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) : Sherwin, Mark

PDF Url : ADA303913

Report Date : 04 OCT 1995

Pagination or Media Count : 4

Abstract : We have used the UCSB Free-Electron Lasers to study nonlinear and nonequilibrium intersubband dynamics in GaAs/AlGaAs 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

Descriptors :   *SECOND HARMONIC GENERATION, *QUANTUM WELLS, *GALLIUM ARSENIDES, *ALUMINUM GALLIUM ARSENIDES, *FAR INFRARED RADIATION, FREQUENCY, OPTICAL PROPERTIES, TUNABLE LASERS, INTERACTIONS, DYNAMICS, EXCITATION, ENERGY, STRUCTURES, VOLTAGE, SEMICONDUCTORS, NONLINEAR OPTICS, ELECTRONS, FREE ELECTRON LASERS, SHIFTING, RESONANCE, RELAXATION TIME, PHONONS, ABSORPTION.

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Radiation and Nuclear Chemistry
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE