Interferometer light source

Details Interferometer light source Interferometer light source

1999-01-26

2000-05-09

Kim, Robert H.

Optics: measuring and testing

By particle light scattering

With photocell detection

356353, G01B 902

Patent

active

060611332

ABSTRACT:
A low coherent noise interferometer system incorporates an improved low spatial coherence source obtained from a laser light source which supplies a beam of light through a beam-shaping lens to the first one of a set of two cascaded diffusers. One of the diffusers is dynamically changing, provided by a rotating ground glass disk. The diffusers then supply light to an interferometer of a two-beam interferometer configuration, such as Fizeau, Twyman-Green or Mach-Zehnder. In one embodiment, the first diffuser is the rotating ground glass diffuser and the second diffuser is a multi-mode optical fiber. The exit face of the fiber represents the spatially incoherent extended light source for the interferometer. The laser, the motor for driving the first diffuser and the diffusers themselves all are mounted on a separate base from the base on which the interferometer is mounted.

REFERENCES:
patent: 4201473 (1980-05-01), Domenicali
patent: 4869593 (1989-09-01), Biegen
patent: 5357341 (1994-10-01), Kuchel
patent: 5737081 (1998-04-01), Freischlad
Fourier Description of Digital Phase Measuring Interferometry--Freischlad & Kolopoulos, U. of A., Nov. 18, 1989.
Speckle Removal by . . . , Lowenthal & Joyeaux, Journal of the Optical Society of America, vol. 61, No. 7 Jul. 1971.

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