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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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Updated: Jun 20, 2026

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
09:57

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

Published on: July 25, 2022

Continuous-wave stimulated Raman scattering.

C H Bryant, M Golombok

    Optics Letters
    |September 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study details the first observation of continuous-wave stimulated Raman scattering (SRS) in liquids. Enhanced backward SRS offers improved signal-to-noise ratios, simplifying detection and enabling higher-order scattering observations.

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    Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

    Published on: July 17, 2016

    Area of Science:

    • Nonlinear Optics
    • Spectroscopy
    • Laser Physics

    Background:

    • Stimulated Raman scattering (SRS) is a nonlinear optical phenomenon.
    • Previous SRS observations typically required specific collection optics and faced signal-to-noise limitations.
    • Continuous-wave (CW) excitation for SRS was not previously reported.

    Purpose of the Study:

    • To report the first observation of continuous-wave stimulated Raman scattering (CW-SRS).
    • To investigate the characteristics of forward and backward CW-SRS in liquid media.
    • To evaluate the signal detection ease and signal-to-noise ratio (SNR) of different scattering geometries.

    Main Methods:

    • Utilizing a continuous-wave laser source to excite SRS in various liquid samples.
    • Observing and analyzing both forward and backward scattered Raman signals.
    • Comparing the SNR of backscattered SRS with forward and side-scattered SRS.

    Main Results:

    • Successfully observed CW-SRS in liquids for the first time.
    • Enhanced backward SRS demonstrated a significantly improved SNR compared to forward or side scatter.
    • Phase-conjugate beam formation in backscattered SRS contributes to the enhanced SNR.
    • Higher-order Stokes scattering was also detected.
    • Identical gains for forward and backward signals were observed, contrary to theoretical predictions, attributed to saturation effects.

    Conclusions:

    • Continuous-wave stimulated Raman scattering is achievable in liquid media.
    • Enhanced backward SRS provides a more efficient and detectable signal.
    • Saturation effects play a crucial role in gain characteristics of high-gain liquids under CW-SRS conditions.