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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

545
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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Raman Spectroscopy: Overview01:20

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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...
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Related Experiment Video

Updated: Sep 20, 2025

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
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Hyperspectral acquisition with ScanImage at the single pixel level: application to time domain coherent Raman

Samuel Metais, Sisira Suresh, Paulo Diniz

    Optics Express
    |November 22, 2024
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    Summary

    This study introduces a new hyperspectral microscopy method for capturing fast signals at each pixel. The technique enables ultra-fast hyperspectral vibrational imaging, crucial for dynamic biological processes.

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    Area of Science:

    • Microscopy
    • Spectroscopy
    • Biophysics

    Background:

    • Fast time-dependent signals at the pixel level pose challenges for traditional hyperspectral imaging.
    • Acquiring time-resolved data in microscopy requires specialized acquisition schemes.

    Purpose of the Study:

    • To develop and implement a hyperspectral point scanning microscopy strategy for signals varying rapidly at each pixel.
    • To adapt the ScanImage software for high-speed, time-resolved hyperspectral data acquisition.

    Main Methods:

    • A novel acquisition scheme slowing the X-axis scan while maintaining high data acquisition rates.
    • Utilizing ScanImage software to create 2D images where the X-axis encodes both spatial and temporal information.
    • Implementing the scheme for time-domain coherent Raman imaging with an acousto-optic delay line.

    Main Results:

    • Demonstrated ultra-fast hyperspectral vibrational imaging in the low frequency range [10cm⁻¹, 150 cm⁻¹].
    • Achieved imaging over a 500 μm field of view (64 x 64 pixels) in 130ms (∼7.5 frames/s).
    • The method effectively captures time-dependent signals at each pixel for hyperspectral analysis.

    Conclusions:

    • The proposed hyperspectral acquisition scheme enables rapid, time-resolved imaging.
    • This strategy is adaptable to various applications requiring the capture of fast-evolving signals at the pixel level.
    • Facilitates advanced studies in biophysics and materials science requiring high temporal and spectral resolution.