Ultrahigh-resolution spectroscopy and frequency standards in the microwave and far-infrared regions using optical lasers

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Abstract
Optically induced resonance Raman transitions in atomic and molecular beams are proposed as a means of achieving ultrahigh resolution in the microwave and far-infrared regions. Line broadening that is due to laser jitter is eliminated by correlating the frequency jitter of the two optical fields inducing the Raman transition. A Raman-separated oscillatory-field technique for reducing transit-time broadening is considered.