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Continuous-wave optical output power from the uncoated facet vs the driving current for temperatures between 288 and . Over of cw power is recorded just below room temperature. Also shown is the characteristic at . The inset illustrates the typical cw emission spectrum near threshold at with an emission peak at .
Average power for HR-coated QCLs measured at a constant heat sink temperature of . The inset shows the threshold current density as a function of heat sink temperature for HR-coated QCLs in cw and pulsed operation. The dashed line indicates a fit from the normal exponential function, .
Maximum cw operating temperature as a function of for the devices in Ref. 10 and this letter. The stars represent the of each device based on the measured , , and values. The bold sections of each curve between the two black squares illustrate the values that fall in the range of values predicted by the thermal model presented in this letter.
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