论文标题
频率稳定和中红外量子cascade激光器的频率稳定和SI追踪，以进行精确的分子光谱法
Frequency stabilisation and SI tracing of mid-infrared quantum-cascade lasers for precision molecular spectroscopy
论文作者
论文摘要
对分子进行精确审查的技术的发展为精确光谱和量子技术领域的新研究提供了令人兴奋的可能性。这些结构域中的实验通常解决了中红外（miR）光谱区域中的分子振动，从而产生了对光谱纯和精确的mir激光源的需求。量子cascade激光器（QCL）已成为在广泛的miR频率上可用的相干辐射来源。在这里，我们展示了一种强大的方法，用于同时线宽变窄，频率稳定和miR QCLS的绝对频率参考，所有这些都是精确光谱实验的先决条件。在将其辐射到可见域的辐射上方之后，我们将QCL的相位锁定到线宽 - 核心频率梳子上，该光频率梳子通过光纤链接提及了远程Si-si-table si-table tractable trake频率标准，以实现绝对频率校准。为了实现QCL和OFC之间的节拍音符的可靠频率计数，我们采用了冗余跟踪振荡器，并在1 s和$ 2 \ times10^{ - 13} $的频率不稳定性在1 s和$ 2 \ times10^{ - 14} $时，在1000 s集成时间，限制了我们的远程参考的准确性。
The advancement of technologies for the precise interrogation of molecules offers exciting possibilities for new studies in the realms of precision spectroscopy and quantum technologies. Experiments in these domains often address molecular vibrations in the mid-infrared (MIR) spectral region, thus generating the need for spectrally pure and accurate MIR laser sources. Quantum-cascade lasers (QCLs) have emerged as flexible sources of coherent radiation available over a wide range of MIR frequencies. Here, we demonstrate a robust approach for the simultaneous linewidth narrowing, frequency stabilisation, and absolute frequency referencing of MIR QCLs all of which are prerequisites for precise spectroscopic experiments. Following upconversion of its radiation to the visible domain, we implement a phase lock of the QCL to a linewidth-narrowed optical frequency comb which is referenced to a remote SI-traceable primary frequency standard via a fibre link for absolute frequency calibration. To achieve a reliable frequency counting of the beat note between the QCL and the OFC, we employ redundant tracking oscillators and demonstrate a frequency instability of $5\times10^{-13}$ at 1 s and $2\times10^{-14}$ at 1000 s integration time, limited by the accuracy of our remote reference.
