Dataset for Gas spectroscopy with integrated frequency monitoring through self-mixing in a terahertz quantum-cascade laser.

This archive contains the dataset associated with the publication entitled 'Gas spectroscopy with integrated frequency-monitoring through self-mixing in a terahertz quantum-cascade laser';. In this work, we demonstrate a gas spectroscopy technique based on self-mixing interferometry in a 3.4-THz quantum-cascade laser (QCL). All previous QCL spectroscopy techniques have required additional THz instrumentation (detectors, mixers or spectrometers) for system-precalibration or in situ spectral analysis. By contrast, our system self-calibrates the laser frequency to a precision of 630 MHz (0.02%) by analyzing voltage perturbations across the QCL, in response to optical feedback from a mirror mounted on a 0-800-mm round-trip delayline. We demonstrate spectroscopy of methanol by introducing a gas cell into the feedback path, and show that a limiting absorption coefficient of ~0.0001 /cm is resolvable. This dataset includes the raw data used to generate all figures within the publication.

本存档包含与题为《太赫兹量子级联激光器自混合集成频率监测气体光谱学》的学术论文配套的数据集。本研究展示了一种基于3.4太赫兹量子级联激光器（quantum-cascade laser, QCL）自混合干涉术（self-mixing interferometry）的气体光谱学技术。此前所有QCL光谱学技术均需借助额外的太赫兹仪器（探测器、混频器或光谱仪）完成系统预校准或原位光谱分析。与之相比，本系统通过分析QCL两端的电压扰动，将激光器频率自校准至630兆赫兹（0.02%）的精度；该电压扰动源自安装于0-800毫米往返延迟线上的反射镜所产生的光反馈。本研究通过在反馈光路中引入气室完成了甲醇的光谱检测，并证实可分辨极限吸光系数约为0.0001 cm⁻¹。本数据集包含用于生成该学术论文中所有图表的原始实验数据。