Laser stabilization to an atomic transition using an optically generated   dispersive lineshape
  We report on a simple and robust technique to generate a dispersive signal which serves as an error signal to electronically stabilize a monomode cw laser emitting around an atomic resonance. We explore nonlinear effects in the laser beam propagation through a resonant vapor by way of spatial filtering. The performance of this technique is validated by locking semiconductor lasers to the cesium and rubidiumD2 line and observing long-term reduction of the emission frequency drifts, making the laser well adapted for many atomic physics applications. 
Fabiano Queiroga, Weliton Soares Martins, Valdeci Mestre, Itamar   Vidal, Thierry Passerat de Silans, Marcos Ori\'a, and Mar...
physics.atom-ph