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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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.
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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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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Related Experiment Video

Updated: Oct 14, 2025

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
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Multi-window sparse spectral sampling stimulated Raman scattering microscopy.

Isaac J Pence1, Benjamin A Kuzma1, Maximilian Brinkmann2

  • 1Wellman Center for Photomedicine, Massachusetts General Hospital, Charlestown, MA 02129, USA.

Biomedical Optics Express
|November 8, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new Stimulated Raman Scattering (SRS) imaging method using sparse spectral sampling. This technique rapidly analyzes chemical information in biological samples, enabling precise monitoring of drug delivery in skin.

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Area of Science:

  • Biomedical Optics
  • Chemical Imaging
  • Spectroscopy

Background:

  • Stimulated Raman Scattering (SRS) offers label-free, chemical-specific imaging of biological and clinical samples.
  • Traditional SRS methods use broadband or narrowband tunable light sources, limiting spectral range or speed.
  • Hyperspectral SRS imaging requires efficient methods for acquiring spectral data across broad Raman windows.

Purpose of the Study:

  • To develop and demonstrate a novel multi-window sparse spectral sampling SRS (S⁴RS) approach.
  • To enable rapid, hands-free, and automated spectral acquisition across diverse Raman windows (fingerprint, silent, high wavenumber).
  • To apply S⁴RS for monitoring dynamic changes of active pharmaceutical ingredients in skin for topical drug delivery applications.

Main Methods:

  • Utilized a rapidly-tunable dual-output all-fiber optical parametric oscillator for SRS excitation.
  • Implemented multi-window sparse spectral sampling to target specific vibrational modes across >1400 cm⁻¹.
  • Applied computational techniques for spectral decomposition and feature selection to identify discriminating Raman frequencies.

Main Results:

  • Demonstrated S⁴RS capability for both full spectrum scanning and rapid tuning to select frequencies.
  • Successfully identified a sparse subset of Raman frequencies for effective sample discrimination.
  • Applied the method to monitor spatiotemporal dynamics of active pharmaceutical ingredients within skin tissue.

Conclusions:

  • The S⁴RS approach provides a versatile and efficient platform for label-free chemical imaging.
  • This method significantly enhances the speed and flexibility of SRS hyperspectral data acquisition.
  • S⁴RS is highly relevant for studying topical drug delivery and other dynamic biological processes.