Accession Number:

ADA210175

Title:

Generalilzed Beamforming with Multiple Computer Originated Holograms

Descriptive Note:

Final rept. Oct 1985-Oct 1988

Corporate Author:

ENVIRONMENTAL RESEARCH INST OF MICHIGAN ANN ARBOR ADVANCED CONCEPTS DIV

Personal Author(s):

• Cederquist, J. N.
• Tai, A. M.
• Eismann, M. T.
• Stuff, M. A.
• Fienup, J. R.

Report Date:

1988-12-01

Pagination or Media Count:

99.0

Abstract:

Generalized beamforming with optical systems using multiple computer- originated holographic optical elements HOEs was studied theoretically, through computer simulations, and through fabrication and experiments. A two HOE system was built for polar formatting of spotlight synthetic aperture radar data and was used with a spatial light modulator and a third phase-correcting HOE for real-time image formation. A two HOE system was designed using a novel iterative algorithm and successfully used for energy-efficient conversion of a Gaussian beam to a uniform far-field beam. A necessary condition was derived that a one- to-one coordinate transformation must satisfy to enable it to be performed with only two optical coordinate tranformations, each using the stationary phase approximation. Because of the importance of computer-generated holograms to this work, a brief study was made of computer-generated hologram fabrication facilities. Keywords Computer generated holograms Holographic optical elements.

Descriptors:

• *LIGHT MODULATORS
• *HOLOGRAMS
• *BEAM FORMING
• *OPTICAL EQUIPMENT COMPONENTS
• OPTICAL IMAGES
• FAR FIELD
• HOLOGRAPHY
• COMPUTER APPLICATIONS
• ITERATIONS
• BEAMS(RADIATION)
• FABRICATION
• REAL TIME
• SPATIAL DISTRIBUTION
• ALGORITHMS
• COMPUTERIZED SIMULATION

Subject Categories:

• Holography
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE