Phonon-assisted laser operation of III-V semiconductor quantum well heterostructures
Nam, Derek Wusi
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Permalink
https://hdl.handle.net/2142/21630
Description
Title
Phonon-assisted laser operation of III-V semiconductor quantum well heterostructures
Author(s)
Nam, Derek Wusi
Issue Date
1990
Doctoral Committee Chair(s)
Holonyak, Nick, Jr.
Department of Study
Electrical and Computer Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Physics, Condensed Matter
Engineering, Materials Science
Language
eng
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.
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