Optical Waveguide Lenses. II.
Abstract
The results of an effort to further improve thin-film waveguide lens elements for implementation of the optical Fourier transform as may be employed for real-time RF spectral analysis is delineated. Thin-film waveguide positive inhomogeneous refractors identified as generalized Luneberg lenses were investigated calculating the performance and demonstrating their operation with quantitative measurement of the diffraction patterns. They were assembled as inverting beam expanders and lenses were used with retroreflectors for folding. The effort included the demonstration of waveguide coupled photodetector arrays for application in the spatial frequency plane of the transform lens. Charge coupled readout mechanization of the detectors was demonstrated. A numerical procedure was developed to compute the performance of thin-film waveguide generalized Luneberg lenses and lens systems. Using the waveguide lens thickness profile, ray traces through the inhomogeneous lens can be determined together with the ray intercept in the image plane to provide wavefront phase error to determine the resulting intensity diffraction pattern. The procedure allows the introduction of various waveguide thickness profile errors.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1977
- Accession Number
- ADA044207
Entities
People
- D. B. Anderson
- J. T. Boyd
- R. L. Davis
- R. R. August
- W. H. Southwell