Abstract
The comparison of two spectral lines of almost identical wavelength can be made by recording simultaneously the output of a single spectrometer fed by two sources. The two channels are separated either through time-sharing or through modulation at two different frequencies and synchronous detection. Wavelength shifts as small as 1 mÅ have been determined for a measured shift/width ratio less than 0.05 on cesium absorption lines broadened by rare gases.
© 1971 Optical Society of America
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