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Electronic distribution in superlattice quantum cascade lasers
1.F. Capasso, C. Gmachl, A. Tredicucci, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, Opt. Photonics News 10, 31 (1999).
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8.For the In mole fractions, we used the values and assessed by x-ray diffraction and Raman scattering characterizations. These values, slightly different from lattice matched ones, correspond to a practically negligible 0.3% strain.
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11.The samples were processed into 150-μm-diam mesas with alloyed ohmic contacts. The substrate was wedged at 45° to facilitate light collection. The devices, indium soldered onto copper holders and mounted into a closed-cycle He cryostat with ZnSe windows, were voltage driven at 40 kHz with 50% duty cycle. Midinfrared electroluminescence spectra were collected with an FTIR spectrometer operating in the step scan and lock-in mode, using ZnSe optics and a cooled HgCdTe detector.
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