| 单模太赫兹半导体激光器高精度调谐特性研究 |
| High precision frequency tuning of single mode terahertz semiconductor laser |
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| 中文摘要: |
| 大量物质的特征吸收谱在太赫兹范围内，因此近年来太赫兹光谱应用的发展备受关注。相比于现有的商业光谱仪，基于可调谐单模激光器的光谱测量方法具有高精度和高光谱获取速度的优势。太赫兹量子级联激光器是可调谐激光源的理想选择。在利用其实现光谱测量前，需对其调谐特性进行研究，但是现有测量方法受到精度限制。研究发现，利用太赫兹量子级联光频梳和单模激光器之间的拍频，可在微波波段得到对应的拍频信号。当调谐单模激光器时，拍频信号会发生相应的频移。因此，结合量子级联激光器的自探测，利用频谱分析仪测量拍频信号的频移情况，可以实现对单模激光器调谐的高精度测量。最终得到所测太赫兹单模激光器的调谐速率为53 MHz/K（温度调谐）和2.7 MHz/mA（电流调谐）。 |
| 英文摘要: |
| The characteristic absorption spectra of a large number of substances are in the terahertz range, so the development of terahertz spectroscopy applications has attracted much attention in recent years. Compared to existing commercial spectrometers, spectral measurement methods based on tunable single-mode lasers offer the advantages of high accuracy and high spectral acquisition speed. Terahertz quantum cascade laser (QCL) is an ideal candidate for tunable laser sources. Its tuning characteristics need to be studied before it can be used to achieve spectral measurements, but the existing measurement methods are limited by accuracy. The study finds that the corresponding beatnote signals can be obtained in the microwave band by beating the terahertz quantum cascade optical frequency comb and the single-mode laser. When the single-mode laser is tuned, the beatnote signals shift accordingly. Therefore, combined with the self-detection technology of QCLs, the tuning coefficient of the single mode laser can be measured with high precision by measuring the microwave beatnote signals using a spectrum analyzer. The resulting coefficient of the measured terahertz single-mode laser were 53 MHz/K (temperature tuning) and 2.7 MHz/mA (current tuning). |
| 作者 | 单位 | | 管玟1,2, 李子平1, 马旭红1,3, 王晨捷1,3, 万文坚1, 曹俊诚1,3, 黎华1,3 | 1.中国科学院上海微系统与信息技术研究所,上海 200050
2.上海科技大学,上海 201210
3.中国科学院大学,北京 100049 |
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| 中文关键词: 太赫兹 量子级联激光器 外差探测 |
| 英文关键词:terahertz QCL heterodyne detection |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2022.05.12 |
| 引用本文：管玟, 李子平, 马旭红, 王晨捷, 万文坚, 曹俊诚, 黎华.单模太赫兹半导体激光器高精度调谐特性研究[J].计测技术,2022,(5):. |
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