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Bandstructure and the moduli squared of the relevant wave functions for one out of periods under an applied electric field of 33 kV/cm. The layer sequence of one active cell, given in nanometers and starting from the injector barrier of (a) the two-phonon resonance design is and (b) the bound-to-continuum design is , where InAlAs barriers are in bold face, InGaAs wells are shown in normal face, and numbers underlined correspond to the -doped layers (Si, ).
(a) Experimental and (b) theoretical lineshape of the two-phonon resonance design.
Theoretical and experimental linewidth vs bias at different temperature of (a) the two-phonon resonance and (b) the bound-to-continuum design. In order to avoid superluminescence, we cleaved very short lasers and measured the spontaneous emission perpendicular to the waveguide.
LIV-curves of the two-phonon resonance (solid line) and the bound-to-continuum (dashed) QC laser measured in pulsed operation (200 ns, 99 kHz) for different temperatures. The setups’ collection efficiency of 74% is not corrected in this plot.
Theoretical and experimental values of (a) differential gain, (b) threshold current density, and (c) slope efficiency of the bound-to-continuum (BTC) and two-phonon resonance (2Ph) design. The setups’ collection efficiency was taken into account.
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