A diode-laser optical frequency standard based on laser-cooled Ca atoms: Sub-kilohertz spectroscopy by optical shelving detection |
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| Authors: | CW Oates F Bondu RW Fox L Hollberg |
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| Institution: | (1) National Institute of Standards and Technology, Mail Stop 847.10, 325 Broadway Boulder, CO 80303, USA, US |
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| Abstract: | We report an optical frequency standard at 657 nm based on laser-cooled/trapped Ca atoms. The system consists of a novel,
compact magneto-optic trap which uses 50 mW of frequency-doubled diode laser light at 423 nm and can trap >107 Ca atoms in 20 ms. High resolution spectroscopy on this atomic sample using the narrow 657 nm intercombination line resolves
linewidths (FWHM) as narrow as 400 Hz, the natural linewidth of the transition. The spectroscopic signal-to-noise ratio is
enhanced by an order of magnitude with the implementation of a “shelving" detection scheme on the 423 nm transition. Our present
apparatus achieves a fractional frequency instability of in 1 s with a potential atom shot-noise-limited performance of and excellent prospects for high accuracy.
Received 2 November 1998 |
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| Keywords: | PACS 32 80 Pj Optical cooling of atoms trapping - 42 55 Px Semiconductor lasers laser diodes - 42 62 Fi Laser spectroscopy |
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