论文标题
照片声音双频梳光谱
Photo-acoustic dual-frequency comb spectroscopy
论文作者
论文摘要
照片声学光谱（PAS）是气体，流体和固体最敏感的非破坏性分析技术之一。它可以在任何波长下无背景，并且适用于微观甚至非透明样品。将PAS扩展到宽带波长覆盖范围是一种强大的工具，尽管在不牺牲波长分辨率和获取速度的情况下实施具有挑战性。在这里，我们表明双频梳光谱（DC）的无与伦比的精度，速度和波长覆盖范围可以与光声检测的优势结合使用。声波干涉图是通过双弯曲吸收在样品中产生的，并由麦克风检测。例如，精确，快速采样了气体吸收特征。长期相干平均进一步提高了灵敏度。光声双频梳光谱的这种新型方法为在所有光波长中快速和敏感的多种物种分子分析产生了前所未有的机会。
Photo-acoustic spectroscopy (PAS) is one of the most sensitive non-destructive analysis techniques for gases, fluids and solids. It can operate background-free at any wavelength and is applicable to microscopic and even non-transparent samples. Extension of PAS to broadband wavelength coverage is a powerful tool, though challenging to implement without sacrifice of wavelength resolution and acquisition speed. Here, we show that the unmatched precision, speed and wavelength coverage of dual-frequency comb spectroscopy (DCS) can be combined with the advantages of photo-acoustic detection. Acoustic wave interferograms are generated in the sample by dual-comb absorption and detected by a microphone. As an example, weak gas absorption features are precisely and rapidly sampled; long-term coherent averaging further increases the sensitivity. This novel approach of photo-acoustic dual-frequency comb spectroscopy generates unprecedented opportunities for rapid and sensitive multi-species molecular analysis across all wavelengths of light.
