Development of Surface Grating Distributed Feedback Quantum Cascade Laser for High Output Power and Low Threshold Current Density

  • Revised Date: January 19, 2015
  • Published Date: January 19, 2015
  • We report on the room-temperature cw operation of a surface grating distributed feedback (DFB) quantum cascade laser (QCL) at λ~4.7 μm. 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-μm-wide and 4-mm-long laser, high wall-plug efficiency of 6% is obtained at 20°C from a single facet producing over 1 W of cw output power. The threshold current density of DFB QCL is as low as 1.13 kA/cm2 at 10°C and 1.34 kA/cm2 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°C.
  • Article Text

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