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Updated: Sep 13, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Efficient 320 nm continuous-wave ultraviolet Pr:LiYF4 laser via optimized pump beam reshaping.

Shengyuan Pan, Zeqian Jiang, Jinming Huang

    Optics Express
    |July 30, 2025
    PubMed
    Summary

    This study demonstrates a pump beam reshaping system to improve laser output power. By enhancing mode overlap, it achieved efficient 640 nm and 320 nm laser outputs, paving the way for ultraviolet lasers.

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    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Materials Science

    Background:

    • Mode overlap efficiency is crucial for laser output power.
    • Laser diode (LD) pumping is a common method for laser excitation.
    • Efficient ultraviolet (UV) laser generation is desirable for various applications.

    Purpose of the Study:

    • To develop a pump beam reshaping system to enhance mode overlap efficiency.
    • To improve the output power and efficiency of a Pr3+:LiYF4 laser.
    • To achieve efficient frequency doubling for UV laser generation.

    Main Methods:

    • Implemented a pump beam reshaping system to adjust laser diode pump beam waist size and divergence.
    • Utilized a Pr3+:LiYF4 laser medium.
    • Employed a single lithium triborate (LBO) crystal for frequency doubling.

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    Main Results:

    • Achieved 4.33 W output power and 51.9% slope efficiency for the Pr3+:LiYF4 laser at 640 nm.
    • Obtained 1.91 W output power and 23.1% slope efficiency for the frequency-doubled UV laser at 320 nm.
    • Demonstrated a compact and efficient UV laser system.

    Conclusions:

    • The pump beam reshaping system effectively enhances mode overlap efficiency.
    • The developed system enables efficient generation of visible and ultraviolet laser light.
    • This approach offers a feasible method for realizing efficient LD-pumped UV lasers.