Grumman Aerospace Corporation

Stephen J Caputi

Benjamin J Pernick

Nils J Fonneland

Robert W Brandstetter

John V Fine, Sr

Douglas S Hobbs

John V Fine

A system and method is presented for obtaining optical phase and amplitude measurements utilizing an acousto-optical modulator for modulating a laser light beam with a multifrequency electrical signal to form an image that is Fourier transformed and spatially distributed proportional to the frequency components of the electrical signal. An optical component such as a spatial light modulator is located in the Fourier plane and the modulated image is inversely transformed and optically heterodyned to produce a transformed image. The transformed image impinges a photodetector that produces an electrical output signal that is inputted to a network analyzer to measure phase and amplitude of the transformed image. The electrical output signal is compared with a reference signal and deviations from the reference signal provide a quantitative measurement of the phase and amplitude response of the spatial light modulator.

Optical heterodyning system and method for rapid optical phase and

Method of fabricating a coherently exposed multiple holographic lens including a first step of fabricating an incoherently exposed master multiple holographic lens with an array of overlapping holographic lens elements, each of said lens elements having an interference pattern substantially covering the entire area of the lens. The master multiple holographic lens is illuminated with a first beam of light from a coherent source to provide a plurality of light waves equal in number to the number of lens elements in the master lens. The plurality of light waves overlap in a region downstream of the master lens. A holographic recording medium is positioned in the region of overlap such that an area thereon is illuminated simultaneously by each of the plurality of light waves. A second beam of light from a coherent source is directed toward the area of the holographic recording medium illuminated by the plurality of light waves. The holographic recording medium is exposed simultaneously to the second beam of light and the plurality of light waves and is developed to form a coherently exposed multiple holographic lens. A larger area of overlap of the plurality of light waves illuminating to recording medium is provided by an imaging lens positioned to capture and redirect the waves. A one to one image of the master lenses can be recorded by positioning a pair of imaging lens between the master lens and the recording meidum.

Method of fabricating a multiple holographic lens

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Centerport, NY, United States of America

Stephen J Caputi