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Proceedings Paper

Development of diode and fiber laser sources for a Sr+ trapped-ion optical frequency standard
Author(s): Geoffrey P. Barwood; C. S. Edwards; Patrick Gill; Hugh A. Klein; W. R.C. Rowley
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Paper Abstract

The development of an all-solid-state systems of lasers is described for the cooling and probing of strontium ions in a radio-frequency (rf) trap. The Sr+ ions created within the rf trap are laser cooled by repeated cycling on the 422 nm 2S1/2 - 2P1/2 resonance transition. The 422 nm light was generated from a single mode 70 mW 844 nm diode laser, whose output was frequency doubled to 422 nm in a KNbO3 crystal inside a resonant enhancement cavity. Decays from the Sr+ upper resonance level into the 2D3/2 metastable state remove ions from the cooling cycle. This loss was prevented by driving the 1092 nm 2D3/2 - 2P1/2 transition using a Nd3+-doped fiber laser, diode-pumped at 826 nm. The 2S1/2 - 2D5/2 optical 'clock' transition at 674 nm has a natural linewidth of 0.4 Hz and may be probed with an AlGaInP laser diode. The laser diodes at 844 nm and 674 nm are both collimated using a piezo-mounted GRIN rod which also provides longitudinal mode selection. The spectral output is optically narrowed using resonant optical feedback.

Paper Details

Date Published: 30 April 1993
PDF: 7 pages
Proc. SPIE 1837, Frequency-Stabilized Lasers and Their Applications, (30 April 1993); doi: 10.1117/12.143700
Show Author Affiliations
Geoffrey P. Barwood, National Physical Lab. (United Kingdom)
C. S. Edwards, National Physical Lab. (United Kingdom)
Patrick Gill, National Physical Lab. (United Kingdom)
Hugh A. Klein, National Physical Lab. (United Kingdom)
W. R.C. Rowley, National Physical Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 1837:
Frequency-Stabilized Lasers and Their Applications
Y. C. Chung, Editor(s)

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