论文标题
与两个脉冲内差异频率梳子的冷凝相的宽带红外光谱
Broadband infrared spectroscopy of condensed phases with two intra-pulse difference-frequency-generation frequency combs
论文作者
论文摘要
中红外（IR）光谱学提供了一种研究凝结相复杂分子的结构和动力学的方法。因此，发展紧凑和宽带中IR光谱仪一直是一个长期的挑战。在这里，我们表明，可以通过使用来自几个循环Ti：Sapphire振荡器的脉冲列车使用脉冲频率的脉冲频率来生成高度连贯和宽带的MID-IR频率梳子。通过将振荡器的输出光束紧密聚焦到单次扇出型型尼橡胶晶体晶体的单个型粉丝型型，并倾斜晶体相对于入射光束的方向，它表明，中IIR频率梳子具有超过1550 cm-1（46 thz）到3650 cm-1（3650 cm-1（110 thender）的八度频谱带宽超过1550 cm-1（46 thz），并生成了范围（110 thester-cartered carters），并生成了范围。然后，使用两个连贯的MID-IR频率梳子，我们证明了溶液中芳香族化合物和氨基酸的Ultroad Mid-IR双频梳光谱在实验上是可行的。因此，我们预计我们的MID-IR频率梳子可用于进一步发展凝结相中的化学反应性和生物分子的超快和宽带红外光谱。
Mid-infrared (mid-IR) spectroscopy provides a way to study structures and dynamics of complicated molecules in condensed phases. Therefore, developing compact and broadband mid-IR spectrometer has been a long-standing challenge. Here, we show that a highly coherent and broadband mid-IR frequency comb can be generated by using an intra-pulse difference-frequency-generation with a train of pulses from a few-cycle Ti:Sapphire oscillator. By tightly focusing the oscillator output beam into a single-pass fan-out-type periodically-poled lithium niobate crystal and tilting the orientation of the crystal with respect to incident beam, it is shown that mid-IR frequency comb with more than an octave spectral bandwidth from 1550 cm-1 (46 THz) to 3650 cm-1 (110 THz) and vanishing carrier-envelop offset phase can be generated. Then, using two coherent mid-IR frequency combs, we demonstrate that ultrabroad mid-IR dual frequency comb spectroscopy of both aromatic compounds and amino acids in solutions is experimentally feasible. We thus anticipate that our mid-IR frequency combs could be used to further develop ultrafast and broadband IR spectroscopy of chemically reactive and biological molecules in condensed phases.
