WIDE BAND COHERENT LIGHT MODULATOR

Abstract

A thorough analysis is made of the theoretical factors affecting Fabry-Perot interferometers containing electro-optical crystals as phase-shifting elements and used as wideband modulators of coherent light. Bandwidth, modulation percentage and distortion, optical transmission, the effect of optical imperfections and modulator amplifier characteristics are discussed. Descriptions of two experimental modulators based on the results of this analysis are included. The design of a wideband distributed amplifier to drive the final modulator is discussed. The characteristics of this modulator were investigated at low frequencies with a mercury vapor light source and at frequencies up to 30 megacycles with a continuous gas laser operating at 6328 angstroms. Results of final tests indicate a modulation sensitivity one third of that expected, but a flat pass band out to 30 megacycles. It is suggested that direct experimental verification of the transmission functions and maximum modulation frequencies be made.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1963
Accession Number
AD0421838

Entities

People

  • A. Quesada
  • H. Raterink
  • S. Marcus
  • S. Schiller
  • V. Del Piano

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Angle Of Incidence
  • Delay Lines
  • Doppler Effect
  • Electron Tubes
  • Figure Of Merit
  • Frequency
  • Lasers
  • Light Sources
  • Measurement
  • Modulation
  • Modulators
  • Optics
  • Photomultiplier Tubes
  • Probability
  • Probability Distributions
  • Refractive Index

Fields of Study

  • Physics

Readers

  • Microwave Engineering.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy