Top panel: Calculated electron and hole densities for the quaternary-ternary (QT) laser, the quaternary-binary (QB) laser, and the W laser.
Lasing spectra for the three laser sources.
Absorbed pump power vs mid-IR output power for the three laser sources.
(a) Double-ended quantum efficiency vs temperature for the three lasers. (b) Laser internal efficiency vs temperature. The results for a W laser are also shown.
Waveguide loss vs temperature for (a) the QT laser, (b) the W laser, and (c) the QB laser. The circles are from the Hakki-Paoli derived waveguide loss measurements and the squares are from the waveguide loss determined using Eq. (2).
Qualitative band-bending diagrams for the QT and QB lasers.
Small signal gain vs temperature for the QT, QB, and W. Also shown are the results for a QB structure containing 14 quantum wells in a low confinement optical waveguide, i.e., the . The was grown to provide a more directly comparable test structure to the QT and W lasers. The had the same number of QW’s and the same low confinement waveguide as the QT and W lasers. The dashed line gives the approximate gain value required to reach threshold.
SEPM-calculated small signal gain vs temperature for a 3.4- and W laser. Measured differential quantum efficiency vs temperature for the 3.4- and W lasers.
type-II quantum well lasers.
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