The three wave mixing process was modeled in GaAs:AlGaAs superlattices using two new
modeling tools that were developed in the course of this work: A 2D beam propagation
tool for optimizing quasi-phase matching gratings, and a 1D iterative beam propagation
tool for determining the output powers and threshold of optical parametric oscillators
of arbitrary geometries. The 2D tool predicts close to 80% enhancement of conversion
e ciency by phase matching near 800 nm compared to 775 nm, which was the originally
designed operation wavelength. The model also predicts resonant behaviour for an abrupt
grating pro le. The 1D tool was used to determine the threshold conditions for para-
metric oscillation for di erent geometries. The performances of di erent phase matching
approaches in AlGaAs were quantitatively compared. The model also indicated the need
for pulsed operation to achieve reasonably low threshold powers in AlGaAs waveguides.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/25801 |
| Date | 11 January 2011 |
| Creators | Sigal, Iliya |
| Contributors | Helmy, Amr S., Aitchison, J. Stewart |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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