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High-peak-power picosecond deep-UV laser sources.

Zijian Cui, Mingying Sun, De'an Liu

    Optics Express
    |December 16, 2022
    PubMed
    Summary

    Researchers developed high-peak-power picosecond deep-ultraviolet (DUV) laser sources using efficient harmonic generation. These advanced DUV lasers achieve record conversion efficiencies and output powers for scientific and industrial applications.

    Area of Science:

    • * Laser Physics and Photonics
    • * Nonlinear Optics
    • * Materials Science

    Background:

    • * Ultrafast deep-ultraviolet (DUV) laser sources are crucial for diverse applications including biomedicine, photolithography, and advanced scientific research.
    • * Achieving high conversion efficiency and output peak power in DUV laser generation remains a significant challenge.

    Purpose of the Study:

    • * To demonstrate high-peak-power picosecond DUV laser sources at 263.2 nm and 210.5 nm.
    • * To achieve high conversion efficiencies for fourth- and fifth-harmonic generation.
    • * To characterize deep-UV optical properties of nonlinear borate crystals.

    Main Methods:

    • * Employed efficient fourth- and fifth-harmonic generation of ultrafast lasers.
    • * Utilized various nonlinear borate crystals (e.g., BBO, LBO, CLBO) for harmonic generation.

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  • * Systematically characterized deep-UV optical properties of selected crystals.

    • Main Results:

    • * Achieved highest peak powers of 2.13 GW (6.72 ps) at 263.2 nm and 1.38 GW (5.08 ps) at 210.5 nm.
    • * Demonstrated overall conversion efficiencies of 42.9% (fourth harmonic) and 28.8% (fifth harmonic).
    • * Reported record-breaking conversion efficiencies and output peak powers for picosecond DUV laser sources.

    Conclusions:

    • * The study successfully generated high-peak-power picosecond DUV laser sources with unprecedented efficiencies.
    • * Characterization of nonlinear crystals provides valuable data for future DUV and vacuum-UV laser development.
    • * These advancements will drive progress in high-energy-density physics, material science, and laser machining.