Accession Number:

ADA303913

Title:

Far-Infrared Low-and High-Order Harmonic Generation in GaAs/AlGaAs Quantum Wells.

Descriptive Note:

Final rept. 5 Aug 92-4 Aug 95,

Corporate Author:

CALIFORNIA UNIV SANTA BARBARA QUANTUM INST

Personal Author(s):

Report Date:

1995-10-04

Pagination or Media Count:

4.0

Abstract:

We have used the UCSB Free-Electron Lasers to study nonlinear and nonequilibrium intersubband dynamics in GaAsAlGaAs semiconductor heterostructures at Terahertz frequencies. We have observed extremely large voltage-tunable resonant optical nonlinearities in quantum wells, which can be successfully modeled by self-consistent theory which includes the electron-electron interactions. We have performed definitive measurements of the intersubband relaxation time for quantum wells with energy level spacings below the LO phonon energy. Finally, we have observed the collective intersubband absorption in a quantum well to shift from its dressed energy towards its undressed energy on excitation with intense Terahertz radiation. jg p1

Subject Categories:

  • Physical Chemistry
  • Inorganic Chemistry
  • Radiation and Nuclear Chemistry
  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE