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    Area of Science:

    • Laser physics
    • Materials science

    Background:

    • Developing efficient and stable Q-switched lasers is crucial for various applications.
    • Thulium-doped lasers (Tm:YLF) operating around 1880 nm offer unique spectral properties.
    • Acousto-optic oscillations can limit the performance of Q-switched lasers.

    Purpose of the Study:

    • To present a novel electro-optic Q-switching scheme for a Tm:YLF laser.
    • To investigate the use of a potassium lithium tantalate niobate (KLTN) crystal for laser switching.
    • To overcome residual oscillation effects and improve laser performance at high repetition rates.

    Main Methods:

    • An electro-optic Q-switched Tm:YLF laser operating at 1880 nm was designed.
    • A trapezoidally cut potassium lithium tantalate niobate (KLTN) crystal was employed, operated near its ferroelectric phase transition.
    • The switching scheme exploited the polarization-dependent emission cross-section differences in Tm:YLF.

    Main Results:

    • Stable laser operation was achieved using the novel KLTN switching scheme.
    • Pulses of 0.81 mJ with a 30 ns duration were obtained at a 5 kHz repetition rate.
    • Pulses of 1.25 mJ with a 19 ns duration were achieved at a 500 Hz repetition rate.

    Conclusions:

    • The novel electro-optic switching scheme using KLTN is effective for Q-switched Tm:YLF lasers.
    • The method successfully suppresses residual oscillations, enabling stable high-repetition-rate operation.
    • This approach offers improved performance for 1880 nm Tm:YLF lasers.