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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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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Efficient, all-solid-state, Raman laser in the yellow, orange and red.

R Mildren, M Convery, H Pask

    Optics Express
    |May 29, 2009
    PubMed
    Summary

    This study demonstrates a potassium gadolinium tungstate (KGd(WO(4))(2)) Raman laser generating over 8 yellow-to-red wavelengths. The laser achieves high efficiency and spectral purity, making it suitable for various applications.

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    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Materials Science

    Background:

    • Potassium gadolinium tungstate (KGd(WO(4))(2)) is a promising material for Raman lasers.
    • Efficient generation of visible light sources is crucial for numerous scientific and technological applications.

    Purpose of the Study:

    • To investigate the efficient operation of a KGd(WO(4))(2) Raman laser.
    • To explore wavelength generation in the yellow-to-red spectral region.
    • To characterize the performance of the Raman laser in terms of output power, spectral purity, and beam quality.

    Main Methods:

    • Pumping a KGd(WO(4))(2) crystal with a 1 W, 532 nm laser module.
    • Utilizing different output couplers and crystal orientations to tune the generated wavelengths.
    • Analyzing the spectral output and measuring power, purity, and beam quality.

    Main Results:

    • Generation of more than 8 wavelengths spanning the yellow-to-red region (555-658 nm).
    • Demonstration of spectrally pure output (>90%) with output power up to 400 mW.
    • Achieved high slope efficiency (up to 68%) and good beam quality (M(2)~1.5).

    Conclusions:

    • The KGd(WO(4))(2) Raman laser operates efficiently when pumped by a low-power green laser.
    • The laser system offers versatile wavelength tunability and high-quality output in the visible spectrum.
    • This work highlights the potential of KGd(WO(4))(2) for developing compact and efficient visible light sources.