Abstract

A robust laser-frequency-locking scheme to atomic transitions is proposed and demonstrated. In this scheme, dispersion of the Zeeman-shifted atoms instead of absorption in the dichroic atomic vapor laser lock (DAVLL) [Appl. Opt. 37, 3295 (1998) ] is measured and used as an error signal for stabilization feedback. The error signal of the proposed scheme can provide a wide locking range. Experimental demonstration with the transition between $5d{}^{2}D_{3∕2}$ and $6p{}^{2}P_{1∕2}$ of ${\mathrm{Ba}}^{+}$ is carried out for a grating feedback external-cavity laser diode at $650\mathrm{nm}$.

© 2009 Optical Society of America

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