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Updated: May 3, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Yb:CaF2 thin-disk laser.

Katrin Sarah Wentsch, Birgit Weichelt, Stefan Günster

    Optics Express
    |February 12, 2014
    PubMed
    Summary
    This summary is machine-generated.

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    Ytterbium-doped CaF2 (Yb:CaF2) shows promise for high-power thin-disk lasers due to excellent thermal properties and broad emission bandwidth, enabling ultra-short pulse generation. This material achieved 250 W CW output power.

    Area of Science:

    • Laser physics
    • Solid-state materials science
    • Optoelectronics

    Background:

    • Ytterbium-doped calcium fluoride (Yb:CaF2) is explored as a novel gain medium for laser applications.
    • Thin-disk laser configurations offer advantages for high-power operation due to efficient heat dissipation.
    • Broad emission bandwidth in laser materials is crucial for generating ultra-short optical pulses.

    Purpose of the Study:

    • To investigate the potential of Ytterbium-doped CaF2 as an active material for high-power thin-disk lasers.
    • To assess the suitability of Yb:CaF2 for generating ultra-short pulses.
    • To identify and discuss challenges in fabricating and operating Yb:CaF2 thin-disk lasers.

    Main Methods:

    • Characterization of Yb:CaF2 crystal properties relevant to laser operation.

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  • Fabrication and testing of Yb:CaF2 thin-disk laser prototypes.
  • Experimental evaluation of laser performance, including output power, efficiency, and wavelength tunability.

    • Main Results:

    • Demonstrated wavelength tunability of 92 nm, confirming potential for ultra-short pulse generation.
    • Achieved 250 W continuous-wave (CW) multimode output power with 47% optical efficiency in a thin-disk configuration (3.6 mm pump spot).
    • Obtained 13 W fundamental mode output power with 34% optical efficiency using a smaller pump spot (1 mm).

    Conclusions:

    • Yb:CaF2 is a promising material for high-power thin-disk lasers, leveraging its favorable thermal and optical properties.
    • The material's broad emission bandwidth supports the generation of ultra-short laser pulses.
    • Addressing fabrication and handling challenges is key to realizing the full potential of Yb:CaF2 thin-disk lasers.