Laser Phase and Frequency Stabilization using Atomic Coherence

Details Laser Phase and Frequency Stabilization using Atomic Coherence Laser Phase and Frequency Stabilization using Atomic Coherence

2012-01-10

arxiv.org/abs/1201.1985v3

Physics

Atomic Physics

6 pages, 4 figures, appendix on the derivation of Eq.(3) (transfer function of a frequency discriminator based on polarization

Scientific paper

We present a novel and simple method of stabilizing the laser phase and frequency by polarization spectroscopy of an atomic vapor. In analogy to the Pound-Drever-Hall method, which uses a cavity as a memory of the laser phase, this method uses atomic coherence (dipole oscillation) as a phase memory of the transmitting laser field. A preliminary experiment using a distributed feedback laser diode and a rubidium vapor cell demonstrates a shot-noise-limited laser linewidth reduction (from 2 MHz to 20 kHz). This method would improve the performance of gas-cell-based optical atomic clocks and magnetometers and facilitate laser cooling experiments using narrow transitions.

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