Mitigating cross-phase modulation artifacts in femtosecond stimulated Raman scattering

Thomas Würthwein*, Niklas M. Lüpken, Niels Irwin, Carsten Fallnich

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

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.

Original languageEnglish
Pages (from-to)2265-2271
Number of pages7
JournalJournal of raman spectroscopy
Volume51
Issue number11
DOIs
Publication statusPublished - Nov 2020

Keywords

  • artifacts
  • cross-phase modulation
  • femtosecond stimulated raman scattering
  • spectral distortion

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