Absolute frequency stabilization of a diode laser to cesium atom-molecular hyperfine transitions via modulating molecules

Abstract

We have demonstrated a robust method of directly stabilizing diode laser frequency to the cesium atom-molecular hyperfine transitions. The trap loss fluorescence spectroscopy was applied to yield the error signal based on modulating molecules with ultralow modulation frequency of 1.2 Hz. The excursions over 300 s of the frequency of the laser were bounded by 1.5 MHz. The root of Allan variance of the error signals reached a minimum of 4.8× 10-11 for an averaging time of 100 s. © 2007 American Institute of Physics.