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High-energy, 3 ps, 1.5 μm optical parametric conversion based on a periodic KTA crystals array.

Zhenling Li, Aonan Zhang, Jingya Zhang

    Optics Letters
    |December 24, 2025
    PubMed
    Summary

    We developed a compact, cavity-free infrared light source using KTA crystals. This new method generates high-energy, picosecond pulses, overcoming size limitations of traditional systems.

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    Area of Science:

    • Laser physics
    • Nonlinear optics
    • Infrared spectroscopy

    Background:

    • Conventional synchronously pumped optical parametric oscillators (SPOPOs) are limited by size.
    • Generating high-energy, few-picosecond pulses in the near and mid-infrared (NIR-MIR) requires advanced laser technology.

    Purpose of the Study:

    • To demonstrate a compact, cavity-free approach for generating high-energy, few-picosecond NIR-MIR pulses.
    • To overcome the size limitations of existing SPOPO systems.

    Main Methods:

    • Utilized a mode self-reproduction periodic array of four KTA crystals.
    • Employed a 1 MHz Nd:YVO4 MOPA system as the pump source.
    • Developed a tens of centimeters-scale device.

    Main Results:

    • Generated microjoule-level pulses from a compact device.
    • Achieved 3 picosecond pulses with 2.6 μJ energy at 1535 nm (signal).
    • Produced 0.8 μJ energy at 3467 nm (idler).

    Conclusions:

    • The demonstrated cavity-free approach offers a compact solution for high-energy, few-picosecond NIR-MIR sources.
    • This method successfully overcomes the size constraints of conventional SPOPOs.
    • The system provides high beam quality and energy-efficient pulse generation.