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(a) Power-current-voltage, and (b) WPE-current behavior of BA QCLs with different ridge widths operating in pulsed mode at room temperature. All devices have the same cavity length of 3 mm and they are epilayer-up bonded to copper heatsinks. The testing duty cycle was 0.2% with a pulse width of 200 ns. Device facets were uncoated and the output power was collected from one facet and doubled to give the total.
Spectra of the BA QCLs measured near threshold under pulsed mode operation at room temperature.
Far field of the BA QCLs measured at both low current and high current in pulsed mode operation at room temperature. The simulated far field curves are based on sinusoidal near fields with a proper mode number as labeled.
Power-current-voltage characterization of a BA QCL with a ridge width of and a cavity length of 4 mm in pulsed mode operation at room temperature. The back facet is HR coated and the measured peak power is from the front facet only. The testing duty cycle is 0.2% with a pulse width of 200 ns. The inset shows the far field measured near threshold.
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