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Related Experiment Video

Updated: Sep 28, 2025

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Sub-three-cycle pulses at 2 µm from a degenerate optical parametric amplifier.

K R Keller, A Budweg, J Allerbeck

    Optics Letters
    |April 1, 2022
    PubMed
    Summary

    This study introduces a compact two-stage optical parametric amplifier (OPA) generating ultrashort mid-infrared pulses. The novel system significantly expands access to few-microjoule energy pulses for diverse scientific applications.

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    Area of Science:

    • Photonics and Laser Technology
    • Nonlinear Optics
    • Materials Science

    Background:

    • Ultrashort pulse generation is crucial for advanced spectroscopy and nonlinear optics.
    • Accessing mid-infrared (MIR) wavelengths with femtosecond durations remains a challenge.
    • Yb:KGW laser systems offer a robust platform for pumping optical parametric amplifiers.

    Purpose of the Study:

    • To develop a compact, two-stage optical parametric amplifier (OPA).
    • To generate ultrashort pulses in the 1.7–2.5 µm range with few-microjoule energy.
    • To leverage specific nonlinear crystals for broad phase-matching bandwidth.

    Main Methods:

    • Utilizing a two-stage optical parametric amplifier (OPA) architecture.
    • Pumping the OPA at degeneracy with the fundamental output of a Yb:KGW laser.

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    Last Updated: Sep 28, 2025

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  • Employing bismuth triborate (BiBO) and periodically poled lithium tantalate (PPLT) crystals.

    • Main Results:

    • Achieved ultrashort pulses with durations compressed to under 20 femtoseconds (fs).
    • Output pulses spanned wavelengths from 1.7 to 2.5 µm (120–176 THz).
    • Demonstrated few-microjoule pulse energies in the mid-infrared (MIR) spectral region.

    Conclusions:

    • The compact OPA system significantly broadens the availability of ultrashort MIR pulses.
    • This advancement facilitates research in areas requiring high-energy, ultrashort MIR light.
    • The use of BiBO and PPLT crystals at degeneracy is effective for achieving broad phase-matching bandwidth.