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Laser cooling in Yb:KY3F10: a comparison with Yb:YLF.

Stefan Püschel, Felix Mauerhoff, Christian Kränkel

    Optics Express
    |December 23, 2022
    PubMed
    Summary

    Researchers developed novel Yb3+-doped KY3F10 (Yb:KYF) crystals for all-solid-state optical cryocoolers. Yb:KYF shows superior laser cooling potential, possibly reaching below liquid nitrogen temperatures.

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    Area of Science:

    • Solid-state physics
    • Laser cooling technology
    • Materials science

    Background:

    • Laser cooling via anti-Stokes fluorescence enables all-solid-state optical cryocoolers.
    • Yb3+-doped fluoride crystals are promising laser cooling media.

    Purpose of the Study:

    • To grow and characterize novel Yb3+-doped KY3F10 (Yb:KYF) crystals for laser cooling.
    • To compare the cooling performance of Yb:KYF with Yb3+-doped LiYF4 (Yb:YLF) crystals.
    • To evaluate the potential of Yb:KYF for achieving cryogenic temperatures.

    Main Methods:

    • Growth of Yb:KYF and Yb:YLF crystals.
    • Measurement of temperature-dependent absorption and emission cross sections.
    • Measurement of fluorescence lifetime.

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  • Calculation of material figure-of-merit for laser cooling.
  • Observation of laser cooling in Yb:KYF.

    • Main Results:

    • Yb:KYF exhibits a higher figure-of-merit than Yb:YLF below 200 K.
    • The unique excitation transition in Yb:KYF is advantageous for cryogenic cooling.
    • First observation of laser cooling in Yb:KYF achieved.
    • Background absorption coefficient of ~10-4 cm-1 for Yb:KYF is among the lowest reported.
    • Model calculations predict cooling down to ~100 K is possible.

    Conclusions:

    • Yb:KYF is a promising material for advanced laser cooling applications, potentially reaching sub-boiling point of liquid nitrogen temperatures.
    • Further optimization of crystal growth and material purity can enhance Yb:KYF cooling performance.
    • Yb:KYF demonstrates significant potential for all-solid-state optical cryocoolers.