Development of Surface Grating Distributed Feedback Quantum Cascade Laser for High Output Power and Low Threshold Current Density
LIU Ying-Hui1, ZHANG Jin-Chuan1**, JIANG Jian-Min2, SUN Su-Juan2, LI Pei-Xu2, LIU Feng-Qi1**
1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 2Huaguang Optoelectronics Co. Ltd., Ji'nan 250000
Abstract：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.
. [J]. 中国物理快报, 2015, 32(02): 24202-024202.
LIU Ying-Hui, ZHANG Jin-Chuan, JIANG Jian-Min, SUN Su-Juan, LI Pei-Xu, LIU Feng-Qi. Development of Surface Grating Distributed Feedback Quantum Cascade Laser for High Output Power and Low Threshold Current Density. Chin. Phys. Lett., 2015, 32(02): 24202-024202.
2015, Vol. 32 
