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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

855
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...
855

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Nanosecond pulsed 620  nm source by frequency-doubling a phosphosilicate Raman fiber amplifier.

A M Chandran, T H Runcorn, R T Murray

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    |July 7, 2020
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    We developed a new nanosecond pulsed red light source at 620 nm, achieving watt-level average power. This efficient fiber laser system is ideal for advanced biomedical imaging applications.

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    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Biomedical Optics

    Background:

    • Development of high-power pulsed laser sources is crucial for advanced applications.
    • Existing red pulsed light sources often lack sufficient power or beam quality.
    • Fiber laser technology offers a robust platform for generating specific wavelengths and powers.

    Purpose of the Study:

    • To demonstrate a novel nanosecond pulsed source at 620 nm with watt-level average power.
    • To achieve high conversion efficiency in frequency-doubling a Raman fiber amplifier.
    • To provide an effective architecture for red pulsed light generation for biomedical imaging.

    Main Methods:

    • Frequency-doubling a 1240 nm phosphosilicate Raman fiber amplifier.
    • Amplifying a 1064 nm gain-switched laser diode in an ytterbium fiber master oscillator power amplifier.
    • Seeding the Raman amplifier with a continuous-wave 1240 nm laser diode for narrow-linewidth output.
    • Utilizing a periodically poled lithium tantalate crystal for frequency conversion.

    Main Results:

    • Generated a 620 nm pulsed source with watt-level average power (1.5 W maximum).
    • Achieved a pulse energy of 300 nJ at a 5 MHz repetition rate.
    • Demonstrated high conversion efficiency (up to 66%) in the Raman fiber amplifier.
    • Obtained excellent beam quality (M²≤1.16) and 20% overall optical efficiency.

    Conclusions:

    • The developed source provides high-power, narrow-linewidth red pulsed light.
    • The architecture is effective for generating red pulsed light for biomedical imaging.
    • This technology advances capabilities in optical diagnostics and imaging.