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Related Concept Videos

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...
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 8, 2026

Real-Time, Two-Color Stimulated Raman Scattering Imaging of Mouse Brain for Tissue Diagnosis
10:57

Real-Time, Two-Color Stimulated Raman Scattering Imaging of Mouse Brain for Tissue Diagnosis

Published on: February 1, 2022

Time-gated imaging through dense scatterers with a Raman amplifier.

R Mahon, M D Duncan, L L Tankersley

    Applied Optics
    |September 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel time-gated Raman amplifier successfully detected hidden images through dense scattering materials. This technique overcomes limitations of conventional imaging methods for challenging environments.

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    Related Experiment Videos

    Last Updated: Jun 8, 2026

    Real-Time, Two-Color Stimulated Raman Scattering Imaging of Mouse Brain for Tissue Diagnosis
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    Published on: February 1, 2022

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Materials Science

    Background:

    • Strongly scattering materials obscure optical imaging.
    • Conventional imaging techniques fail in highly turbid media.
    • Advanced amplification and gating are needed for subsurface imaging.

    Purpose of the Study:

    • To demonstrate a time-gated Raman amplifier for imaging through scattering media.
    • To evaluate the system's performance with sub-125 µm structures.
    • To compare the system against streak cameras and low-noise cameras.

    Main Methods:

    • Utilized a frequency-doubled Nd:YAG pump laser with 30 ps pulses for time gating.
    • Employed a Raman amplifier to enhance weak image signals.
    • Tested imaging through polystyrene spheres and nondairy creamer suspensions.

    Main Results:

    • Successfully detected images with structures smaller than 125 µm.
    • Achieved imaging through media with light extinction factors up to e(33).
    • Outperformed streak cameras and sensitive cameras in dense scattering conditions.

    Conclusions:

    • Time-gated Raman amplification is effective for imaging through highly scattering materials.
    • This method offers a significant advancement over existing imaging technologies for turbid media.
    • Potential applications in fields requiring subsurface or obscured object visualization.