| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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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
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| Cite this article: |
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LIU Ying-Hui, ZHANG Jin-Chuan, JIANG Jian-Min et al 2015 Chin. Phys. Lett. 32 024202 |
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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.
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Published: 20 January 2015
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