OPTICAL SURVEILLANCE COMPONENT TECHNIQUES.
Abstract
The techniques and components necessary for the implementation of an optical Doppler surveillance system are discussed. Specifically, the requirements of an optical transmitter are set down. Efforts to use chelates to achieve both a gaseous narrow band oscillator and a high power amplifier are described. The description of lasering action in several chelates of europium is included with the theory of why some chelates lase and others do not. The incorporation of an oscillator and an amplifier into a transmitter is described using Nd:CaWO4 as the oscillator and Nd glass as the amplifier. Gains of 10 db were achieved in a single-pass amplifier, which is 8 inches long and pumped with 6000 joules. The problems of isolation of the oscillator and amplifier are discussed and a breadboard model of a Faraday isolator using flint glass was built with greater than 30 db isolation and less than 1 db insertion loss. In addition to the transmitter problems, the problems of optical heterodyne receiving are discussed. Measurements on mono-moding of lasers, stability and stabilizing of lasers, modulation of lasers by end reflectors variation, for both amplitude and frequency modulation are discussed. A description of a possible wide band heterodyne receiver is presented. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0612359
Entities
People
- Burt L. Cooke
- David L. Fridge
- David L. Weisman
- Mani L. Bhaumik
- Paul C. Fletcher