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Updated: Dec 22, 2025

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Graphene Q-switched Tb:LiYF4 green laser.

H Chen, W Yao, H Uehara

    Optics Letters
    |May 2, 2020
    PubMed
    Summary

    This study demonstrates the first Q-switched operation of a Terbium (Tb3+)-laser. Utilizing a Tb:LiYF4 gain medium and graphene, researchers achieved efficient pulsed laser output at 544 nm.

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    Area of Science:

    • Laser Physics
    • Materials Science
    • Optoelectronics

    Background:

    • Terbium (Tb3+)-doped materials are explored for laser applications.
    • Passive Q-switching is a technique to generate high-power laser pulses.
    • Graphene is investigated as a saturable absorber for lasers.

    Purpose of the Study:

    • To report the first Q-switched operation of a Tb3+-laser.
    • To investigate the performance of a Tb:LiYF4 gain medium with a graphene saturable absorber.
    • To characterize the output parameters of the Q-switched laser.

    Main Methods:

    • A 15% Tb:LiYF4 crystal was used as the gain medium.
    • A single-layer graphene film served as the saturable absorber for passive Q-switching.
    • The laser cavity was configured for Q-switched operation at 544 nm.

    Main Results:

    • Achieved an average output power of 744 mW at 544 nm.
    • Obtained a slope efficiency of 41%.
    • Generated pulses with a width of 2.9 µs at a repetition rate of 38.7 kHz, yielding a pulse energy of 19.2 µJ and peak power of 6.6 W.

    Conclusions:

    • Successfully demonstrated the first Q-switched Tb3+-laser.
    • The combination of Tb:LiYF4 and graphene is effective for passive Q-switching.
    • The results show potential for applications requiring pulsed green laser light.

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