Abstract

A technique to measure the spatially resolved temperature distribution in a laser medium is presented. It is based on the temperature dependence of the absorption cross section close to the zero-phonon line of the active medium. Since other materials in the beam path exhibit a high (and constant) transmission at this wavelength, the method can easily be applied in realistic amplifier setups. The method was successfully tested on three different samples, which were pumped by a pulsed laser diode with up to 150 W average power: side-cooled Yb:YAG and Yb:fluoride-phosphate glass at room temperature and face-cooled Yb:CaF2 at 120 K.

© 2016 Optical Society of America

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Supplementary Material (3)

NameDescription
» Visualization 1: MP4 (16551 KB)      Temperature evolution in Yb:YAG.
» Visualization 2: MP4 (9134 KB)      Temperature evolution in Yb:CaF2.
» Visualization 3: MP4 (11287 KB)      Temperature evolution in FP-glass.

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