Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan.
Aeronautical Technology Directorate, Japan Aerospace Exploration Agency, Tokyo, 181-0015, Japan.
Nat Commun. 2018 Oct 25;9(1):4448. doi: 10.1038/s41467-018-06956-x.
Fourier-transform spectroscopy (FTS) has been widely used as a standard analytical technique over the past half-century. FTS is an autocorrelation-based technique that is compatible with both temporally coherent and incoherent light sources, and functions as an active or passive spectrometer. However, it has been mostly used for static measurements due to the low scan rate imposed by technological restrictions. This has impeded its application to continuous rapid measurements, which would be of significant interest for a variety of fields, especially when monitoring of non-repeating or transient complex dynamics is desirable. Here, we demonstrate highly efficient FTS operating at a high spectral acquisition rate with a simple delay line based on a dynamic phase-control technique. The independent adjustability of phase and group delays allows us to achieve the Nyquist-limited spectral acquisition rate over 10,000 spectra per second, while maintaining a large spectral bandwidth and high resolution. We also demonstrate passive spectroscopy with an incoherent light source.
傅里叶变换光谱学（FTS）在过去的半个世纪中被广泛用作标准分析技术。FTS 是一种基于自相关的技术，与时间相干和非相干光源兼容，并且可以作为主动或被动光谱仪。但是，由于技术限制导致的扫描速率低，它主要用于静态测量。这阻碍了它在连续快速测量中的应用，这在许多领域都具有重要意义，特别是在需要监测非重复或瞬态复杂动态时。在这里，我们展示了一种基于动态相控技术的简单延迟线的高效率 FTS，其光谱采集速率非常高。相位和群延迟的独立可调性使我们能够实现每秒超过 10000 次光谱的奈奎斯特限制光谱采集速率，同时保持大的光谱带宽和高分辨率。我们还展示了具有非相干光源的被动光谱学。
