Reference interferometer with variable wavelength and folded mea

Details Reference interferometer with variable wavelength and folded mea Reference interferometer with variable wavelength and folded mea

1996-06-20

1998-02-03

Turner, Samuel A.

Optics: measuring and testing

By polarized light examination

With birefringent element

356358, G01B 902

Patent

active

057150575

ABSTRACT:
The invention is directed to a reference interferometer with variable wavelength, with an interferometer splitter, a reference beam path, and a folded measurement beam path passing between two plane mirrors. At least one spacer element 10 is provided for realizing a fixed position of the plane mirrors relative to one another. The two plane mirrors are arranged in a plurality of planes in a defined manner in relation to one another such that a light beam coming from the interferometer splitter and coupled into the space between the plane mirrors at an entrance point at a slight angle is reflected repeatedly at the plane mirrors, and the reflection points lie along a parabola on the surfaces of the plane mirrors. A retroreflector is arranged downstream of the first plane mirror in such a way that the light beam striking it can be returned to the entrance point or in the vicinity thereof along the same path or almost the same path.

REFERENCES:
"Laser Pressure Guage", Measurement and Control, Nov. 1964, vol. 3, No. 11.

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