Doppler-free frequency-modulation spectroscopy of atomic erbium in a hollow-cathode discharge cell
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The erbium atomic system is a promising candidate for an atomic Bose–Einstein condensate of atoms with a non-vanishing orbital angular momentum (L≠0) of the electronic ground state. In this paper we report on the frequency stabilization of a blue external cavity diode laser system on the 400.91 nm laser cooling transition of atomic erbium. Doppler-free saturation spectroscopy is applied within a hollow-cathode discharge tube to the corresponding electronic transition of several of the erbium isotopes. Using the technique of frequency-modulation spectroscopy, a zero-crossing error signal is produced to lock the diode laser frequency on the atomic erbium resonance. The latter is taken as a reference laser to which a second main laser system, used for laser cooling of atomic erbium, is frequency stabilized.
KeywordsErbium Probe Beam Laser Cool Reference Laser Saturation Spectroscopy
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- 7.B. Dubetsky, P.R. Berman, Laser Phys. 12, 1161 (2002) Google Scholar