Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1994-08-04
1996-06-25
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
359818, 359819, 359827, G01B 902
Patent
active
055305474
ABSTRACT:
The present invention is directed to an apparatus for aligning optical elements and a method used to test aspheric components using a conventional interferometer. The apparatus comprises an optical mount having a base and a mount plate used for adjustably mounting an optical element. The mount plate is adjustable relative to the base and includes an assembly surface and several side surfaces. The base is attachable to a bench, table, rail, or the like. An optical element, such as a pre-aligned alignment CGH, is positioned within a first frame, which in turn is releasably coupled to the mount plate. The interferometer generates a spherical test beam which is diffracted by the reflective alignment CGH to create an interferogram. The mount plate is adjusted relative to the base to diffract the test beam onto itself, thus producing null interference fringes. The alignment CGH is removed from the mount plate and a second optical element, such as a CGH null compensator fixed to a second frame, is releasably coupled to the mount plate in place of the alignment CGH, without adjusting the position of the mount plate, such that the spherical test beam from the interferometer is diffracted as it passes through the CGH null compensator to form a prescribed aspheric wavefront for testing aspheric components.
REFERENCES:
patent: 4281895 (1981-08-01), Mohr
patent: 5097280 (1992-03-01), Nomura
patent: 5140470 (1992-08-01), Luecke
"An interferometer for testing of general aspherics using computer generated holograms", by Steven M. Arnold and Anil K. Jain, vol. 1396, 27-28 Sep. 1990.
Diffraction International, "CGH Null Adaptor", 1993, Bulletin 1300.
Diffraction International, "CGH Photomasks", 1993.
Diffraction International, "Binary Optics", 1993, Bulletin 1100.
Diffraction International, "CGH Frames And Mounts," Bulletin 1200.
APA Optics, "Interferometer for aspheric Testing Using Computer Generated Holograms," Jan. 1992.
Kim Robert
Turner Samuel A.
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