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Cryogenically-cooled Ho:YAG laser in-band pumped by a Tm fibre laser

Cryogenically-cooled Ho:YAG laser in-band pumped by a Tm fibre laser
Cryogenically-cooled Ho:YAG laser in-band pumped by a Tm fibre laser
Scaling of laser power and brightness to meet the needs of ever-demanding applications is a demanding task which continues to preoccupy many within the laser community. In conventional 'bulk' solid-state lasers the main obstacle is heat generation in the laser medium and its associated detrimental effects. Methods for combating these problems have been the focus of much research, resulting in many novel laser geometries with improved thermal management and reduced thermal lensing, but often at the expense of increased complexity and reduced flexibility. An alternative approach, which is beginning to attract a great deal of interest, is to operate the laser with the laser medium maintained at cryogenic temperatures (~77 K), where the effects of heat loading are dramatically reduced due to a large increase in thermal conductivity and a large decrease in the temperature coefficient of refractive index (dn/dT) and expansion coefficient [1]. In host materials such as YAG the net reduction in thermal effects can be over 50 times compared to operation at room temperature. In the case of diode-pumped Yb:YAG lasers, the combined effect of a massive reduction in thermo-optic aberrations and lower re-absorption loss has allowed very impressive results to be achieved in terms of output power and beam quality from relatively simple laser resonator configurations [2]. In this paper we report on preliminary work ultimately aimed at achieving a further reduction in thermal effects by combining the advantages of cryogenic cooling with a very low quantum defect fibre-laser-pumping of bulk solid-state lasers. Here we describe preliminary results for a cryogenically-cooled Ho:YAG laser in-band pumped by a high-power Tm-doped silica fibre laser.
Kim, J.W.
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Mackenzie, J.I.
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Bailey, W.O.S.
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Pearson, L.
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Shen, D.Y.
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Yang, Y.
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Clarkson, W.A.
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Kim, J.W.
43f1b0c3-5a59-4449-a56a-386668bd061a
Mackenzie, J.I.
1d82c826-fdbf-425b-ac04-be43ccf12008
Bailey, W.O.S.
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Pearson, L.
3e064e83-6545-4da7-963b-4672d5d04c12
Shen, D.Y.
f9a1bd01-6f5c-428a-83fb-3a8b2dadbaad
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2

Kim, J.W., Mackenzie, J.I., Bailey, W.O.S., Pearson, L., Shen, D.Y., Yang, Y. and Clarkson, W.A. (2009) Cryogenically-cooled Ho:YAG laser in-band pumped by a Tm fibre laser. European Conference on Lasers and Electro-Optics (CLEO/Europe-EQEC), Munich, Germany. 14 - 19 Jun 2009.

Record type: Conference or Workshop Item (Paper)

Abstract

Scaling of laser power and brightness to meet the needs of ever-demanding applications is a demanding task which continues to preoccupy many within the laser community. In conventional 'bulk' solid-state lasers the main obstacle is heat generation in the laser medium and its associated detrimental effects. Methods for combating these problems have been the focus of much research, resulting in many novel laser geometries with improved thermal management and reduced thermal lensing, but often at the expense of increased complexity and reduced flexibility. An alternative approach, which is beginning to attract a great deal of interest, is to operate the laser with the laser medium maintained at cryogenic temperatures (~77 K), where the effects of heat loading are dramatically reduced due to a large increase in thermal conductivity and a large decrease in the temperature coefficient of refractive index (dn/dT) and expansion coefficient [1]. In host materials such as YAG the net reduction in thermal effects can be over 50 times compared to operation at room temperature. In the case of diode-pumped Yb:YAG lasers, the combined effect of a massive reduction in thermo-optic aberrations and lower re-absorption loss has allowed very impressive results to be achieved in terms of output power and beam quality from relatively simple laser resonator configurations [2]. In this paper we report on preliminary work ultimately aimed at achieving a further reduction in thermal effects by combining the advantages of cryogenic cooling with a very low quantum defect fibre-laser-pumping of bulk solid-state lasers. Here we describe preliminary results for a cryogenically-cooled Ho:YAG laser in-band pumped by a high-power Tm-doped silica fibre laser.

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Published date: 14 June 2009
Venue - Dates: European Conference on Lasers and Electro-Optics (CLEO/Europe-EQEC), Munich, Germany, 2009-06-14 - 2009-06-19

Identifiers

Local EPrints ID: 78981
URI: https://eprints.soton.ac.uk/id/eprint/78981
PURE UUID: 4f3e0e90-f90f-4954-a070-900bf04e0666
ORCID for J.I. Mackenzie: ORCID iD orcid.org/0000-0002-3355-6051
ORCID for Y. Yang: ORCID iD orcid.org/0000-0002-3874-6735

Catalogue record

Date deposited: 19 Mar 2010
Last modified: 26 Nov 2019 02:03

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