Abstract

We demonstrate a technique for locking the frequency of a tunable diode laser to a ring-cavity resonator. The resonator is stabilized to a diode laser that is in turn locked to an atomic transition in rubidium, thus giving it absolute frequency calibration. The principal advantage of the ring-cavity design is that there is no feedback destabilization of the laser. The cavity has a free-spectral range of 1.3 GHz and Q of ∼35, which provides robust locking of the laser. The locked laser is able to track large scans of the cavity.

© 2004 Optical Society of America

Frequency-stabilized 1520-nm diode laser with rubidium 5S_1/2 → 7S_1/2 two-photon absorption

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