Transient Gain Enhancement in Photorefractive Crystals with Two Types of Movable Charge Carriers (Preprint)

Abstract

Considerable improvement of a transient two-beam coupling gain is reported for Sn2P2S6, a photorefractive crystal that possesses two types of movable charge carriers. A gain enhancement occurs if the phase difference of the interacting beams is abruptly changed to pi;. It is also achieved with periodic phase variations between two discrete states, zero and pi, at modulation frequencies less than the smallest of two reciprocal characteristic times of space charge formation. The direct observation of gain enhancement, which is due to forced deep phase modulation, clarifies the origin of nontrivial dynamics of the coherent oscillation in Sn2P2S6 called "optical multivibrator."

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2007
Accession Number
ADA475015

Entities

People

  • A. Hryhorashchuk
  • A. Shumelyuk
  • David Evans
  • S. Odoulov

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Air Force Research Laboratories
  • Amplitude
  • Charge Carriers
  • Couplings
  • Dynamics
  • Frequency
  • Government Procurement
  • Governments
  • Military Research
  • Modulation
  • Oscillation
  • Oscillators
  • Phase Modulation
  • Space Charge
  • Steady State

Fields of Study

  • Physics

Readers

  • Calculus or Mathematical Analysis
  • Electrical Engineering
  • Optical Physics and Photonics.

Technology Areas

  • Space