Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities

Nanoscale Research Letters

Ning Zhuo¹  Li-Jun Wang¹  Jun-Qi Liu¹  Feng-Min Cheng¹  Shen-Qiang Zhai¹  Jin-Chuan Zhang¹  Chuan-Wei Liu¹  Zhan-Guo Wang¹  Yue Zhao¹  Dong-Bo Wang¹  Shu-Man Liu¹  Feng-Qi Liu¹ 

[1] Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences;

关键词: Phase locked arrays;    Quantum cascade lasers;    Semiconductor lasers;   

DOI  :  10.1186/s11671-018-2617-z

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown