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FM Spectroscopy With Tunable Diode Lasers

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FM Spectroscopy With Tunable Diode Lasers

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This application note is broken into two main parts. The first part explains essential elements of the physics behind FMS and certain details about the signals that are obtained. Then a simple FMS setup utilizing intensity noise cancellation is described and analyzed. The second part concerns itself with FM “saturation” spectroscopy. Saturation spectroscopy uses a setup similar to the first part, but gives much narrower signals that are free from Doppler broadening (typically the dominant source of line broadening). A short discussion of the physics of saturation spectroscopy is included. This note concludes with a reality check—a brief discussion of the most common experimental difficulties encountered.

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