Abstract

A generator of fringes of variable frequency is described as consisting of only two Wollaston prisms W₁ and W₂ with attached polarizers P₁ and P₂. A properly oriented half-wave plate H₁ is situated between W₁ and W₂. When the two Wollaston prisms are counterrotated by an equal angle ϕ about an axis joining the geometrical centers of their faces, fringes appear of variable frequency f=4(N_e − N₀) tanα cosϕ, where α is the angle of the prisms, N_e and N₀ are the principal indices. When the fringe pattern is projected by a demagnifying microscope lens, the contrast remains constant up to 280 lines/mm.

© 1965 Optical Society of America

Interferometric Vibration Analysis by Wavefront Reconstruction

Robert L. Powell and Karl A. Stetson
J. Opt. Soc. Am. 55(12) 1593-1598 (1965)

p-Polarized Reflectances for Transparent Thin Films on Transparent Substrates

L. A. Catalán
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Optical Network Synthesis using Birefringent Crystals. II. Synthesis of Networks Containing One Crystal, Optical Compensator, and Polarizer per Stage*

E. O. Ammann and I. C. Chang
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