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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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: Overview01:20

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 the...

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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Published on: May 18, 2011

Multiple-pass Raman gain cell.

W R Trutna, R L Byer

    Applied Optics
    |March 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A multiple-pass Herriott cell enhances Raman gain, reducing the threshold pump power for stimulated Raman scattering (SRS). This technique is particularly effective in the infrared (IR) region for applications like SRS in hydrogen gas.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Spectroscopy

    Background:

    • Stimulated Raman scattering (SRS) is a nonlinear optical process.
    • Achieving efficient SRS, especially in the infrared (IR), requires significant pump power.
    • Traditional methods often struggle with low Raman gain in the IR spectrum.

    Purpose of the Study:

    • To evaluate and demonstrate the application of a multiple-pass Herriott cell for SRS.
    • To enhance Raman gain and reduce SRS threshold pump power.
    • To provide an analysis and design procedure for such a cell.

    Main Methods:

    • Utilizing a multiple-pass Herriott cell configuration.
    • Implementing periodic refocusing within the cell.
    • Conducting experimental analysis of SRS in H(2) gas.

    Main Results:

    • The multiple-pass Herriott cell successfully enhances Raman gain.
    • A significant reduction in SRS threshold pump power was achieved.
    • Experimental data for SRS in H(2) gas validated the cell's performance.

    Conclusions:

    • Multiple-pass Herriott cells are effective for boosting Raman gain.
    • This method offers a viable solution for low-gain SRS in the IR.
    • The developed analysis and design procedure can guide future cell construction.