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(a) Conduction band structure of one period of the active region calculated using a self-consistent Schrödinger-Poisson solver with a voltage drop of /stage. A 66% conduction band offset is used. Starting from the injection barrier, the layer sequence of one period, in nanometers is (from right to left): . AlGaAs layers are shown in bold and the underlined GaAs wells are doped at . The shaded area represents the lowest energy miniband. marks the second miniband. The wave function square modulus of the upper and lower laser levels are labeled as 2 and 1, respectively. (b) Voltage and emitted power as a function of current measured at different heat sink temperatures. The laser was driven in pulsed mode, with a repetition rate and a 0.3% duty cycle. This signal was modulated with a square envelope. The optical powers are corrected considering the 0.75 transmittance of the cryostat window. (c) Emission spectra from a -long, -wide laser device recorded at for different values of current pulses.
(a) Voltage vs injected current and emitted power vs current characteristics collected at a heat sink temperature , measured away from the device in continuous wave (cw). The optical powers are corrected considering the 0.75 transmittance of the cryostat window. (b) Differential resistance vs current characteristics under the same experimental conditions. The dotted vertical lines define the lasing region. (c) cw characteristics collected at , measured in close contact with the device and (d) corresponding differential resistance vs current characteristics. The shaded area marks the lasing region.
(a) Difference between the lattice temperature and the temperature of the copper holder plotted as a function of the electrical power in the active region of the device. Inset: schematics of the sample mounting and cryostat cold finger showing the position of the temperature sensors. The slope of the dashed line corresponds to the thermal resistance of the device in the region . (b) Total wall-plug efficiency plotted as a function of . The dashed line is a guide for the eye. The dotted vertical lines mark the lasing region.
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