Abstract
We report a diode laser system developed for narrow-line cooling and trapping on the 1 S 0–3 P 1 intercombination transition of neutral strontium atoms. Doppler cooling on this spin-forbidden transition with a line width of Γ/2π=7.1 kHz enables us to achieve sub-μK temperatures in a two-step cooling process. The required reduction of the laser line width to the kHz level was achieved by locking the laser to a tunable Fabry–Pérot cavity. The long-term drift (>0.1 s) of the reference cavity was compensated by employing the saturated absorption signal obtained from Sr vapor in a heat pipe of novel design. We demonstrate the potential of the system by performing spectroscopy of Sr atoms confined to the Lamb–Dicke regime in a one-dimensional optical lattice.
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32.80.Pj; 39.30.+w; 42.55.Px
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Li, Y., Ido, T., Eichler, T. et al. Narrow-line diode laser system for laser cooling of strontium atoms on the intercombination transition. Appl. Phys. B 78, 315–320 (2004). https://doi.org/10.1007/s00340-004-1405-x
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DOI: https://doi.org/10.1007/s00340-004-1405-x