Terahertz imaging with self-pulsations in quantum cascade lasers under optical feedback
Terahertz imaging with self-pulsations in quantum cascade lasers under optical feedback
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DOI：
10.1063/5.0056487
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发表时间：
2021-09-01
期刊：
影响因子：
5.6
通讯作者：
Rakic, Aleksandar D. D.
中科院分区：
文献类型：
--
作者：
Qi, Xiaoqiong;Bertling, Karl;Rakic, Aleksandar D. D.
近年来报道了太赫兹量子级联激光器中由于光反馈引起的自脉冲现象。在这封信中，我们提出了一种利用太赫兹QCL中的SP现象的太赫兹成像方式。我们探索了SP方案的理论振荡特性，并证明了其在成像实验中的适用性。SP成像方案在自我检测模式下工作，不需要外部探测器。此外，该方案只需要一个固定的电流，这意味着人们可以避免与太赫兹qcl高温工作相关的许多陷阱，包括由扫描激光电流引起的频率啁啾和模式跳。这也意味着，人们可以自由地定位在最大功率的工作点，以产生所需的光束轮廓或最高的光谱纯度，这取决于应用。这项工作提出的SP成像模式可以直接转化为高温太赫兹qcl。(C) 2021作者。除另有说明外，所有文章内容均遵循知识共享署名（CC BY）许可协议
The phenomenon of self-pulsation (SP) in terahertz (THz) quantum cascade lasers (QCLs) due to optical feedback was reported recently. In this Letter, we propose a THz imaging modality using the SP phenomenon in a THz QCL. We explore the theoretical oscillation properties of the SP scheme and demonstrate its suitability to perform imaging experimentally. The SP imaging scheme operates in self-detection mode, eliminating the need for an external detector. Moreover, the scheme requires only a fixed current, meaning that one can avoid many of the pitfalls associated with high temperature operation of THz QCLs, including frequency chirp and mode hops caused by sweeping the laser current. This also means that one is free to locate the operating point at the maximum power, to produce the desired beam profile or for highest spectral purity, depending on the application. The SP imaging modality proposed in this work can be translated directly to high operating temperature THz QCLs. (C) 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license