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Proceedings Paper

Tm:fiber laser in-band pumping a cryogenically cooled Ho:YAG laser
Author(s): J. I. Mackenzie; W. O. S. Bailey; J. W. Kim; L. Pearson; D. Y. Shen; Y. Yang; W. A. Clarkson
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Paper Abstract

Cryogenically-cooled diode-pumped lasers have received significant interest in recent years for their demonstrated orders of magnitude improvement in output radiance using simple laser resonator configurations, with respect to their room temperature counterparts. Here we present a technique that offers the potential for a further order-of-magnitude radiance improvement utilising the in-band pumping hybrid-laser architecture, which employs high-power fiber lasers to excite cryogenically-cooled bulk gain media. The ability to exploit the quasi-four-level nature of a two-level laser system at very cold temperatures enables the operation of very low quantum defect transitions, thus providing reduction in the required thermal dissipation per unit power for the in-band pumped Ho:YAG laser, compared to diode-pumped Yb:YAG. Preliminary results will be discussed for a narrow linewidth Tm:fiber laser system operating in the 100W regime, pumping a cryogenically cooled Ho:YAG gain element, and employing a simple cavity configuration. Low quantum defect operation and power-scaling potential will be discussed.

Paper Details

Date Published: 27 February 2009
PDF: 8 pages
Proc. SPIE 7193, Solid State Lasers XVIII: Technology and Devices, 71931H (27 February 2009); doi: 10.1117/12.809165
Show Author Affiliations
J. I. Mackenzie, Univ. of Southampton (United Kingdom)
W. O. S. Bailey, Univ. of Southampton (United Kingdom)
J. W. Kim, Univ. of Southampton (United Kingdom)
L. Pearson, Univ. of Southampton (United Kingdom)
D. Y. Shen, Univ. of Southampton (United Kingdom)
Y. Yang, Univ. of Southampton (United Kingdom)
W. A. Clarkson, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 7193:
Solid State Lasers XVIII: Technology and Devices
W. Andrew Clarkson; Norman Hodgson; Ramesh K. Shori, Editor(s)

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