Abstract
A combined infrared–optical frequency-standard scheme has been demonstrated with a single ion of ytterbium. The optical reference transition at 411 nm and the infrared transition were driven sequentially. The structure of the infrared reference transition at has also been studied. Infrared transition linewidths of 300 kHz were observed. The output of a Nd:YAG laser and an extended-cavity diode laser were difference-frequency mixed in a crystal of to produce narrow-linewidth light at . Both lasers were frequency stabilized to high-finesse reference cavities.
© 1998 Optical Society of America
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