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arXiv 2205.03334physics.opticsphysics.ins-det
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中红外绝对频率参考高分辨量子级联Laser双梳光谱

High-Resolution Quantum Cascade Laser Dual-Comb Spectroscopy in the Mid-Infrared with Absolute Frequency Referencing

Kenichi N. Komagata, Valentin J. Wittwer, Thomas Südmeyer, Lukas Emmenegger, Michele Gianella

摘要:

量子级联激光器(QCL)频梳以其高亮度和快速时间分辨率彻底改变了中红外(MIR)光谱学,并且是一种非常有前途的完全集成且具有成本效益的传感器技术。对于其他集成梳状光源,如微梳和带间级联激光器,QCL具有几GHz的梳间距,这足以测量宽吸收结构,通常在液体或固体样品中发现。然而,高分辨率气相光谱需要光谱交错和频率校准。我们开发了一种频率校准方案,用于快速交错测量,具有多GHz间隔的梳齿。然后,我们证明了双梳光谱与600 kHz的精度在单次拍摄54毫秒测量超过40厘米$^{-1}$使用两个QCL在7.8 $\mathrmμ$ m。这项工作是一个重要的贡献,快速指纹的复杂分子混合物中的MIR。此外,校准方案可以与用于光谱和测距的微梳一起使用,在梳扫和梳校准设置中。

英文摘要:

Quantum cascade laser (QCL) frequency combs have revolutionized mid-infrared (MIR) spectroscopy by their high brightness and fast temporal resolution, and are a promising technology for fully-integrated and cost-effective sensors. As for other integrated comb sources such as micro-combs and interband cascade laser, QCLs have a comb spacing of several GHz, which is adequate for measurements of wide absorbing structures, typically found in liquid or solid samples. However, high-resolution gas-phase spectra require spectral interleaving and frequency calibration. We developed a frequency calibration scheme for fast interleaved measurements with combs featuring multi-GHz spacing. We then demonstrate dual-comb spectroscopy with 600 kHz accuracy in single-shot 54-ms measurements over 40 cm$^{-1}$ using two QCLs at 7.8 $\mathrmμ$m. This work is an important contribution towards fast fingerprinting of complex molecular mixtures in the MIR. Moreover, the calibration scheme could be used with micro-combs for spectroscopy and ranging, both in comb-swept and comb-calibrated setups.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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