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Chirped pulse waveguide amplifier.

Alexander Rudenkov, Vladimir L Kalashnikov, Maksim Demesh

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    Summary
    This summary is machine-generated.

    We developed the first ultrafast chromium-doped zinc sulfide (Cr:ZnS) waveguide amplifier. This novel amplifier achieves high gain and excellent beam quality, enabling femtosecond pulse compression and harmonic generation.

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    Area of Science:

    • Laser Physics
    • Optical Engineering
    • Materials Science

    Background:

    • Ultrafast amplifiers are crucial for scientific research.
    • Developing new materials and waveguide structures is key to advancing amplifier performance.

    Purpose of the Study:

    • To demonstrate the first ultrafast Cr:ZnS waveguide amplifier.
    • To investigate its performance in a chirped pulse amplification (CPA) system.
    • To explore novel phenomena in large-mode-area (LMA) waveguides.

    Main Methods:

    • Fabrication of a 34-mm-long depressed-cladding Cr:ZnS waveguide.
    • Implementation of a CPA scheme with a Chirped Volume Bragg Grating (CVBG) stretcher/compressor.
    • Development of a 3D numerical model accounting for pump and seed beam profiles.

    Main Results:

    • Achieved an optical gain of 75 (12 dB/cm) over 15 mm.
    • Delivered 2.35 W average output power with pulses compressed to 235 fs.
    • Observed multimode relaxation to the fundamental mode in an LMA waveguide without efficiency loss.
    • Demonstrated effective harmonic generation from 100-fs pulses in the Cr:ZnS medium.

    Conclusions:

    • The Cr:ZnS waveguide amplifier shows significant potential for ultrafast laser systems.
    • The observed multimode relaxation is a novel phenomenon in LMA waveguides.
    • The material's nonlinear properties enable integrated phase stabilization schemes.