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Efficient terahertz generation by optical rectification at 1035 nm.

Matthias C Hoffmann, Ka-Lo Yeh, János Hebling

    Optics Express
    |June 24, 2009
    PubMed
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    We achieved efficient terahertz (THz) pulse generation using tilted pulse front excitation in lithium niobate (LiNbO3). This method significantly enhances THz output compared to other materials and techniques.

    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics
    • Terahertz Science and Technology

    Background:

    • Optical rectification is a key method for generating terahertz (THz) radiation.
    • Efficient THz generation requires matching the velocities of optical and THz fields.
    • Lithium niobate (LiNbO3) is a promising material for nonlinear optical processes.

    Purpose of the Study:

    • To demonstrate efficient THz pulse generation using optical rectification.
    • To investigate the use of tilted pulse front excitation for velocity matching.
    • To compare the efficiency of THz generation in LiNbO3 with other materials like GaP and ZnTe.

    Main Methods:

    • Utilizing optical rectification of 1.03 µm wavelength laser pulses.
    • Employing tilted pulse front excitation in LiNbO3 for velocity matching.

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  • Measuring THz pulse energy, spectral bandwidth, and conversion efficiency.

    • Main Results:

    • Achieved THz pulse energies of 100 nJ with a spectral bandwidth up to 2.5 THz.
    • Obtained a conversion efficiency of 2.5x10⁻⁴ at 400 µJ pump energy and 300 fs pulse duration.
    • Demonstrated significantly higher efficiency in LiNbO3 compared to GaP and ZnTe.

    Conclusions:

    • Tilted pulse front excitation in LiNbO3 enables highly efficient THz generation.
    • Two- and three-photon absorption limit THz generation efficiency in ZnTe and GaP at high pump fluences.
    • This technique offers a substantial improvement for THz pulse generation applications.