Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities

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

doi:10.1186/s11671-018-2617-z

Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities

Nanoscale Res Lett. 2018 Jul 9;13(1):205. doi: 10.1186/s11671-018-2617-z.

Authors

Yue Zhao^{1

2

3}, Jin-Chuan Zhang^{4

5

6}, Feng-Min Cheng^{1

2

3}, Dong-Bo Wang^{1

2

3}, Chuan-Wei Liu^{1

2

3}, Ning Zhuo^{1

2

3}, Shen-Qiang Zhai^{1

2

3}, Li-Jun Wang^{1

2

3}, Jun-Qi Liu^{1

2

3}, Shu-Man Liu^{1

2

3}, Feng-Qi Liu^{7

8

9}, Zhan-Guo Wang^{1

2

3}

Affiliations

¹ Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China.
² Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Beijing, 100083, China.
³ College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 101408, China.
⁴ Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China. zhangjinchuan@semi.ac.cn.
⁵ Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Beijing, 100083, China. zhangjinchuan@semi.ac.cn.
⁶ College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 101408, China. zhangjinchuan@semi.ac.cn.
⁷ Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China. fqliu@semi.ac.cn.
⁸ Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Beijing, 100083, China. fqliu@semi.ac.cn.
⁹ College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 101408, China. fqliu@semi.ac.cn.

Abstract

Power scaling in broad area quantum cascade laser (QCL) usually leads to the deterioration of the beam quality with an emission of multiple lobes far-field pattern. In this letter, we demonstrate a tapered QCL array integrated with Talbot cavity at one side of the array. Fundamental supermode operation is achieved in the arrays with taper straight-end connected to the Talbot cavity. Lateral far-field of the fundamental supermode shows a near diffraction limited beam divergence of 2.7^°. The output power of a five-element array is about three times as high as a single-ridge laser with an emission wavelength of around 4.8 μm. However, arrays with the taper-end connected to the Talbot cavity always show a high-order supermode operation whatever Talbot cavity length is.

Keywords: Phase locked arrays; Quantum cascade lasers; Semiconductor lasers.

Abstract

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