This report shows that intense multicycle terahertz pulses can be generated in two-dimensional quasi-phase-matching structures formed by placing a binary phase mask in front of the periodically poled lithium niobate crystal. The terahertz wave is emitted perpendicular to the direction of the pump pulse propagation, which is favorable for their independent control. A terahertz peak power of 0.6 MW at a frequency of 0.5 THz is predicted for the crystal at 100 K temperature. The efficiency of the pump-to-terahertz conversion is estimated to be 1.5%, with relatively moderate pump pulse energy of 4 mJ. These results could be further improved by resonance enhancement of the pump intensity in an optical cavity or by a proper choice of the pump pulse format.

中文翻译：

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人造二维周期性极化铌酸锂中的太赫兹生成

该报告表明，通过在周期性极化的铌酸锂晶体的前面放置一个二进制相位掩模而形成的二维准相位匹配结构中，可以产生强烈的多周期太赫兹脉冲。太赫兹波垂直于泵浦脉冲传播的方向发射，这有利于它们的独立控制。在100 K温度下，晶体的太赫兹峰值功率在0.5 THz时达到0.6 MW。泵到太赫兹转换的效率估计为1.5％，泵脉冲能量相对较小，为4 mJ。这些结果可以通过在光学腔中的泵浦强度的共振增强或由泵脉冲格式的适当选择被进一步改善。