Mitigating cross‐phase modulation artifacts in femtosecond stimulated Raman scattering,Journal of Raman Spectroscopy

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Mitigating cross‐phase modulation artifacts in femtosecond stimulated Raman scattering
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-08-02 , DOI: 10.1002/jrs.5958
Thomas Würthwein ₁ , Niklas M. Lüpken ₁ , Niels Irwin ₁ , Carsten Fallnich _{1,

2,

3}

Affiliation

In contrast to spontaneous Raman scattering, coherent Raman scattering techniques, such as femtosecond stimulated Raman scattering (FSRS), show advantages for many applications. Besides an enhanced signal strength, FSRS is free of a nonresonant background but is affected by cross‐phase modulation (XPM). The resulting artifacts in FSRS become relevant for high pulse intensities (GW/cm²‐regime) and ultrashort pulses (<2 ps), both necessary for super‐resolution experiments. As the pulse duration is a crucial parameter for XPM as well as for FSRS, we present a setup in which we adjust the pulse duration across the relevant range (0.5–3 ps), in order to investigate the XPM influence on the spectra. Furthermore, we vary the peak intensity, the temporal overlap between the interacting pulses, and the nonlinear refractive index coefficient n₂ of the sample, showing that a trade‐off between all these quantities enables the measurement of unaffected FSRS spectra

中文翻译：

飞秒激发的拉曼散射中的交叉相位调制伪影得到缓解

与自发拉曼散射相反，相干拉曼散射技术（例如飞秒激发拉曼散射（FSRS））在许多应用中显示出优势。除了增强的信号强度外，FSRS不受非共振背景的影响，但受交叉相位调制（XPM）的影响。FSRS中产生的伪影与高脉冲强度（GW / cm ²区域）和超短脉冲（<2 ps），这都是超分辨率实验所必需的。由于脉冲持续时间对于XPM和FSRS都是至关重要的参数，因此我们提出一种设置，在该设置中，我们在相关范围（0.5–3 ps）内调整脉冲持续时间，以研究XPM对光谱的影响。此外，我们改变了峰强度，相互作用脉冲之间的时间重叠以及样品的非线性折射率系数n ₂，这表明在所有这些量之间进行折衷可以测量未受影响的FSRS光谱

更新日期：2020-08-02

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