Title :
High Performance Surface Grating Distributed Feedback Quantum Cascade Laser
Author :
Jinchuan Zhang ; Fengqi Liu ; Lijun Wang ; Jianyan Chen ; Shenqiang Zhai ; Junqi Liu ; Zhanguo Wang
Author_Institution :
Key Lab. of Semicond. Mater. Sci., Inst. of Semicond., Beijing, China
Abstract :
We report on the development of λ ~ 4.7 μm continuous-wave (CW) operation of surface grating distributed feedback (DFB) quantum cascade lasers (QCLs). A high wall plug efficiency (WPE) of 7% is obtained at 15°C from a single facet producing over 0.85 W of CW output power. The threshold current density of DFB QCL is as low as 1.19 kA/cm at 15°C and 2.29 kA/cm at 90°C in CW mode. Single-mode operation with side mode suppression ratio above 25 dB is observed in the working temperature of 15°-95°C.
Keywords :
diffraction gratings; distributed feedback lasers; quantum cascade lasers; continuous wave operation; distributed feedback quantum cascade laser; power 0.85 W; surface grating; temperature 15 C to 95 C; wall plug efficiency; wavelength 4.7 mum; Distributed feedback devices; Gratings; Indium phosphide; Quantum cascade lasers; Surface emitting lasers; Temperature measurement; Threshold current; Distributed feedback devices; quantum cascade lasers; semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2248081
