Abstract
The use of multiple-beam interferometry makes it possible to observe very small deviations in the flatness of optical surfaces. A method is described which reduces the contour interval between multiple beam fringes to between 1/20 and 1/100 wavelength. This method has been applied to the critical examination of a quantity of Fabry-Perot plates for use in continuous helium-neon optical masers.
© 1961 Optical Society of America
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