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> 30 W vortex LG₀₁ or HG₁₀ laser using a modetransforming output coupler

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Title: > 30 W vortex LG₀₁ or HG₁₀ laser using a modetransforming output coupler
Authors: Geberbauer, J
Kerridge-Johns, W
Damzen, M
Item Type: Journal Article
Abstract: High-power vortex light generated directly from lasers will help drive their applications in material processing, optical manipulation, levitation, particle acceleration, and communications, but limited power has been achieved to date. In this work, we demonstrate record vortex average power of 31.3 W directly from a laser, to the best of our knowledge, using an interferometric mode transforming output coupler to convert a fundamental mode Nd:YVO4 laser into a LG01 vortex output. The vortex laser was Q-switched with up to 600 kHz pulse rate with a high slope efficiency of 62.5% and an excellent LG01 modal purity of 95.2%. We further demonstrate > 30W laser power in a high quality HG10 mode by simple adjustment of the output coupler. Experimental investigations of varying output coupling transmission are compared with theory. This successful implementation of the interferometric output coupler in a high power system demonstrates the suitability of the mode transforming method for robust turn-key vortex lasers with high efficiency and high modal purity, with scalable power and pulse rate.
Issue Date: 25-Aug-2021
Date of Acceptance: 8-Aug-2021
URI: http://hdl.handle.net/10044/1/90956
DOI: 10.1364/oe.432674
ISSN: 1094-4087
Publisher: Optical Society of America (OSA)
Start Page: 29082
End Page: 29094
Journal / Book Title: Optics Express
Volume: 29
Issue: 18
Copyright Statement: © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. 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
Funder's Grant Number: EP/R511547/1
Keywords: 0205 Optical Physics
0906 Electrical and Electronic Engineering
1005 Communications Technologies
Optics
Publication Status: Published
Online Publication Date: 2021-08-25
Appears in Collections:Mechanical Engineering
Physics
Photonics
Faculty of Natural Sciences
Faculty of Engineering



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