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Q-switching and quasi-phase-matching using a domain structured LiNbO3 crystal.

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    A novel domain-structured lithium niobate (LiNbO3) crystal functions as both an active Q-switch and quasi-phase-matching structure. This device enables simultaneous Q-switching and wavelength conversion in lasers, producing distinct infrared pulses.

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    Area of Science:

    • Laser physics
    • Nonlinear optics
    • Materials science

    Background:

    • Active Q-switching is crucial for generating high-energy laser pulses.
    • Quasi-phase-matching (QPM) enables efficient nonlinear optical frequency conversion.
    • Integrating multiple functionalities into a single device can simplify laser systems.

    Purpose of the Study:

    • To develop a single-domain-structured lithium niobate (LiNbO3) crystal device.
    • To utilize this device as an active Q-switch and a QPM structure for wavelength conversion.
    • To demonstrate its performance in a diode-pumped Nd:YAG laser system.

    Main Methods:

    • Fabrication of a domain-structured LiNbO3 crystal.
    • Implementation of electro-optic deflection for Q-switching.
    • Utilizing quasi-phase-matched optical parametric generation for wavelength conversion.
    • Integration into a diode-pumped Nd:YAG laser.

    Main Results:

    • The device successfully performed active Q-switching via electro-optic deflection.
    • Wavelength conversion was achieved through quasi-phase-matched optical parametric generation.
    • Pulses at 1064 nm (10 ns FWHM, 195 µJ) and 1617 nm (3 ns, 15 µJ) were generated.

    Conclusions:

    • A single LiNbO3 crystal can effectively combine Q-switching and wavelength conversion.
    • This integrated device offers a compact and efficient solution for generating tunable laser pulses.
    • The demonstrated approach opens possibilities for advanced laser source development.