Generalilzed Beamforming with Multiple Computer Originated Holograms

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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1988
Accession Number
ADA210175

Entities

People

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

Organizations

  • Environmental Research Institute of Michigan

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Carrier Frequencies
  • Computer Simulations
  • Data Processing
  • Detectors
  • Differential Equations
  • Diffraction
  • Electron Beams
  • Equations
  • Fabrication
  • Fourier Transformation
  • Frequency
  • Holographic Optical Elements
  • Lasers
  • Liquid Crystals
  • Optical Modulators
  • Optical Processing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Human-Computer Interaction (HCI).
  • Phased Array Antenna Design.
  • Systems Analysis and Design