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Related Experiment Video

Updated: Dec 7, 2025

Using a 1064-nm Picosecond Neodymium-Doped Yttrium Aluminum Garnet Laser for Periorbital Hyperpigmentation
04:43

Using a 1064-nm Picosecond Neodymium-Doped Yttrium Aluminum Garnet Laser for Periorbital Hyperpigmentation

Published on: May 23, 2025

587

Highly efficient 110-W closed-cycle cryogenically cooled Nd:YAG laser operating at 946  nm.

G Shayeganrad, S Cante, J P Mosquera

    Optics Letters
    |October 1, 2020
    PubMed
    Summary

    Researchers achieved a record 110W output from a 946 nm Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser. This high-power laser system demonstrates 80% slope efficiency and 74% optical-to-optical efficiency.

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    Area of Science:

    • Laser Physics
    • Solid-State Lasers
    • Materials Science

    Background:

    • High-power diode-pumped solid-state lasers are crucial for various applications.
    • Achieving high efficiency and output power in lasers, particularly at specific wavelengths like 946 nm, presents significant challenges.
    • Nd:YAG lasers are widely used but require efficient pumping and cooling for optimal performance.

    Purpose of the Study:

    • To report a new record power and efficiency for a 946 nm Nd:YAG laser.
    • To demonstrate a practical laser system capable of sustained operation.
    • To investigate the impact of cryo-cooling and direct in-band pumping on laser performance.

    Main Methods:

    • Utilized a closed-cycle acoustic Stirling cryostat to cool the Nd:YAG gain medium to approximately 80 K.

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    Last Updated: Dec 7, 2025

    Using a 1064-nm Picosecond Neodymium-Doped Yttrium Aluminum Garnet Laser for Periorbital Hyperpigmentation
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  • Employed direct in-band pumping at 868 nm using a volume-Bragg-grating stabilized diode laser bar.
  • Characterized laser output power and efficiency with respect to absorbed pump power and incident power.

    • Main Results:

    • Achieved a record output power exceeding 110 W with a power density of 5 TWm⁻²sr⁻¹.
    • Demonstrated a slope efficiency of 80% with respect to absorbed pump power.
    • Attained an optical-to-optical efficiency of 74% with respect to incident pump power.

    Conclusions:

    • The developed 946 nm Nd:YAG laser system sets new benchmarks for power and efficiency.
    • Cryo-cooling and direct in-band pumping are effective strategies for enhancing laser performance.
    • The system exhibits stable daily operation, comparable to conventional water-cooled systems.