Fig. 2 Light-Current-Voltage (L-I-V) characteristic of an ICL array with 3 emitters in CW operation at the heat sink temperature of 10oC.
Figure 3 compares the WPE versus current curves measured from a single emitter and a three-emitter array at 10℃, respectively. The two curves overlap when the injection current densities are lower than 500 A/cm2, and deviate slightly as the current density increases. For the single emitter sample, the maximum WPE and the WPE at the maximum current are 15% and 13.6%, respectively. These values are only 0.6% higher than that of the 3-emitter array sample, indicating efficient heat extraction from the