| 摘 要： | We report on the design and fabrication of λ~7.2μm distributed feedback quantum cascade lasers for very high temperature cw operation and low electrical power consumption.The cw operation is reported above 90℃.For a 2-mm-long and 10-μm-wide laser coated with high-reflectivity on the rear facet,more than 170 mW of output power is obtained at 20℃ with a threshold power consumption of 2.4 W,corresponding to 30 mW with a threshold power consumption of 3.9 W at 90℃.Robust single-mode emission with a side-mode suppression ratio above 25 dB is continuously tunable by the heat sink temperature or injection current.
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