Observation of phonon-assisted laser operation of AlxGa1-xAs-GaAs quantum well heterostructures

Holonyak, N.; Nam, D. W.; Plano, W. E.; Vesely, E. J.; Hsieh, K. C.
March 1989
Applied Physics Letters;3/13/1989, Vol. 54 Issue 11, p1022
Academic Journal
Data are presented showing that the key to observing the phonon-assisted photopumped laser operation of narrow rectangular samples of AlxGa1-xAs-GaAs quantum well heterostructures (QWHs) is the control of the edge-to-edge resonator Q across the sample. If the sample is heat sunk in metal, with metal reflectors folded upward along the edges, the resonator Q across the sample is high, and laser operation across the sample on confined-particle states (a reference) and along the sample a phonon lower in energy (ΔE≊hωLO) is observed. If the sample edges across the sample are left uncoated (weakly reflecting, low Q), laser operation is observed only along the sample (longitudinal modes) but shifted (ΔE≊hωLO) below the confined-particle states and absorption. A QWH rectangle, with proper heat sinking and control of its edge-to-edge resonator Q, can act as a hot-phonon ‘‘spectrometer’’ if it is fully photopumped across its width and is only partially pumped along its length.


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