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Faraday isolator for a 100 J/10 Hz pulsed laser.

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    Optics Letters
    |June 30, 2023
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    Researchers demonstrated optical isolation for a kilowatt average power pulsed laser using a Faraday isolator. This breakthrough protects high-energy laser systems, enabling new industrial and scientific applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology

    Background:

    • High-power pulsed lasers are crucial for scientific and industrial applications.
    • Protecting laser amplifier chains from back-reflections is essential for system stability and longevity.
    • Existing optical isolation methods are often insufficient for kilowatt-class pulsed lasers.

    Purpose of the Study:

    • To demonstrate the first optical isolation of a kilowatt average power pulsed laser.
    • To develop and test a Faraday isolator capable of protecting high-energy, high-repetition-rate laser systems.
    • To assess the performance and thermal stability of the isolator under high-power operation.

    Main Methods:

    • Development of a specialized Faraday isolator.
    • Testing the isolator with a pulsed laser system delivering 100 J nanosecond pulses at a 10 Hz repetition rate.
    • Evaluation of the isolation ratio and thermal effects during an hour-long run at full power.

    Main Results:

    • Successful demonstration of optical isolation for a kilowatt average power pulsed laser.
    • The developed Faraday isolator provided a stable isolation ratio of 30.46 dB.
    • No noticeable decrease in performance due to thermal effects was observed during testing.

    Conclusions:

    • This work represents the first demonstration of optical isolation for a high-power, high-repetition-rate pulsed laser.
    • The developed Faraday isolator is effective and thermally stable, suitable for protecting powerful laser systems.
    • This advancement opens possibilities for the use of such lasers in various industrial and scientific fields.