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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...

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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Optimization of a Raman shifted dye laser system for DIAL applications.

U N Singh, Z Chu, R Mahon

    Applied Optics
    |June 22, 2010
    PubMed
    Summary

    This study presents an efficient Raman shifted dye laser system producing tunable radiation at 765 and 940 nm. The system demonstrates high spectral purity, indicating its suitability for differential absorption lidar (DIAL) measurements.

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    Last Updated: Jun 12, 2026

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    Published on: October 17, 2010

    Area of Science:

    • Laser physics
    • Spectroscopy
    • Atmospheric remote sensing

    Background:

    • Development of tunable laser sources is crucial for remote sensing applications.
    • Differential Absorption Lidar (DIAL) requires spectrally pure laser radiation for accurate atmospheric measurements.

    Purpose of the Study:

    • To describe an efficient Raman shifted dye laser system.
    • To evaluate its suitability for differential absorption lidar (DIAL) measurements.

    Main Methods:

    • Utilized a Raman shifted dye laser system.
    • Operated a Raman cell with hydrogen gas at pressures below 14 atm.
    • Performed optical depth measurements on oxygen A band absorption lines.

    Main Results:

    • Achieved tunable radiation generation at 765 nm and 940 nm with a 0.03 cm(-1) bandwidth.
    • Recorded optimal first Stokes energy conversions of 45% (765 nm) and 37% (940 nm).
    • Optical depth measurements confirmed high spectral purity of the laser and Raman shifted radiation.

    Conclusions:

    • The developed Raman shifted dye laser system is efficient and produces spectrally pure radiation.
    • The system's characteristics make it feasible for differential absorption lidar (DIAL) measurements.
    • This technology advances capabilities in atmospheric monitoring and analysis.