Abstract

It is shown that very sharp multiple-beam interference fringes can be produced with a high-power 3-mm lens of numerical aperture 0.95. The optical conditions necessary to secure high definition in the fringes are discussed. The arrangement described is used with lateral magnification of ×1500. It can resolve in extension about 0.7μ and in depth about 50 A. The technique is illustrated by topographical studies on a dodecahedron face of a diamond. The fringes obtained are much superior to the best given by high-power two-beam interference microscopes. Volume elements as small as 5×10−15 cc can be resolved.

© 1955 Optical Society of America

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