Thermal Conductivity Measurement Setup for Low Temperature Characterization of Laser Materials

Report No. ARL-TR-7120
Authors: Zachary D Fleischman and Tigran Sanamyan
Date/Pages: September 2014; 22 pages
Abstract: We have developed a setup for accurately measuring the thermal conductivity κ of solid dielectric samples in the temperature range of 20–350 K. This setup makes use of a cryogenic refrigerator and several custom fixtures that together allow for fine temperature control and low thermal losses across the sample. Initial benchmark κ measurements of an undoped single-crystal yttrium aluminum garnet (YAG) sample show good agreement with literature from cryogenic to room temperature. We present thermal conductivity results for a series of ceramic yttria samples with varying erbium (Er) concentration. These results show the expected trend of decreased thermal conductivity with increased dopant content.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2014