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Highly efficient nanosecond 560 nm source by SHG of a combined Yb-Raman fiber amplifier

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Title: Highly efficient nanosecond 560 nm source by SHG of a combined Yb-Raman fiber amplifier
Authors: Runcorn, TH
Murray, R
Taylor, JR
Item Type: Journal Article
Abstract: We demonstrate a nanosecond 560 nm pulse source based on frequency-doubling the output of a combined Yb-Raman fiber amplifier, achieving a pulse energy of 2.0 µJ with a conversion efficiency of 32% from the 976 nm pump light. By introducing a continuous-wave 1120 nm signal before the cladding pumped amplifier of a pulsed Yb:fiber master oscillator power amplifier system operating at 1064 nm, efficient conversion to 1120 nm occurs within the fiber amplifier due to stimulated Raman scattering. The output of the combined Yb-Raman amplifier is frequency-doubled to 560 nm using a periodically poled lithium tantalate crystal with a conversion efficiency of 47%, resulting in an average power of 3.0 W at a repetition rate of 1.5 MHz. The 560 nm pulse duration of 1.7 ns and the near diffraction-limited beam quality (M2≤1.18) make this source ideally suited to biomedical imaging applications such as optical-resolution photoacoustic microscopy and stimulated emission depletion microscopy.
Issue Date: 19-Feb-2018
Date of Acceptance: 2-Feb-2018
URI: http://hdl.handle.net/10044/1/56820
DOI: https;//dx.doi.org/10.1364/OE.26.004440
ISSN: 1094-4087
Publisher: Optical Society of America (OSA)
Start Page: 4440
End Page: 4447
Journal / Book Title: Optics Express
Volume: 26
Issue: 4
Copyright Statement: © 2018 The Author(s). Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Medical Research Council
US Air Force
Funder's Grant Number: EP/K503733/1
Keywords: Science & Technology
Physical Sciences
0205 Optical Physics
1005 Communications Technologies
0906 Electrical And Electronic Engineering
Publication Status: Published
Appears in Collections:Physics
Faculty of Natural Sciences