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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.
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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Related Experiment Video

Updated: Mar 14, 2026

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
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High sensitivity and resolution integrated optical system for portable Raman spectrometer.

Ming Tang, Xin Wang, Fan Xianguang

    Applied Optics
    |September 24, 2016
    PubMed
    Summary

    This study presents an integrated optical system for Raman spectroscopy, achieving significantly higher sensitivity and resolution. The novel design enables a portable, cost-effective Raman spectrometer with improved performance.

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    Area of Science:

    • Optics
    • Spectroscopy
    • Instrumentation

    Background:

    • Developing portable and high-performance Raman spectrometers is crucial for various analytical applications.
    • Existing systems often face limitations in sensitivity, resolution, or cost-effectiveness.

    Purpose of the Study:

    • To design and present an integrated optical system for enhanced Raman spectroscopy.
    • To improve sensitivity, resolution, and portability while reducing costs.

    Main Methods:

    • Directly coupling a probe to a monochromator.
    • Utilizing aspheric and achromatic lenses in the coupling path.
    • Employing a high-transmission dichroic filter as a beam splitter and optimizing monochromator throughput.

    Main Results:

    • Achieved a signal-to-noise ratio approximately 4 times higher than independent probe and monochromator setups.
    • Demonstrated high resolution of 4 cm⁻¹ (0.28 nm).
    • The system is characterized by low cost and portable size.

    Conclusions:

    • The integrated optical system offers significant improvements in sensitivity and resolution for Raman spectroscopy.
    • This development provides a foundation for creating advanced, integrated, portable Raman spectrometers.
    • The system's cost-effectiveness and portability make it suitable for wider applications.