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Sub-picosecond tunable mid-infrared light source for driving high-efficiency optical rectification.

Jinsheng Liu, Yufang Ding, Xingbin Gu

    Optics Express
    |November 29, 2023
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    Summary

    We developed a tunable mid-infrared light source to boost optical rectification (OR) efficiency for terahertz radiation generation. Simulations and experiments show optimized parameters significantly enhance OR performance.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Terahertz Science

    Background:

    • Optical rectification (OR) is a key method for generating coherent terahertz (THz) radiation.
    • Enhancing OR efficiency is crucial for practical THz applications.
    • Mid-infrared (mid-IR) light sources with specific wavelengths and pulse durations are needed for efficient OR.

    Purpose of the Study:

    • To develop a sub-picosecond mid-IR light source with tailored parameters to enhance OR efficiency.
    • To identify optimal pump wavelength and pulse duration for OR using numerical simulations.
    • To experimentally demonstrate a high-performance mid-IR light source for efficient OR.

    Main Methods:

    • Numerical simulations of OR in LiNbO3 with tilted pulse-front excitation.
    • Development of a BaGa4Se7-based optical parametric chirped-pulse amplification (OPCPA) system.
    • Utilizing a 1030-nm thin-disk laser as the pump source and broadband mid-IR seeds.

    Main Results:

    • Simulations showed that 4-µm, sub-picosecond pulses approximately double OR efficiency compared to 0.8-µm pulses.
    • The developed OPCPA system achieved >200-µJ pulse energy and ~600-fs pulse duration.
    • The light source is tunable from 3.5 to 5 µm with a 1-kHz repetition rate.

    Conclusions:

    • The optimized mid-IR light source significantly enhances optical rectification efficiency.
    • The developed light source offers high energy scalability and tunability for efficient OR in various materials.
    • This work paves the way for advanced THz generation technologies.