Vortex laser by transforming Gaussian mode with an interferometric output coupler

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Title: Vortex laser by transforming Gaussian mode with an interferometric output coupler
Authors: Kerridge-Johns, W
Geberbauer, JWT
Damzen, M
Item Type: Journal Article
Abstract: Generation of vortex beams directly from the laser source can be limited in power and efficiency, or to specific pump sources and gain media. Here, we propose a new high power and high efficiency vortex laser methodology with interferometric mode transformation as output coupling, which uses high power handling and low loss optics that have wavelength versatility. Experimental demonstration is made in a diode-pumped Nd:YVO4 laser using an imbalanced Sagnac interferometer as output coupler producing high quality vortex output beams (M2 = 2.07) with fully selectable control of handedness whilst the intracavity mode is maintained as a fundamental Gaussian. Vortex output power >3W is produced with only small reduction in efficiency compared to the equivalent TEM00 laser. Continuous variation of vortex output coupling transmission and the quality of the vortex is investigated experimentally showing good agreement with theory. This work reveals a new approach to high power structured laser radiation direct from the source through interferometric spatial mode transformations.
Issue Date: 15-Apr-2019
Date of Acceptance: 3-Apr-2019
URI: http://hdl.handle.net/10044/1/70068
DOI: https://dx.doi.org/10.1364/OE.27.011642
ISSN: 1094-4087
Publisher: Optical Society of America (OSA)
Start Page: 11642
End Page: 11650
Journal / Book Title: Optics Express
Volume: 27
Issue: 8
Copyright Statement: © 2019 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
Funder's Grant Number: EP/R511547/1
Keywords: Science & Technology
Physical Sciences
0205 Optical Physics
1005 Communications Technologies
0906 Electrical and Electronic Engineering
Publication Status: Published
Appears in Collections:Mechanical Engineering
Faculty of Natural Sciences

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