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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Compact millijoule Yb3+:CaF2 laser with 162 fs pulses.

Markus Loeser, Constantin Bernert, Daniel Albach

    Optics Express
    |April 6, 2021
    PubMed
    Summary

    We developed a compact chirped pulse amplifier (CPA) laser system for ultrafast relativistic laser-plasma research. This robust system delivers millijoule-level pulses, optimized for probing complex plasma dynamics.

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    Area of Science:

    • Laser Physics
    • Plasma Physics
    • Materials Science

    Background:

    • Ultrafast relativistic laser-plasma interactions require high-energy, short-pulse lasers.
    • Compact and robust laser systems are crucial for advanced experimental setups.
    • Chirped Pulse Amplification (CPA) is a key technique for achieving high pulse energies.

    Purpose of the Study:

    • To develop a compact, diode-pumped, chirped pulse regenerative amplifier system.
    • To optimize the system for probing ultrafast relativistic laser-plasma processes.
    • To demonstrate a robust CPA laser solution in the millijoule energy range.

    Main Methods:

    • Utilizing a chirped volume Bragg grating (CVBG) as a combined pulse stretcher and compressor.
    • Employing Yb3+:CaF2 as the gain medium for broad bandwidth support.
    • Implementing spectral gain shaping and chirped mirrors for dispersion compensation.

    Main Results:

    • Achieved a pulse duration of 162 fs.
    • Obtained an output pulse energy of 1 mJ before compression and 910 µJ after compression.
    • Demonstrated a large spectral bandwidth of 16 nm (FWHM) with Yb3+:CaF2.

    Conclusions:

    • The developed compact CPA laser system is suitable for probing ultrafast relativistic laser-plasma processes.
    • The CVBG offers a robust solution for stretcher/compressor functions in millijoule-class CPA systems.
    • Yb3+:CaF2 is an effective gain medium for broadband amplification in this laser architecture.