Abstract
The automatic control of the spacing of Fabry–Perot interferometers to transmit at a given wavelength is discussed, and an interferometer is described in which the plates are maintained parallel to within the accuracy of the plates themselves and at a preset spacing. The variation in mean spacing over test periods of several hours has not exceeded ± 0.7 nm despite temperature fluctuations and other uncontrolled environmental conditions.
© 1966 Optical Society of America
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