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Raman Spectroscopy Instrumentation: Overview

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: Overview

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...

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Related Experiment Video

Updated: May 5, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

High-speed hyperspectral Raman imaging for label-free compositional microanalysis.

Ji Qi¹, Jingting Li, Wei-Chuan Shih

¹Department of Electrical and Computer Engineering, University of Houston, 4800 Calhoun Rd., Houston TX 77204, USA.

Biomedical Optics Express

|December 4, 2013

Summary

This summary is machine-generated.

High-speed hyperspectral Raman imaging enables label-free compositional microanalysis at ~1,000 spots/sec. This technique offers superior signal-to-noise ratio for diverse samples, outperforming traditional methods.

Keywords:

(170.0110) Imaging systems (170.1530) Cell analysis (180.5655) Raman microscopy

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Area of Science:

Spectroscopy
Materials Science
Microscopy

Background:

Label-free compositional microanalysis is crucial for material and biological sciences.
Traditional Raman imaging methods often face limitations in speed and signal quality.

Purpose of the Study:

To develop and demonstrate a high-speed hyperspectral Raman imaging system for label-free compositional microanalysis.
To evaluate the system's performance across various sample types and compare it with existing technologies.

Main Methods:

Integrated active-illumination for high-speed hyperspectral Raman data acquisition.
Acquisition of ~1,000 Raman spectra per second without mechanical scanning.
Testing on silicon substrates, polymer microparticles, and bacterial spores.

Main Results:

Demonstrated rapid data acquisition from uniform and non-uniform samples with varying Raman scattering strengths.
Achieved significant imaging speed advantage over point-scan methods with electron-multiplied CCD cameras.
Enabled longer integration times per spot, resulting in superior signal-to-noise ratio.

Conclusions:

The developed system provides a transformative approach for rapid, high-quality Raman spectral collection.
Enables robust compositional microanalysis with potential applications in semiconductor, polymer, and biomedical fields.