Demonstration of High-Power and Stable Single-Mode in a Quantum Cascade Laser Using Buried Sampled Grating

Feng-Min Cheng; Jin-Chuan Zhang; Dong-Bo Wang; Zeng-Hui Gu; Ning Zhuo; Shen-Qiang Zhai; Li-Jun Wang; Jun-Qi Liu; Shu-Man Liu; Feng-Qi Liu; Zhan-Guo Wang

doi:10.1186/s11671-019-2954-6

Demonstration of High-Power and Stable Single-Mode in a Quantum Cascade Laser Using Buried Sampled Grating

Nanoscale Res Lett. 2019 Apr 3;14(1):123. doi: 10.1186/s11671-019-2954-6.

Authors

Feng-Min Cheng^{1

2}, Jin-Chuan Zhang³, Dong-Bo Wang^{1

2}, Zeng-Hui Gu^{1

2}, Ning Zhuo⁴, Shen-Qiang Zhai¹, Li-Jun Wang^{1

2}, Jun-Qi Liu^{1

2}, Shu-Man Liu^{1

2}, Feng-Qi Liu^{1

2}, Zhan-Guo Wang^{1

2}

Affiliations

¹ Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083, China.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
³ Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083, China. zhangjinchuan@semi.ac.cn.
⁴ Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083, China. zhuoning@semi.ac.cn.

Abstract

High-power, low-threshold stable single-mode operation buried distributed feedback quantum cascade laser by incorporating sampled grating emitting at λ ~ 4.87 μm is demonstrated. The high continuous wave (CW) output power of 948 mW and 649 mW for a 6-mm and 4-mm cavity length is obtained at 20 °C, respectively, which benefits from the optimized optical field distribution of sampled grating. The single-mode yields of the devices are obviously enhanced by controlling cleaved positions of the two end facets precisely. As a result, stable single-mode emission and mode tuning linearly without any mode hopping of devices are obtained under the different heat sink temperatures or high injection currents.

Keywords: Distributed feedback; Quantum cascade laser; Sampled grating.

Abstract

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