which is subsequently frequency-doubled in a periodically poled lithium tantalate crystal. A maximum average power of 1.5 W is generated at 620 nm, corresponding to a pulse energy of 300 nJ at a repetition rate of 5 MHz. The source has excellent beam quality (M2≤1.16) and an optical efficiency (1064 nm to 620 nm) of 20%, demonstrating an effective architecture for generating red pulsed light for biomedical imaging applications.
Issue Date: 10-Dec-2019
Date of Acceptance: 4-Nov-2019
URI: http://hdl.handle.net/10044/1/75137
DOI: 10.1364/OL.44.006025
ISSN: 0146-9592
Publisher: Optical Society of America
Start Page: 6025
End Page: 6028
Journal / Book Title: Optics Letters
Volume: 44
Issue: 24
Copyright Statement: Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License ( https://creativecommons.org/licenses/by/4.0/ ). Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Sponsor/Funder: Medical Research Council (MRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
US Air Force
Funder's Grant Number: MR/K015834/1
Keywords: 0205 Optical Physics
0206 Quantum Physics
0906 Electrical and Electronic Engineering
Publication Status: Published
Appears in Collections:Physics
Faculty of Natural Sciences