Accession Number : AD0617255

Title :   THE COMPENSATION OF TWO-BEAM INTERFEROMETERS.

Descriptive Note : Instrumentation papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Steel,W. H.

Report Date : JUN 1965

Pagination or Media Count : 30

Abstract : For a two-beam interferometer, the variations of intensity in the plane of observation are given by the modulation function, which is equal to the mutual coherence function for the radiation arriving by the two separate beams. When this function is expressed in its most general form, it is found to depend on the spatial and spectral distributions of the light from the source, on any differences in the optical paths followed by the two beams, and on the states of polarization of the two beams. Hence, an interferometer can be used to measure any one of these quantities provided its influence can be separated from that of any qualtities. This separation of effects is basic to the techniques of interferometry and leads to the idea of compensation: the design of an interferometer that is insensitive to one or more of the quantities listed above. Examples are given of the compensation of interferometers for the spatial and spectral properties of the source and also for the state of polarization of the light. (Author)

Descriptors :   (*INTERFEROMETERS, BEAMS(ELECTROMAGNETIC)), LIGHT, POLARIZATION, OPTICAL IMAGES, WEDGES, GLASS, TELESCOPES

Distribution Statement : APPROVED FOR PUBLIC RELEASE