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We report on the room-temperature cw operation of a surface grating distributed feedback(DFB) quantum cascade laser(QCL) at λ~4.7μm.Both grating design and material optimization are used to decrease the threshold current density and to increase the output power.For a high-reflectivity-coated 13-~m-wide and 4-mm-long laser,high wall-plug efRciency of 6%is obtained at 20℃ from a single facet producing over IWofcw output power.The threshold current density of DFB QCL is as low as 1.13kA/cm~2 at 10℃ and 1.34kA/cm~2 at30℃ in cw mode.Stable single-mode emission with a side-mode suppression ratio of about 30 dB is observed in the working temperature range of 20-50℃.
We report on the room-temperature cw operation of a surface grating distributed feedback (DFB) quantum cascade laser (QCL) at λ ~ 4.7μm.Both grating design and material optimization are used to decrease the threshold current density and to increase the output power . For a high-reflectivity-coated 13- ~ m-wide and 4-mm-long laser, high wall-plug efRciency of 6% is obtained at 20 ° C from a single facet producing over IWofcw output power. DFB QCL is as low as 1.13 kA / cm ~ 2 at 10 ° C and 1.34 kA / cm ~ 2 at 30 ° C in cw mode.Stable single-mode emission with a side-mode suppression ratio of about 30 dB is observed in the working temperature range of 20-50 ℃.