Sub-second hyper-spectral low-frequency vibrational imaging via impulsive Raman excitation

Dekel Raanan, Xavier Audier, Siddarth Shivkumar, Maor Asher, Matan Menahem, Omer Yaffe, Nicolas Forget, Hervé Rigneault, Dan Oron

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Abstract

Real-time vibrational microscopy has been recently demonstrated by various techniques, most of them utilizing the well-known schemes of coherent anti-stokes Raman scattering and stimulated Raman scattering. These techniques readily provide valuable chemical information mostly in the higher vibrational frequency regime (>400 cm−1). Addressing the low vibrational frequency regime (<200 cm−1) is challenging due to the usage of spectral filters that are required to isolate the signal from the Rayleigh scattered excitation field. In this Letter, we report on rapid, high-resolution, low-frequency (<130 cm−1) vibrational microscopy using impulsive coherent Raman excitation. By combining impulsive excitation with a fast acousto-optic delay line, we detect the Raman-induced optical Kerr lensing and spectral shift effects with a 25 μs pixel dwell time to produce shot-noise limited, low-frequency hyper-spectral images of various samples.

Original languageEnglish
Pages (from-to)5153-5156
Number of pages4
JournalOptics Letters
Volume44
Issue number21
DOIs
Publication statusPublished - Nov 1 2019

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Raanan, D., Audier, X., Shivkumar, S., Asher, M., Menahem, M., Yaffe, O., Forget, N., Rigneault, H., & Oron, D. (2019). Sub-second hyper-spectral low-frequency vibrational imaging via impulsive Raman excitation. Optics Letters, 44(21), 5153-5156. https://doi.org/10.1364/OL.44.005153