Accession Number : ADA019432

Title :   Optical Matrix-Vector Multiplication and Two-Channel Processing with Photodichroic Crystals.

Descriptive Note : Doctoral thesis,


Personal Author(s) : Bocker,Richard Perry

Report Date : 01 DEC 1975

Pagination or Media Count : 190

Abstract : This dissertation deals with two optical methods for data processing. The first method works with incoherent light. It is based on optical analog methods developed by Bromley in 1974 for performing the operations of correlation and convolution. This method yields the product of a two-dimensional matrix operator on a one-dimensional input column vector. The second method works with coherent light. The processing is performed by spatial frequency filters. The approach parallels that of Marathay, who, in 1969, laid the theoretical foundation for the realization of real bipolar and complex spatial filters for two-channel coherent optical processing using the polarization discrimination properties of Vectograph film. A photodichroic crystal was chosen for the recording medium because it has the feature that information can be recorded with light of one wavelength and nondestructively read out with light of a longer wavelength. In addition, such crystals can be recycled through many write, read, and erase operations, making them ideally suited as an active optical processing medium. This investigation shows that a single photodichroic crystal between crossed linear polarizers can be used to record real bipolar filter information. Similarly, two photodichroic crystals combined with a quarter-wave plate could be used between crossed linear polarizers for the synthesis of a complex filter.

Descriptors :   *Optical storage, Crystals, Color centers, Data processing equipment, Spatial filtering, Matrices(Mathematics), Light modulators, Electrooptics, Optical lenses, Fourier transformation, Correlators, Bipolar systems, Polarization, Theses

Subject Categories : Computer Hardware
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE