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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

948
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...
948

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Related Experiment Video

Updated: Jan 1, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Frequency doubling of multimode diode-pumped GRIN-fiber Raman lasers.

A G Kuznetsov, E A Evmenova, E I Dontsova

    Optics Express
    |December 28, 2019
    PubMed
    Summary

    Researchers achieved efficient blue light generation by frequency doubling a diode-pumped fiber laser. This method improved beam quality, yielding significant output power for the blue spectral range.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Diode-pumped solid-state lasers are crucial for various applications.
    • Efficient frequency conversion is key to accessing new spectral ranges.
    • Improving beam quality enhances laser performance and applicability.

    Purpose of the Study:

    • To investigate frequency doubling of a diode-pumped GRIN-fiber Raman laser.
    • To enhance the beam quality (M² < 2.6) of the generated blue light.
    • To achieve efficient blue light generation in a single-pass scheme.

    Main Methods:

    • Utilized a simple single-pass scheme for frequency doubling.
    • Employed a 5-mm periodically poled lithium niobate (PPLN) crystal.
    • Optimized the experimental setup to mitigate back reflections and crystal heating.

    Main Results:

    • Demonstrated frequency doubling of a multimode diode-pumped GRIN-fiber Raman laser.
    • Achieved improved beam quality with M² values ranging from 1.9 to 2.6.
    • Obtained efficient conversion to the blue spectral range with output powers of 0.4 W at 488 nm and 0.64 W at 477 nm.

    Conclusions:

    • The optimized single-pass frequency doubling scheme is effective for generating blue light.
    • The improved beam quality is advantageous for potential applications.
    • This work presents a viable method for efficient blue light generation from fiber lasers.