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cw voltage (solid, black), light (dash, red), and WPE (dot-dash, blue) vs current curves for the high efficiency device at a heat sink temperature of 80 K. The power and WPE values are reported for both facets.
Threshold current vs heat sink temperature data of the high efficiency device for cw (red circles) and pulsed (blue squares) operation. The inset shows the thermal resistance calculated from the difference in threshold currents vs temperature.
Light vs pulsed current for measurements below (blue) and above (red) cw threshold. The blue and red arrows show the direction of the increase in the magnitude of the current pulses below and above cw threshold, respectively. The inset shows a schematic of the current pulses supplied to the device in addition to the dc current. The lasing threshold is indicated for both measurements.
Plot of core temperature vs dc input power. The blue squares are for the experimental results; the blue, solid line is for calculations including the WPE; and the red, dashed line is for calculations with zero WPE for all input powers. The power corresponding to cw threshold, , is marked by the vertical, dashed line. There is excellent agreement between experiment and the calculations; the only free parameter is the initial core temperature, which was matched to the experiment.
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