Abstract

For very high precision molecular spectroscopy we use a tunable diode laser which is frequency locked to an internally coupled Fabry-Perot interferometer (icFPI). The spectra are calibrated by means of the interference pattern of an iodine stabilized He–Ne reference laser which is simultaneously coupled into the icFPI. In this paper the exact relation between the diode laser frequency and the He–Ne fringe number is derived and a convenient calibration procedure yielding a frequency accuracy of 5 × 10−5 cm−1 at 10 μm is described.

© 1989 Optical Society of America

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