A simple, compact and inexpensive pressure-tuned Fabry–Pérot interferometer is presented. It is used as a laser locking reference for optical frequencies where the use of an atomic reference is impractical. The scanning range is several GHz. Absolute positioning of the interferometer with an accuracy of 7MHz rms over a range of 2GHz is possible. The instrument is temperature stabilized and shows long-term drift of 16MHz rms over 48h.

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