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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

Raman Spectroscopy: Overview

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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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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Highly efficient tunable picosecond deep ultraviolet laser system for Raman spectroscopy.

Anton D Shutov, Georgi V Petrov, Da-Wei Wang

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    |November 28, 2019
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    Summary

    We developed a tunable deep ultraviolet (DUV) laser for Raman spectroscopy. This system enables high-resolution analysis of molecular vibrations, advancing spectroscopic capabilities.

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    Area of Science:

    • Spectroscopy
    • Laser Physics
    • Materials Science

    Background:

    • Deep ultraviolet (DUV) Raman spectroscopy offers unique advantages for molecular analysis.
    • Developing compact and efficient DUV laser sources is crucial for advancing spectroscopic techniques.

    Purpose of the Study:

    • To present a novel narrowband laser system tunable in the DUV range (219-236 nm).
    • To demonstrate its application in high-resolution DUV Raman spectroscopy.

    Main Methods:

    • A two-stage optical parametric amplifier (OPA) was employed, seeded by a narrowband continuous wave diode laser.
    • Frequency conversion to DUV was achieved using Lithium Triborate (LBO) and Beta Barium Borate (BBO) crystals.
    • The system generated 6.7 ps pulses at 100 kHz with energies up to 0.36 µJ.

    Main Results:

    • The OPA achieved over 300 mW of signal power with a total pump power of 2.7 W.
    • A 12% conversion efficiency was reached for the OPA signal to DUV radiation using type-I phase matching in BBO.
    • A high dynamic range, high spectral resolution spontaneous Raman spectrum of air was successfully collected.

    Conclusions:

    • The developed DUV laser system is highly suitable for advanced Raman spectroscopy.
    • This technology enables sensitive and detailed molecular vibrational analysis.