High power tungstate-crystal Raman laser operating in the strong thermal lensing regime

Aaron McKay; Ondrej Kitzler; Richard P. Mildren

doi:10.1364/OE.22.000707

High power tungstate-crystal Raman laser operating in the strong thermal lensing regime

Aaron McKay, Ondrej Kitzler, Richard P. Mildren

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9 Citations (Scopus)

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Abstract

We report an investigation into a double metal tungstate Raman laser when pumped at elevated average powers. Potassium gadolinium tungstate (KGW) was placed in an external cavity configured for second-Stokes output and pumped at pulse repetition rate of 38 kHz with up to 46 W of average power. For output powers above 3 W, we observe preferential excitation of Hermite-Gaussian transverse modes whose order in the X₁' principal direction of the thermal expansion tensor scales linearly with Raman power. We deduce that strong astigmatic thermal lensing is induced in the Raman crystal with a negative component in the X₁' direction. At maximum pump power, 8.3 W of output power was obtained at a conversion efficiency of 18%.

Original language	English
Pages (from-to)	707-715
Number of pages	9
Journal	Optics Express
Volume	22
Issue number	1
DOIs	https://doi.org/10.1364/OE.22.000707
Publication status	Published - 13 Jan 2014

Bibliographical note

This paper was published in Optics express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-1-707. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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abstract = "We report an investigation into a double metal tungstate Raman laser when pumped at elevated average powers. Potassium gadolinium tungstate (KGW) was placed in an external cavity configured for second-Stokes output and pumped at pulse repetition rate of 38 kHz with up to 46 W of average power. For output powers above 3 W, we observe preferential excitation of Hermite-Gaussian transverse modes whose order in the X1' principal direction of the thermal expansion tensor scales linearly with Raman power. We deduce that strong astigmatic thermal lensing is induced in the Raman crystal with a negative component in the X1' direction. At maximum pump power, 8.3 W of output power was obtained at a conversion efficiency of 18{\%}.",

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