Dissertation/Thesis Abstract

Terahertz local oscillator via difference frequency generation in iii-v semiconductors using frequency stabilized lasers
by Herman, Greg S., Ph.D., The University of Arizona, 2013, 154; 3601765
Abstract (Summary)

Terahertz (THz) heterodyne receiver systems are required by NASA to monitor gas concentrations related to the Earth's ozone depletion. To this end, NASA needs compact, solid state, tunable THz local oscillators. THz LOs have been developed using three means: 1) All-electronic LOs using mixers in combination with Gunn oscillators, 2) Hybrid Photo-electronic LOs using a cw analog of the Auston switch, and 3) All-photonic THz LOs using coherent sources, such as vapor lasers or solid-state Quantum Cascade Lasers, and down converting lasers using nonlinear crystals. In this dissertation, we began with two frequency stabilized Nd:YAG lasers, locked to a common reference cavity, as a starting point to having a stable input into a nonlinear optical frequency conversion system. Following this, we explored the nonlinear crystals useful for THz generation, and the phasematching schemes that could be employed by each. We concluded by settling on highly insulating III-V semiconductor crystals as the proper choice of nonlinear element, and put together a new phasematching method that is most useful for them.

Indexing (document details)
Advisor: Peyghambarian, Nasser
Commitee: Fallahi, Mahmoud, Maes, Carl, Norwood, Robert
School: The University of Arizona
Department: Optical Sciences
School Location: United States -- Arizona
Source: DAI-B 75/02(E), Dissertation Abstracts International
Subjects: Physics, Electromagnetics, Optics
Keywords: Far infrared, Frequency stability, Local oscillator, Nonlinear optics, Parametric generation, Terahertz
Publication Number: 3601765
ISBN: 978-1-303-53427-0
Copyright © 2020 ProQuest LLC. All rights reserved. Terms and Conditions Privacy Policy Cookie Policy