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Title:Phonon-assisted laser operation of III-V semiconductor quantum well heterostructures
Author(s):Nam, Derek Wusi
Doctoral Committee Chair(s):Holonyak, Nick, Jr.
Department / Program:Electrical and Computer Engineering
Discipline:Electrical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Engineering, Electronics and Electrical
Physics, Condensed Matter
Engineering, Materials Science
Abstract:Data are presented demonstrating that the control of the edge-to-edge resonator Q across a cleaved rectangular sample is essential in identifying unambiguously photopumped phonon-assisted laser operation of Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As-GaAs quantum well heterostructures (QWHs), strained-layer Al$\sb{\rm y}$Ga$\sb{\rm 1-y}$As-GaAs-In$\sb{\rm x}$Ga$\sb{\rm 1-x}$As (x $\sim$ 0.15) QWHs, and Al$\sb{0.5}$(In$\sb{\rm x}$Ga$\sb{\rm 1-x}$)$\sb{0.5}$P (x $\sim$ 0.2) QWHs. If the QWH sample is heat sunk in metal under a sapphire window, with reflecting metal folded upward along the cleaved edges, the resonator Q across the sample is high, and laser operation across the sample on confined-particle states and along the sample on a phonon sideband is observed. If the sample edges across the sample are left uncoated (weakly reflecting, low Q), only phonon-assisted laser operation is observed. Comparison of the high-Q and the low-Q photo-excitation configurations, as well as the abrupt turn-on of laser operation in a narrow spectral range one phonon energy below the lowest confined-particle state, leads to unambiguous identification of phonon-assisted laser operation of Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As-GaAs QWHs, strained layer Al$\sb{\rm y}$Ga$\sb{\rm 1-y}$As-GaAs-In$\sb{\rm x}$Ga$\sb{\rm 1-x}$As (x $\sim$ 0.5) QWHs, and Al$\sb{0.5}$(In$\sb{\rm x}$Ga$\sb{\rm 1-x}$)$\sb{0.5}$P (x $\sim$ 0.2) QWHs.
Issue Date:1990
Type:Text
Language:English
URI:http://hdl.handle.net/2142/21630
Rights Information:Copyright 1990 Nam, Derek Wusi
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9026278
OCLC Identifier:(UMI)AAI9026278


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