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Nonlinear optical properties of quantum well structures in the presence of intense infared lasers Sadeghi, Seyed Mostafa
Abstract
We theoretically and experimentally investigate the non-linear optical properties of undoped and n-doped quantum wells (QW's) in the presence of intense infrared lasers. These lasers are polarized along the QW growth directions and near resonance with the transitions between the conduction subbands. In n-doped QW's by inclusion of electronelectron scattering and dynamic screening we study for the first time: (i) the effects of the frequencies and intensities of the infrared fields on the dephasing rates associated with the intersubband transitions, (ii) the generation of various nonlinear gain processes, and (iii) coherent and optical processes such as coherent population trapping, dark line and laser induced transparency effects. In undoped QW's by presenting a consistent theory we show how one can use infrared coupling of the conduction subbands of a QW to coherently manipulate absorption and emission spectra of excitons. We discuss these effects in.terms of multi-photon coupling of the excitons or electrons, quantum interferences, and by presenting a new model to treat laser-matter interaction. Following these developments we put some of our own results to test by observing the emission dynamics of excitons in the presence of an intense CO2 laser. We report the first observations of infrared enhancement of the effective non-radiative decay rates of excitons and the effects of multi-level transition processes in the emission of QW's. This thesis also includes an extensive analysis of nonlinear effects in atomic systems. While the primary motivation for this analysis was to understand and design nonlinear optics of QW's, in the process some original contributions were made to the study of nonlinear optics of atomic systems.
Item Metadata
| Title |
Nonlinear optical properties of quantum well structures in the presence of intense infared lasers
|
| Creator | |
| Publisher |
University of British Columbia
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| Date Issued |
1999
|
| Description |
We theoretically and experimentally investigate the non-linear optical properties of undoped
and n-doped quantum wells (QW's) in the presence of intense infrared lasers.
These lasers are polarized along the QW growth directions and near resonance with the
transitions between the conduction subbands. In n-doped QW's by inclusion of electronelectron
scattering and dynamic screening we study for the first time: (i) the effects of
the frequencies and intensities of the infrared fields on the dephasing rates associated
with the intersubband transitions, (ii) the generation of various nonlinear gain processes,
and (iii) coherent and optical processes such as coherent population trapping, dark line
and laser induced transparency effects. In undoped QW's by presenting a consistent
theory we show how one can use infrared coupling of the conduction subbands of a QW
to coherently manipulate absorption and emission spectra of excitons. We discuss these
effects in.terms of multi-photon coupling of the excitons or electrons, quantum interferences,
and by presenting a new model to treat laser-matter interaction. Following these
developments we put some of our own results to test by observing the emission dynamics
of excitons in the presence of an intense CO2 laser. We report the first observations of
infrared enhancement of the effective non-radiative decay rates of excitons and the effects
of multi-level transition processes in the emission of QW's. This thesis also includes an
extensive analysis of nonlinear effects in atomic systems. While the primary motivation
for this analysis was to understand and design nonlinear optics of QW's, in the process
some original contributions were made to the study of nonlinear optics of atomic systems.
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| Extent |
12396633 bytes
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| Genre | |
| Type | |
| File Format |
application/pdf
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| Language |
eng
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| Date Available |
2009-07-03
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| Provider |
Vancouver : University of British Columbia Library
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| Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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| DOI |
10.14288/1.0085488
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| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
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| Graduation Date |
1999-11
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| Campus | |
| Scholarly Level |
Graduate
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| Aggregated Source Repository |
DSpace
|
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.