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Two-micron cryogenically-cooled solid-state lasers: recent progress and future prospects

Two-micron cryogenically-cooled solid-state lasers: recent progress and future prospects
Two-micron cryogenically-cooled solid-state lasers: recent progress and future prospects
Efficient powerful laser sources in the two-micron regime are in demand for many applications in the areas of remote-sensing, defence, medicine, and materials interactions. Dramatic progress has been demonstrated in cw-power scaling of 2-micron fibre lasers; however, power-scaling in a pulsed mode of operation is limited by nonlinear effects and a relatively low damage-threshold-power. To fully capitalise on the potential advantage for high pulse-energies of the conventional 'bulk' 2-micron solid-state laser, extreme measures have to be taken to mitigate the three-level character and thermal effects in the laser medium resulting from heat generated during the pump cycle. Alleviation of these detrimental effects can be achieved by simply cooling the gain medium to cryogenic temperatures, benefitting from lower population in the terminal laser levels, and a large increase in the thermal conductivity, with a proportional decrease in the thermo-optic coefficient (dn/dT) and expansion coefficient. Combined these result in a massive reduction in thermo-optic aberrations. In this paper, we report on improved measurements of the spectroscopic properties of Ho:YAG at various temperatures between room and liquid nitrogen (LN) temperatures, utilising a multi-Watt Tm:fibre ASE source we have been able to properly identify the absorption features of interest with an accuracy better than 0.2nm. Results for other Ho-doped gain media will be discussed and the latest performance of a cooled 2-micron Ho:YAG laser in-band pumped by a narrow-linewidth Tm fibre laser presented.
7578F
Mackenzie, J.I.
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Kim, J.W.
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Pearson, L.
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Bailey, W.O.S.
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Yang, Y.
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Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
Mackenzie, J.I.
1d82c826-fdbf-425b-ac04-be43ccf12008
Kim, J.W.
43f1b0c3-5a59-4449-a56a-386668bd061a
Pearson, L.
3e064e83-6545-4da7-963b-4672d5d04c12
Bailey, W.O.S.
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2

Mackenzie, J.I., Kim, J.W., Pearson, L., Bailey, W.O.S., Yang, Y. and Clarkson, W.A. (2010) Two-micron cryogenically-cooled solid-state lasers: recent progress and future prospects. SPIE 7578 Photonics West 2010 : Solid State Lasers XIX: Technology and Devices. 23 - 28 Jan 2010. 7578F . (doi:10.1117/12.842132).

Record type: Conference or Workshop Item (Paper)

Abstract

Efficient powerful laser sources in the two-micron regime are in demand for many applications in the areas of remote-sensing, defence, medicine, and materials interactions. Dramatic progress has been demonstrated in cw-power scaling of 2-micron fibre lasers; however, power-scaling in a pulsed mode of operation is limited by nonlinear effects and a relatively low damage-threshold-power. To fully capitalise on the potential advantage for high pulse-energies of the conventional 'bulk' 2-micron solid-state laser, extreme measures have to be taken to mitigate the three-level character and thermal effects in the laser medium resulting from heat generated during the pump cycle. Alleviation of these detrimental effects can be achieved by simply cooling the gain medium to cryogenic temperatures, benefitting from lower population in the terminal laser levels, and a large increase in the thermal conductivity, with a proportional decrease in the thermo-optic coefficient (dn/dT) and expansion coefficient. Combined these result in a massive reduction in thermo-optic aberrations. In this paper, we report on improved measurements of the spectroscopic properties of Ho:YAG at various temperatures between room and liquid nitrogen (LN) temperatures, utilising a multi-Watt Tm:fibre ASE source we have been able to properly identify the absorption features of interest with an accuracy better than 0.2nm. Results for other Ho-doped gain media will be discussed and the latest performance of a cooled 2-micron Ho:YAG laser in-band pumped by a narrow-linewidth Tm fibre laser presented.

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More information

e-pub ahead of print date: 17 February 2010
Additional Information: ISSN 0277-786X
Venue - Dates: SPIE 7578 Photonics West 2010 : Solid State Lasers XIX: Technology and Devices, 2010-01-23 - 2010-01-28

Identifiers

Local EPrints ID: 78894
URI: https://eprints.soton.ac.uk/id/eprint/78894
PURE UUID: 014df9c5-936c-4404-9b8b-c8c625a6efaf
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

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Date deposited: 17 Mar 2010
Last modified: 20 Jul 2019 01:21

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Contributors

Author: J.I. Mackenzie ORCID iD
Author: J.W. Kim
Author: L. Pearson
Author: W.O.S. Bailey
Author: Y. Yang ORCID iD
Author: W.A. Clarkson

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