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Looks at a study which focused on high-power continuous-wave laser action for a quantum cascade structure. How gain optimization and reduced heating effects were achieved; Methodology used to conduct the study; Results of the study.

High performance index-coupled quantum cascade distributed feedback (QC-DFB) lasers operating at λapprox. 8.5 μm are reported. Reliable dynamic single-mode emission with a side mode suppression ratio >=30 dB is obtained. The continuous single-mode tuning range is 140 nm. In pulsed operation a record high peak output power of 60 mW at 300 K is achieved. We further report on the first continuous-wave QC-DFB lasers. These devices display an output power of 10 mW at 120 K. [ABSTRACT FROM AUTHOR]