Accession Number:

ADD012192

Title:

Picosecond Bistable Optical Switch Using Two-Photon Transitions.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Report Date:

1985-12-17

Pagination or Media Count:

9.0

Abstract:

This patent discloses a bistable optical switch comprising a Fabry Perot resonator containing a nonlinear semiconductor medium with a desired band structure and whose susceptibility refractive index varies with optical energy density. The Fabry-Perot resonator is biased to a point where two stable transmission states are possible. Switching is accomplished by pumping the nonlinear material with an energy hw in the range 12 to 1 of the bandgap between the upper valence band and the conduction band of the nonlinear material, in order to stimulate a two photon valence to conduction band absorption transition at a non minimum energy and thereby make possible a one-hw photon virtual transition between the heavy hole and split-off valence bands of the nonlinear material. This virtual transition alters the susceptibility thereby switching the resonator to a different stable transmission state. Switching times on the order of picoseconds are obtained because switching time is not dependent on the carrier recombination time.

Subject Categories:

  • Optics
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE