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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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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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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Updated: Jun 11, 2025

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb
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Towards a sensing model using a random laser combined with diffuse reflectance spectroscopy.

Dongqin Ni1,2, Florian Klämpfl1,2, Michael Schmidt1,2

  • 1Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Straße 3/5, 91052 Erlangen, Germany.

Biomedical Optics Express
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Summary
This summary is machine-generated.

This study introduces a quantitative model for optical sensing in turbid media using random lasers. The peak wavelength shift effectively measures scattering and absorption properties, enabling precise optical property sensing.

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Area of Science:

  • Optics and Photonics
  • Biomedical Optics
  • Materials Science

Background:

  • Random laser emission is influenced by both scattering and absorption properties.
  • Random lasers show potential for optical property sensing, but quantitative measurements are limited.
  • Existing methods for sensing optical properties in turbid media often lack precision.

Purpose of the Study:

  • To develop a generalized mathematical quantitative model for optical sensing in turbid media.
  • To integrate random laser technology with diffuse reflectance spectroscopy for enhanced sensing capabilities.
  • To establish a reliable method for quantitative measurement of optical properties.

Main Methods:

  • A novel quantitative model was developed, separating the gain effect of the active medium and optical properties of the passive medium.
  • Rhodamine 6G was used as the active medium.
  • Intralipid (scattering) and ink (absorption) were used to validate the model's performance in diverse turbid media.

Main Results:

  • The peak wavelength shift of the random laser was identified as an effective sensing parameter.
  • The model successfully demonstrated quantitative sensing of scattering and absorption properties.
  • Interrelated scaling parameters within the model were simplified to a single parameter.

Conclusions:

  • The proposed combined model offers a promising approach for direct quantitative sensing of optical properties in various turbid media.
  • This method advances the application of random lasers in optical sensing.
  • The findings pave the way for more accurate optical diagnostics and material characterization.