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Simple electronic device for intermodulation techniques. Application to high-resolution laser spectroscopy in molecular beams

A simple experimental set-up useful for intermodulation techniques is described. Its experimental details and conditions as well as its application to high-resolution laser induced fluorescence in sodium beams are reported. The major advantages of the present technique include its simplicity (low cost) and enhanced signal-to-noise ratio resulting in significantly improved frequency resolution when using a non-stabilized laser system.