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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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Related Experiment Video

Updated: Mar 21, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Ultrafast second-Stokes diamond Raman laser.

Michelle Murtagh, Jipeng Lin, Johanna Trägårdh

    Optics Express
    |May 4, 2016
    PubMed
    Summary

    We developed a tunable femtosecond diamond Raman laser. This laser extends wavelength coverage for standard laser sources, demonstrating potential for cascaded Raman conversion.

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Femtosecond lasers are crucial for precise measurements and material processing.
    • Diamond Raman lasers offer unique nonlinear optical properties.
    • Extending the wavelength tunability of ultrafast lasers is an ongoing challenge.

    Purpose of the Study:

    • To demonstrate a synchronously-pumped femtosecond diamond Raman laser.
    • To achieve tunable second-Stokes output.
    • To explore the potential of cascaded Raman conversion for wavelength extension.

    Main Methods:

    • Utilized a mode-locked Ti:sapphire laser for synchronous pumping (840-910 nm, 165 fs duration).
    • Employed a diamond Raman laser cavity.
    • Investigated cascaded Raman scattering to generate second-Stokes output.

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    Last Updated: Mar 21, 2026

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    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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    Main Results:

    • Achieved a tunable second-Stokes output from the diamond Raman laser.
    • Wavelength tunability ranged from 1082 nm to 1200 nm.
    • The generated pulses had sub-picosecond duration.

    Conclusions:

    • Successfully demonstrated a synchronously-pumped femtosecond diamond Raman laser with tunable second-Stokes output.
    • The results highlight the potential of cascaded Raman conversion in diamond.
    • This technology can extend the wavelength coverage of existing laser sources into new spectral regions.