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60-W cryogenically-cooled Nd:YAG 946 nm laser

60-W cryogenically-cooled Nd:YAG 946 nm laser
60-W cryogenically-cooled Nd:YAG 946 nm laser
Cryogenic-cooling has proved to be an efficient way of power-scaling solid-state lasers, thanks to the enhancement of spectroscopic and thermo-optical properties of the gain media. We have investigated the absorption cross section of Nd:YAG at cryogenic temperatures via a small-signal measurement method, enabling the determination of the analogous dependence of the Energy Transfer Upconversion (ETU) macroparameter, via a z-scan technique. These results were key to establishing that, while at Room Temperature (RT) the 946 nm quasi-four-level transition of Nd:YAG is essentially limited by low gain and detrimental thermal effects exacerbated by ETU, for cryogenic cooling of the gain crystal, an overall improvement in laser performance, despite an increase in the ETU coefficient, is obtained. In-band-pumped by a diode-laser, locked to 869 nm via
a volume-Bragg-grating, we demonstrate a 60-W 946 nm laser with a 50% conversion efficiency.
Lasers, cryogenic cooling, Neodymium, Absorption, Upconversion
Cante, Silvia
153acbb4-d6d1-4f3e-ada7-1be8b5b94c8f
Mackenzie, Jacob
1d82c826-fdbf-425b-ac04-be43ccf12008
Cante, Silvia
153acbb4-d6d1-4f3e-ada7-1be8b5b94c8f
Mackenzie, Jacob
1d82c826-fdbf-425b-ac04-be43ccf12008

Cante, Silvia and Mackenzie, Jacob (2018) 60-W cryogenically-cooled Nd:YAG 946 nm laser. Siegman School of Lasers, Hven, Sweden. 28 Jul - 04 Aug 2018. 1 pp . (In Press)

Record type: Conference or Workshop Item (Poster)

Abstract

Cryogenic-cooling has proved to be an efficient way of power-scaling solid-state lasers, thanks to the enhancement of spectroscopic and thermo-optical properties of the gain media. We have investigated the absorption cross section of Nd:YAG at cryogenic temperatures via a small-signal measurement method, enabling the determination of the analogous dependence of the Energy Transfer Upconversion (ETU) macroparameter, via a z-scan technique. These results were key to establishing that, while at Room Temperature (RT) the 946 nm quasi-four-level transition of Nd:YAG is essentially limited by low gain and detrimental thermal effects exacerbated by ETU, for cryogenic cooling of the gain crystal, an overall improvement in laser performance, despite an increase in the ETU coefficient, is obtained. In-band-pumped by a diode-laser, locked to 869 nm via
a volume-Bragg-grating, we demonstrate a 60-W 946 nm laser with a 50% conversion efficiency.

Text
Poster - Author's Original
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More information

Accepted/In Press date: 18 May 2018
Venue - Dates: Siegman School of Lasers, Hven, Sweden, 2018-07-28 - 2018-08-04
Keywords: Lasers, cryogenic cooling, Neodymium, Absorption, Upconversion

Identifiers

Local EPrints ID: 427985
URI: https://eprints.soton.ac.uk/id/eprint/427985
PURE UUID: fbde248e-0e5c-4701-b803-4d3365863490
ORCID for Silvia Cante: ORCID iD orcid.org/0000-0002-5981-0855
ORCID for Jacob Mackenzie: ORCID iD orcid.org/0000-0002-3355-6051

Catalogue record

Date deposited: 06 Feb 2019 17:30
Last modified: 14 Mar 2019 01:47

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