Accession Number : ADA339045

Title :   Time Resolved Photoluminescence Spectra of a Mid-Infrared Multiple Quantum Well Semiconductor Laser

Descriptive Note : Master's thesis

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Franz, Anthony L.

PDF Url : ADA339045

Report Date : DEC 1997

Pagination or Media Count : 119

Abstract : Recombination mechanisms in mid-IR semiconductor lasers are strongly dependent on the carrier density of the active region. The objective of this research is to improve previous carrier density estimates through the incorporation of spectral information. One hundred photoluminescence (PL) spectra were calculated for a variety of carrier densities. Calculations were made for an InAsSb/InAlAsSb multiple quantum well laser sample assuming parabolic bands. The widths of the calculated spectral profiles were tabulated as a function of carrier density. Actual spectra were measured using the Ultrafast Mid-Infrared Photoluminescence System, which uses upconversion to measure the PL intensity in time steps smaller than 1 ps. PL spectra were obtained at 30 times, ranging from 100 ps to 3 ns. Spectral widths were measured and tabulated as a function of time. Combining the plot of calculated spectral width vs. carrier density with the plot of measured spectral width vs. time, we were able to describe the variation of carrier density with time. The carrier density vs. time plot thus generated agreed with earlier measurements by Cooley for low carrier densities. The discrepancy at higher carrier densities could be due to changing experimental conditions or the break down of the parabolic band approximation.

Descriptors :   *QUANTUM WELLS, *PHOTOLUMINESCENCE, *SEMICONDUCTOR LASERS, *SPECTRA, CONVERSION, DENSITY, MEASUREMENT, THESES, HOLES(ELECTRON DEFICIENCIES), LASERS, TIME, ELECTRONS, INFRARED LASERS, PROFILES, ALUMINUM, ARSENIDES, LOW DENSITY, RECOMBINATION REACTIONS, INDIUM, PLOTTING, ANTIMONIDES.

Subject Categories : Inorganic Chemistry
      Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE