A Michelson interferometer of fixed-path difference, capable of scanning over
only one fringe, has been shown to be useful for the measurement of Doppler
shifts from isolated emission lines. It is straightforward to field widen this
type of configuration, but if different wavelengths are to be selected, the
field widening must be achromatic. Further, for Doppler shift measurement, one
requires a path difference that is highly stable with respect to temperature.
The generalized requirements for meeting all these conditions are set out and a
configuration that satisfies them is described. Sample characteristics are given
for a number of different systems.
© 1985 Optical Society of America
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