Vibrational spectroscopy via stimulated Raman induced Kerr lensing

Dekel Raanan, Julian Lüttig, Yaron Silberberg, Dan Oron

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3 Citations (Scopus)

Abstract

We present a new method for the measurement of the stimulated Raman spectrum based on time-dependent spatial modulation of a laser beam as it passes through a Raman active medium. This effect is similar to the instantaneous Kerr lensing and Kerr deflection yet involves resonant vibrations which result in a time-dependent refractive index change. We use sub-nanojoule pulses together with a sensitive pump-probe measurement apparatus to excite and detect the fine (10-5-10-4) temporal and spatial variations in intensity resulting from the Raman-induced Kerr effect. We demonstrate the effect by changing the spatial overlap between the pump and probe at the sample and measuring the time-dependent deformation of the probe beam's cross section. This method is particularly useful for detection of low-frequency Raman lines, as we demonstrate by measuring the Raman spectrum of neat liquids in a cuvette.

Original languageEnglish
Article number092501
JournalAPL Photonics
Volume3
Issue number9
DOIs
Publication statusPublished - Jan 1 2018

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ASJC Scopus subject areas

  • Computer Networks and Communications
  • Atomic and Molecular Physics, and Optics

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