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Pump pulse width and temperature effects in lithium niobate for efficient THz generation.

C Vicario, B Monoszlai, Cs Lombosi

    Optics Letters
    |December 11, 2013
    PubMed
    Summary

    This study demonstrates efficient terahertz (THz) generation in lithium niobate using a Ytterbium-doped calcium fluoride (Yb:CaF2) laser. Researchers optimized pump parameters, achieving broadband THz output by varying pulse duration and crystal temperature.

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    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics
    • Laser Science

    Background:

    • Terahertz (THz) generation is crucial for various applications, requiring optimized laser sources and nonlinear media.
    • Lithium niobate is a promising material for nonlinear optical processes, including THz wave generation.
    • Yb:CaF2 lasers offer unique properties for pumping nonlinear optical processes due to their tunability and high energy output.

    Purpose of the Study:

    • To investigate the efficiency and spectral characteristics of THz generation in lithium niobate.
    • To determine the optimal pump parameters (pulse duration, crystal temperature) for efficient and broadband THz generation.
    • To experimentally validate theoretical predictions regarding laser-pumped THz generation.

    Main Methods:

    • Utilizing a Yb:CaF2 laser system delivering transform-limited pulses (0.38-0.65 ps) at 1030 nm with up to 15 mJ pulse energy.
    • Experimentally studying THz generation in lithium niobate by varying pump pulse durations.
    • Investigating the effect of different crystal temperatures (down to 25 K) on THz output.
    • Analyzing the conversion efficiency and spectral shape of the generated THz radiation.

    Main Results:

    • Demonstrated efficient THz generation in lithium niobate pumped by the Yb:CaF2 laser.
    • Identified optimal pump pulse durations and crystal temperatures for maximizing THz conversion efficiency.
    • Observed broadband THz spectral characteristics influenced by pump parameters and crystal temperature.
    • Experimentally confirmed theoretical expectations for efficient THz generation with the specified laser parameters.

    Conclusions:

    • The Yb:CaF2 laser system is well-suited for efficient THz generation in lithium niobate.
    • Optimizing pump pulse duration and crystal temperature is critical for achieving high-efficiency and broadband THz output.
    • This research provides valuable insights for developing advanced THz sources for scientific and technological applications.