Abstract
We describe our system for frequency calibrating high resolution laser induced fluorescence spectra. The system utilizes two diode lasers that are spectrally narrowed with optical feedback from external resonators. One laser acts as a reference and is locked to a cesium transition with an external resonator containing a vapor cell in a Faraday filter configuration. Additional electronic feedback fixes the length of the resonator. The second laser receives its feedback from a confocal optical cavity and has the capability of scanning over several hundred megahertz. A portion of the scanning-laser output excites cesium atoms in a thermal atomic beam producing a fluorescence signal. Portions of each laser output are combined on a fast photo diode that produces a heterodyne signal. A counter reads the RF beat note between the laser frequencies and provides the frequency calibration.
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