Laser referencing system for refractively scanning interferomete

Details Laser referencing system for refractively scanning interferomete Laser referencing system for refractively scanning interferomete

1991-03-01

1992-10-13

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356345, G01B 902

Patent

active

051555514

ABSTRACT:
A laser referencing system is disclosed which is used in a refractively scanning interferometer. The interferometer optics comprise a fixed wedge-shaped prism having a beamsplitter surface, a movable wedge-shaped prism, and two corner cube reflectors. A laser clocking beam enters the interferometer on a path below the infrared analytical beam, and leaves the interferometer on a path above the infrared beam. Quadrature control of the laser beams is used to control the ends of the scanning sweeps, eliminating the need for a third, "white light" interferometer beam. ZPD alignment is accomplished by horizontal adjustment of the fixed beamsplitter prism. The interferometer optics are supported three-dimensionally in a cast shell.

REFERENCES:
patent: 4165938 (1979-08-01), Doyle
patent: 4190366 (1980-02-01), Doyle
patent: 4193693 (1980-03-01), Schindler
patent: 4265540 (1981-05-01), Doyle
patent: 4286877 (1981-09-01), Doyle

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