双频梳非线性透射光谱
Nonlinear transmission spectroscopy with dual frequency combs
摘要：
我们展示了如何两个频率梳$\mathcal{E}_1$，$\mathcal{E}_2$可用于测量单光子，双光子吸收（TPA），并在一个分子的拉曼共振与三个电子带，通过检测的非线性传输信号的射频调制。一些峰独立于梳的载波频率，而其他峰随该频率偏移并且具有接近梳宽度的宽度。通过测量传输信号$\sim\mathcal{E}_1^2 \mathcal{E}_2^2$来选择与载波频率无关的TPA和拉曼共振，并且通过测量传输信号$\sim\mathcal{E}_1^3\mathcal{E}_2$来选择单光子共振。正弦光谱相位整形强烈影响TPA，但不影响拉曼共振。
英文摘要：
We show how two frequency combs $\mathcal{E}_1$, $\mathcal{E}_2$ can be used to measure single-photon, two-photon absorption (TPA), and Raman resonances in a molecule with three electronic bands, by detecting the radio frequency modulation of the nonlinear transmission signal. Some peaks are independent of the carrier frequency of the comb and others shift with that frequency and have a width close to the comb width. TPA and Raman resonances independent of the carrier frequency are selected by measuring the transmission signal $\sim\mathcal{E}_1^2 \mathcal{E}_2^2$ and the single-photon resonances are selected by measuring the transmission signal $\sim\mathcal{E}_1^3\mathcal{E}_2$. Sinusoidal spectral phase shaping strongly affects the TPA, but not the Raman resonances.
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