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Frequency characteristics of an inherently stable Nd:YAG laser operated at liquid helium temperature

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Abstract

We report on frequency measurements of a free-running Nd:YAG laser operating at temperatures down to 6.5K using a femtosecond laser frequency comb. Due to lower thermal expansion and thermo-optic effects as well as reduced electron–phonon interactions in Nd:YAG at cryogenic temperatures, a laser frequency stability on the order of 1011 at τ30s has been achieved. Within a one-week measurement period, absolute frequency deviations were lower than 1.85MHz. This is up to a 100-fold improvement of frequency stability compared to any existing free-running solid-state laser.

© 2009 Optical Society of America

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