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Updated: Sep 23, 2025

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Tunable and coherent terahertz source based on CdSiP2 crystal via collinear difference frequency generation.

Yang Li, Jingguo Huang, Zhiming Huang

    Optics Letters
    |May 13, 2022
    PubMed
    Summary

    Cadmium Silicon Phosphide (CdSiP2) crystals efficiently generate tunable terahertz (THz) radiation. This study demonstrates their potential for broadband THz applications using difference frequency generation.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Solid-State Physics

    Background:

    • CdSiP2 (CSP) crystals are recognized for their optical conversion properties.
    • Terahertz (THz) radiation generation is crucial for various scientific and technological applications.
    • Efficient and tunable THz sources are in high demand.

    Purpose of the Study:

    • To investigate the optical properties of CdSiP2 crystals.
    • To experimentally demonstrate THz radiation generation using CSP.
    • To evaluate CSP as a candidate for THz difference frequency generation (DFG).

    Main Methods:

    • Crystal growth using the vertical Bridgman method.
    • Optical property measurement with terahertz time-domain spectroscopy (THz-TDS) from 0.2-3 THz.

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  • Generation of THz radiation via difference frequency generation (DFG) using a nanosecond Q-switched Nd:YAG laser and an optical parametric oscillator (OPO).

    • Main Results:

    • Broadband, tunable, monochromatic THz radiation generated from 0.08 to 1.68 THz.
    • Achieved output power of 26.6 mW at 0.74 THz.
    • Observed conversion efficiency of 1.4 × 10⁻⁷ at 0.74 THz.

    Conclusions:

    • CdSiP2 is a promising material for efficient terahertz DFG.
    • The demonstrated THz generation capabilities support CSP's use in outdoor applications.
    • Further research into CSP for THz applications is warranted.