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We report on a simple and robust technique to generate a dispersive signalwhich serves as an error signal to electronically stabilize a monomode cw laseremitting around an atomic resonance. We explore nonlinear effects in the laserbeam propagation through a resonant vapor by way of spatial filtering. Theperformance of this technique is validated by locking semiconductor lasers tothe cesium and rubidiumD2 line and observing long-term reduction of theemission frequency drifts, making the laser well adapted for many atomicphysics applications.

Laser stabilization to an atomic transition using an optically generated dispersive lineshape