Abstract
Frequency-modulation (FM) spectroscopy is a new absorption measurement technique which features high spectral resolution, high sensitivity, and ultrafast detection speed. The key concept is based on the use Of FM light which is produced by passing the output of a single-frequency laser through an external phase modulator driven at rf frequencies. When this FM optical spectrum probes a narrow spectral feature, a net heterodyne beat signal occurs due to the distortion of the FM spectrum.
© 1981 Optical Society of America
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