AIP Digital Archive
Data are presented on a photopumped rectangular (w=40 μm, l=250 μm) quantum well heterostructure (QWH), with variable resonator Q along the sample, showing that phonon-assisted laser operation predominates. To achieve variable resonator Q, the QWH sample is heat sunk embedded in In over half of its length (reflecting edges, high Q), as opposed to simple contact with a Au shim over the remaining half and no reflecting metal on the sample edges (low Q). Photopumping at the low Q, high Q boundary near the sample center turns on and off the n=1 confined-particle recombination transition (E11 ) and sets a higher energy experimental (as well as calculated) reference, (h-dash-bar)ω2 =E11, for the lower energy phonon-assisted laser operation, (h-dash-bar)ω1 =E11 −(h-dash-bar)ωLO .
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