共振介导（2+1）三光子吸收相干相位控制的脉宽依赖性
Pulse-Bandwidth Dependence of Coherent Phase Control of Resonance-Mediated (2+1) Three-Photon Absorption
摘要：
我们详细研究了飞秒共振介导的（2+1）三光子吸收的相干相位控制及其对激发脉冲光谱带宽的依赖性。该区域是第三微扰阶的弱场区域。相应的干涉机制包括一组与中间态共振的三光子激发路径和一组与中间态近共振的三光子激发路径，研究的模型系统是钠原子（Na），得到了实验和数值-理论结果。其中突出的结果是我们发现，与简单的适当的脉冲整形的激发带宽的增加导致相应的增加，在增强的三光子吸收引起的吸收（未成形）变换限制脉冲。例如，这里，40 nm带宽导致超过变换限制吸收的数量级增强。
英文摘要：
We study in detail coherent phase control of femtosecond resonance-mediated (2+1) three-photon absorption and its dependence on the spectral bandwidth of the excitation pulse. The regime is the weak-field regime of third perturbative order. The corresponding interference mechanism involves a group of three-photon excitation pathways that are on resonance with the intermediate state and a group of three-photon excitation pathways that are near resonant with it. The model system of the study is atomic sodium (Na), for which experimental and numerical-theoretical results are obtained. Prominent among the results is our finding that with simple proper pulse shaping an increase in the excitation bandwidth leads to a corresponding increase in the enhancement of the three-photon absorption over the absorption induced by the (unshaped) transform-limited pulse. For example, here, a 40-nm bandwidth leads to an order-of-magnitude enhancement over the transform-limited absorption.
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