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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...

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Related Experiment Video

Updated: Jun 20, 2026

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

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Stimulated anti-Stokes Raman scattering in microdroplets.

D H Leach, R K Chang, W P Acker

    Optics Letters
    |September 29, 2009
    PubMed
    Summary

    Stimulated anti-Stokes Raman scattering (SARS) was observed in droplets. SARS signals were significantly weaker than stimulated Raman scattering (SRS) signals, with occasional spectral decoupling in water.

    Area of Science:

    • Physical Chemistry
    • Spectroscopy
    • Optics

    Background:

    • Stimulated Raman scattering (SRS) is a well-established spectroscopic technique.
    • Stimulated anti-Stokes Raman scattering (SARS) is a related phenomenon that can provide complementary information.
    • Investigating these scattering phenomena in microdroplets is crucial for understanding light-matter interactions in confined systems.

    Purpose of the Study:

    • To experimentally observe and characterize stimulated anti-Stokes Raman scattering (SARS) in liquid microdroplets.
    • To compare the intensity of SARS with that of stimulated Raman scattering (SRS).
    • To investigate the spectral correlation between SARS and SRS signals in water droplets.

    Main Methods:

    • Generation of stimulated anti-Stokes Raman scattering (SARS) using a single input beam.

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  • Experimental observation of SARS in carbon tetrachloride (CCl4), ethanol, and water droplets.
  • Simultaneous detection of SARS and SRS spectra for water droplets.

    • Main Results:

    • Successful observation of SARS in CCl4, ethanol, and water droplets.
    • First-order SARS intensity was found to be approximately 10^4 times lower than first-order SRS intensity in ethanol droplets.
    • Simultaneous detection revealed an occasional lack of correlation between SARS and SRS spectra for water droplets.

    Conclusions:

    • SARS is a feasible spectroscopic technique observable in liquid microdroplets.
    • SARS signals are considerably weaker than SRS signals, posing challenges for detection.
    • The observed spectral decoupling in water suggests complex underlying physical processes influencing SARS and SRS generation.