压缩传感加速超快光谱技术
Accelerating ultrafast spectroscopy with compressive sensing
摘要：
超快光谱是研究原子、分子和纳米结构中光致动力学过程的重要工具。通常，进行这些实验的时间范围从几分钟到几小时，取决于光谱方法的选择。这是可取的，以减少这一时间开销，不仅缩短时间和实验室资源，但也有可能检查脆弱的标本，在长期的实验过程中迅速降解。在这篇文章中，我们鼓励使用压缩感知，通过减少超快光谱中的测量总数来显着缩短数据采集时间。我们将这种技术应用于超快瞬态吸收光谱和超快太赫兹光谱的实验数据，并表明良好的估计可以得到低至15%的总测量，这意味着减少6倍的数据采集时间。
英文摘要：
Ultrafast spectroscopy is an important tool for studying photoinduced dynamical processes in atoms, molecules, and nanostructures. Typically, the time to perform these experiments ranges from several minutes to hours depending on the choice of spectroscopic method. It is desirable to reduce this time overhead to not only to shorten time and laboratory resources, but also to make it possible to examine fragile specimens which quickly degrade during long experiments. In this article, we motivate using compressive sensing to significantly shorten data acquisition time by reducing the total number of measurements in ultrafast spectroscopy. We apply this technique to experimental data from ultrafast transient absorption spectroscopy and ultrafast terahertz spectroscopy and show that good estimates can be obtained with as low as 15% of the total measurements, implying a 6-fold reduction in data acquisition time.
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