Zhao Yue, Zhang Jin-Chuan, Cheng Feng-Min, Wang Dong-Bo, Liu Chuan-Wei, Zhuo Ning, Zhai Shen-Qiang, Wang Li-Jun, Liu Jun-Qi, Liu Shu-Man, Liu Feng-Qi, Wang Zhan-Guo
Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China.
Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Beijing, 100083, China.
Nanoscale Res Lett. 2018 Jul 9;13(1):205. doi: 10.1186/s11671-018-2617-z.
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.
宽区域量子级联激光器（QCL）中的功率缩放通常会导致光束质量恶化，并产生多瓣远场图案发射。在本信函中，我们展示了一种在阵列一侧集成塔尔博特腔的锥形QCL阵列。通过将锥形直端连接到塔尔博特腔，在阵列中实现了基模超模运转。基模超模的横向远场显示出约2.7的近衍射极限光束发散角。一个五元阵列的输出功率约为发射波长约4.8μm的单脊激光器的三倍。然而，无论塔尔博特腔长度如何，将锥形端连接到塔尔博特腔的阵列总是呈现高阶超模运转。
