Fresnel biprism

Fresnel biprism

[frā′nel ′bī‚priz·əm]
(optics)
A very flat triangular prism which has two very acute angles and one very obtuse angle; used to observe the interference of light from a slit passing through the two halves of the prism.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
GRENOUILLE (french for "frog") is a SHG FROG device that uses a Fresnel biprism to replace the beam splitter, delay line, and beam-recombining optics of the autocorrelator.