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Proceedings Paper

Thermal lensing characterization of a high-radiance 946nm planar waveguide laser
Author(s): S. P. Ng; J. I. Mackenzie
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Paper Abstract

We present the characterization of the in-plane thermal lens in a quasi-four-level Nd:YAG planar waveguide (PW) laser configured for high-radiance operation with an external stable-cavity. Our approach utilises the measurement of the laser's output irradiance distribution at the near- and far-field positions concurrently in order to obtain the "real time" beam propagation parameter and thus beam quality factor, M2. Coupled with the knowledge of the intra-cavity-thermal-lens- dependent beam sizes at an intra-cavity beam waist, the power dependent effective thermal lens focal length was characterized. A thermal lens focal length of >450 mm was obtained at all incident pump powers up to the maximum level of 87 W. This characterization enabled the build of a 29 W 946 nm PW laser with a record output radiance of 4.3 TWm-2sr-1.

Paper Details

Date Published: 15 May 2012
PDF: 7 pages
Proc. SPIE 8433, Laser Sources and Applications, 843303 (15 May 2012); doi: 10.1117/12.922895
Show Author Affiliations
S. P. Ng, Optoelectronics Research Ctr., Univ. of Southhampton (United Kingdom)
J. I. Mackenzie, Optoelectronics Research Ctr., Univ. of Southhampton (United Kingdom)

Published in SPIE Proceedings Vol. 8433:
Laser Sources and Applications
Thomas Graf; Jacob I. Mackenzie; Helena Jelínková; John Powell, Editor(s)

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