Development of diode and fiber laser sources for a Sr+ trapped-ion optical frequency standard

Geoffrey P. Barwood; C. S. Edwards; Patrick Gill; Hugh A. Klein; W. R.C. Rowley

doi:10.1117/12.143700

30 April 1993 Development of diode and fiber laser sources for a Sr⁺ trapped-ion optical frequency standard

Geoffrey P. Barwood, C. S. Edwards, Patrick Gill, Hugh A. Klein, W. R.C. Rowley

Author Affiliations +

Proceedings Volume 1837, Frequency-Stabilized Lasers and Their Applications; (1993) https://doi.org/10.1117/12.143700
Event: Applications in Optical Science and Engineering, 1992, Boston, MA, United States

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 ²S_1/2 - ²P_1/2 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 ²D_3/2 metastable state remove ions from the cooling cycle. This loss was prevented by driving the 1092 nm ²D_3/2 - ²P_1/2 transition using a Nd³⁺-doped fiber laser, diode-pumped at 826 nm. The ²S_1/2 - ²D_5/2 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.

Citation Download Citation

Geoffrey P. Barwood, C. S. Edwards, Patrick Gill, Hugh A. Klein, and W. R.C. Rowley "Development of diode and fiber laser sources for a Sr⁺ trapped-ion optical frequency standard", Proc. SPIE 1837, Frequency-Stabilized Lasers and Their Applications, (30 April 1993); https://doi.org/10.1117/12.143700

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