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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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110-mJ 225-fs cryogenically cooled Yb:CaF2 multipass amplifier.

E Kaksis, G Almási, J A Fülöp

    Optics Express
    |December 14, 2016
    PubMed
    Summary

    This study presents a cryogenically cooled ytterbium-doped calcium fluoride (Yb:CaF2) amplifier. It achieved 110-mJ, 225-fs pulses, demonstrating a scalable design for high-energy laser systems.

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    Area of Science:

    • Laser Physics
    • Optical Engineering
    • Materials Science

    Background:

    • High-energy, ultrashort pulse lasers are crucial for scientific research and industrial applications.
    • Developing efficient and scalable laser amplifiers remains a key challenge in laser technology.

    Purpose of the Study:

    • To report on a novel diode-pumped, cryogenically cooled bulk Yb:CaF2 12-pass amplifier.
    • To demonstrate a design that mitigates spatial gain narrowing and is scalable for higher energy outputs.
    • To achieve high-energy, ultrashort pulse generation with excellent beam quality.

    Main Methods:

    • Utilized a diode-pumped, cryogenically cooled bulk Yb:CaF2 gain medium.
    • Implemented a 12-pass amplification scheme with 4f relay imaging and progressive beam magnification.

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  • Employed a double reflection grating compressor for pulse compression.
  • Housed the amplifier in a low-vacuum case to prevent nonlinear phase accumulation.

    • Main Results:

    • Delivered 110-mJ, 1030-nm pulses at a 50-Hz repetition rate.
    • Achieved a spectral bandwidth of 13 nm, compressed to 225 fs pulse duration.
    • Obtained a pulse compressor transmission efficiency of >90%.
    • Measured an output beam quality of M²<1.1.

    Conclusions:

    • The cryogenically cooled Yb:CaF2 amplifier is a highly efficient and scalable platform for generating high-energy, ultrashort laser pulses.
    • The implemented 4f relay imaging technique effectively mitigates spatial gain narrowing.
    • The low-vacuum enclosure successfully prevents nonlinear phase accumulation, ensuring high-quality pulse output.