Accession Number:

ADB005227

Title:

Real-Time Optical Data Modulator

Descriptive Note:

Final rept. Oct 1973-Nov 1974

Corporate Author:

ENVIRONMENTAL RESEARCH INST OF MICHIGAN ANN ARBOR

Report Date:

1975-05-01

Pagination or Media Count:

92.0

Abstract:

Analysis of the performance characteristics of a laboratory model real-time thermoplastic optical data modulator was accomplished. Design of the modulator was performed in a previous program. Experimental data for bandwidth, dynamic range, spatial resolution and optical quality were obtained indicating a level of performance suitable for entry of wideband, high dynamic range data into a coherent optical processor or optical computer, or use of the modulator as a large screen display device. The thermoplastic modulator provides electron beam writing on a reusable deformable thermoplastic surface giving a two- dimensional optical phase recording which may be rapidly erased upon command. Data written on the plastic surface may be retained for arbitrary lengths of time down to a minimum of about 100 milliseconds, prior to erasure. A 70 MHz temporal bandwidth, 30 cmm spatial bandwidth and a recording dynamic range of at least 40 db were realized. The experimental modulator system was designed in two configurations which differed mainly in the thermoplastic recording surface geometry.

Subject Categories:

  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE