Abstract
We report on frequency measurements of a free-running Nd:YAG laser operating at temperatures down to 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 at has been achieved. Within a one-week measurement period, absolute frequency deviations were lower than . 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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