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Circular output from a high power Nd:YLF slab laser

Circular output from a high power Nd:YLF slab laser
Circular output from a high power Nd:YLF slab laser
Neodymium-doped Yttrium Lithium Fluoride (YLF) lasers have traditionally been power-limited by the relatively low tensile strength of the crystal. When power-scaling solid-state lasers, the choice of the gain media geometry, the doping level, and the pumping scheme is dictated by minimizing the impact of thermally induced stress. To date the slab architecture has been the most successful for scaling the average-power of Nd:YLF lasers due to its favorable thermal management. However, for efficient high-radiance laser action it is also necessary to have a good overlap between the cavity mode and the planar gain volume. We present the performance characteristics for an end-pumped slab-laser utilizing a stable low-loss resonator configuration that transforms a circular cavity mode at the output coupler into a very high aspect ratio elliptical beam in the slab gain element to match the pumped volume. The optical arrangement for transforming the beam shape is also suitable for a double-pass slab amplifier configuration. A polarized CW output power of 50W, on the weaker Nd:YLF 1053nm transition was obtained with a single slab gain element and 110W of incident pump power from three spatially multiplexed diode bars. Laser threshold was around 7W and the slope efficiency, with respect to incident power, 46%.
9780819470461
1-8
Mackenzie, J.I.
1d82c826-fdbf-425b-ac04-be43ccf12008
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
Mackenzie, J.I.
1d82c826-fdbf-425b-ac04-be43ccf12008
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2

Mackenzie, J.I. and Clarkson, W.A. (2008) Circular output from a high power Nd:YLF slab laser. SPIE 6871 : Photonics West. 19 - 24 Jan 2008. pp. 1-8 . (doi:10.1117/12.759662).

Record type: Conference or Workshop Item (Paper)

Abstract

Neodymium-doped Yttrium Lithium Fluoride (YLF) lasers have traditionally been power-limited by the relatively low tensile strength of the crystal. When power-scaling solid-state lasers, the choice of the gain media geometry, the doping level, and the pumping scheme is dictated by minimizing the impact of thermally induced stress. To date the slab architecture has been the most successful for scaling the average-power of Nd:YLF lasers due to its favorable thermal management. However, for efficient high-radiance laser action it is also necessary to have a good overlap between the cavity mode and the planar gain volume. We present the performance characteristics for an end-pumped slab-laser utilizing a stable low-loss resonator configuration that transforms a circular cavity mode at the output coupler into a very high aspect ratio elliptical beam in the slab gain element to match the pumped volume. The optical arrangement for transforming the beam shape is also suitable for a double-pass slab amplifier configuration. A polarized CW output power of 50W, on the weaker Nd:YLF 1053nm transition was obtained with a single slab gain element and 110W of incident pump power from three spatially multiplexed diode bars. Laser threshold was around 7W and the slope efficiency, with respect to incident power, 46%.

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e-pub ahead of print date: 2008
Venue - Dates: SPIE 6871 : Photonics West, 2008-01-19 - 2008-01-24

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Local EPrints ID: 50692
URI: https://eprints.soton.ac.uk/id/eprint/50692
ISBN: 9780819470461
PURE UUID: 9a7dbb2a-ae68-4c15-b20b-3f86bd97e78b
ORCID for J.I. Mackenzie: ORCID iD orcid.org/0000-0002-3355-6051

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Date deposited: 19 Mar 2008
Last modified: 26 Nov 2019 01:52

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Author: J.I. Mackenzie ORCID iD
Author: W.A. Clarkson

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