Abstract

Harmonics of the 3J31 magnetron (12.5-mm fundamental wavelength), dispersed by an echelette grating, are used to measure the complex index of refraction for polystyrene, for Plexiglas and for high melting paraffin. Data having 14 percent uncertainty are given for the region λ4.2 mm to λ1.8 mm, no dispersion being observed. The indices are calculated from phase angle and transmission intensity measurements which are applied to a suitable boundary value equation by means of an iteration process.

© 1953 Optical Society of America

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