Calculated energetically resolved electron concentration and modulus square of 19 Wannier-Stark states for the central period. The upper and lower panels correspond, respectively, to low and high biases.
(Color online) Top: Experimental modal gain estimated by transmission data as for TM polarization. Gradually increased losses for the energies below about 160 meV indicate the long-wavelength transmission edge for the laser waveguide. Bottom: Calculated material gain . In experiments the temperature was 10 K for zero and low current and approximately 80 K for the highest current.
(Color online) Calculated and measured current-voltage characteristic. While the voltage in the simulation is defined as the voltage drop per period times the number of periods, the experimental values include the voltage drop over the contact regions as well. For small biases the calculated currents are not sufficiently precise for a reasonable display on a logarithmic scale.
Spatial resolved gain for a low bias (top panel) and a high bias (bottom panel). Below 100 meV there is extremely strong absorption (on this scale) in the injector region. The conduction band profile in the plot is merely for spatial orientation, while its energy is arbitrary. In the bottom panel, the region around the gain transition is rescaled; white (black) corresponds to .
(Color online) Calculated spectrum for 1030 mA with different number of Wannier states. The gain peak height is correctly described by the 14 states included in the transport simulation, while the high-energy absorption changed drastically when adding more high-energy states.
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