Abstract

A combined infrared–optical frequency-standard scheme has been demonstrated with a single ion of ytterbium. The optical S21/2D25/2 reference transition at 411 nm and the infrared F27/2D25/2 3.43µm transition were driven sequentially. The structure of the infrared F27/2D25/2 reference transition at 3.43 µm 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 AgGaS2 to produce narrow-linewidth light at 3.43 µm. Both lasers were frequency stabilized to high-finesse reference cavities.

© 1998 Optical Society of America

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