The LCM-SM module is a compact fiber-coupled standalone device for laser frequency stabilization to an atomic reference transition. The error signal used to stabilize an external laser is derived from an integrated FM spectroscopy.

In addition to the miniaturised opto-mechanical setup for the Doppler-free saturation spectroscopy the module contains numerous other features like an SMD phase modulator with driver electronics, photo detection and heterodyne frequency mixing, an active T-stabilisation as well as a digital PID controller.