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Holonyak, Nick, Jr. Nam, Derek Wusi 2011-05-07T13:14:25Z 2011-05-07T13:14:25Z 10000-01-01 1990 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. Made available in DSpace on 2011-05-07T13:14:25Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026278.pdf: 2489810 bytes, checksum: 681f24742ed2f8eb828e1a381f901315 (MD5) Previous issue date: 1990 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:52:09Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:23:58-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9026278 (UMI)AAI9026278 http://hdl.handle.net/2142/21630 eng Copyright 1990 Nam, Derek Wusi Engineering, Electronics and Electrical Physics, Condensed Matter Engineering, Materials Science Phonon-assisted laser operation of III-V semiconductor quantum well heterostructures text Electrical and Computer Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.