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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...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

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Related Experiment Video

Updated: Jun 19, 2026

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

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

Published on: April 4, 2016

Continuous-wave stimulated Raman scattering in microdroplets.

H B Lin, J D Eversole, A J Campillo

    Optics Letters
    |October 2, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Continuous-wave stimulated Raman scattering was observed in benzene and toluene microdroplets. Enhanced Raman gains were achieved using droplet resonance and cavity quantum electrodynamics (QED) effects, significantly lowering thresholds.

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    Last Updated: Jun 19, 2026

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    Published on: April 28, 2022

    Area of Science:

    • Optics and Photonics
    • Chemical Physics
    • Quantum Optics

    Background:

    • Stimulated Raman scattering (SRS) is a nonlinear optical process.
    • Microdroplets can act as optical cavities, enhancing light-matter interactions.
    • Cavity quantum electrodynamics (QED) effects can significantly modify light-matter interactions.

    Purpose of the Study:

    • To investigate continuous-wave stimulated Raman scattering in microdroplets.
    • To explore the role of droplet resonance and cavity QED enhancement in lowering SRS thresholds.
    • To analyze the relationship between cavity gain enhancement and spectral properties.

    Main Methods:

    • Experimental observation of SRS in benzene and toluene microdroplets (11-13 micrometers).
    • Utilizing simultaneous pump and Stokes wave resonance within the microdroplets.
    • Applying cavity QED principles to quantify Raman gain enhancement.

    Main Results:

    • SRS observed at low pump intensities (8 kW/cm^2 for benzene, 24 kW/cm^2 for toluene).
    • Cavity QED enhancement factor of approximately 50 times compared to bulk liquids.
    • Experimental behavior consistent with a photon-state conservation argument for cavity gain.

    Conclusions:

    • Microdroplets provide an effective platform for low-threshold SRS.
    • Simultaneous resonance and cavity QED are crucial for significant Raman gain enhancement.
    • The proposed relation for cavity gain enhancement is validated by experimental results.