Temperature Dependence of a Diode-pumped Cryogenic Erbium (Er):Yttrium Aluminum Garnet (YAG) Laser

Report No. ARL-TR-4885
Authors: Larry D. Merkle, Nikolay Ter-Gabrielyan, G. Alex Newburgh, Arockiasamy Michael, and Mark Dubinskii
Date/Pages: July 2009; 32 pages
Abstract: We report the laser performance of resonantly diode-pumped erbium (Er):yttrium aluminum garnet (YAG) from liquid nitrogen temperature to above room temperature. Relative to incident pump power, the best performance was observed at approximately 160 K. Spectroscopy and modeling show that this is due primarily to the changing efficiency of diode pump absorption as the absorption lines broaden with temperature. However, the physics of the Er:YAG system indicates that even with an arbitrarily narrow pump linewidth the most efficient laser performance should occur at a temperature somewhat above 77 K. The causes of the temperature dependence are at least qualitatively understood.
Distribution: Approved for public release
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Last Update / Reviewed: July 1, 2009