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Terahertz generation in quasi-phase-matching structure formed by a phase mask

机译:由相位掩模形成的准相位匹配结构中的太赫兹产生

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摘要

It is theoretically shown that application of a phase mask in optical rectification scheme is equivalent to spatial modulation of the crystal's nonlinear coefficient in cross-section plane of the laser beam. It allows using the technique of quasi-phase-matching for efficient noncollinear terahertz (THz) generation by using high-power wide-aperture optical beam. According to calculations, the linewidth of THz generation can be varied from 10 GHz to a few THz by changing the optical beam size. It is shown that the frequency of THz generation can be also tuned by building the image of the phase mask in the crystal with variable magnification.
机译:从理论上讲,在光学整流方案中应用相位掩模等效于在激光束横截面上对晶体非线性系数的空间调制。它允许使用准相位匹配技术,以通过使用大功率宽孔径光束有效地产生非共线太赫兹(THz)。根据计算,通过更改光束大小,可以将THz生成的线宽从10 GHz更改为几个THz。结果表明,通过以可变放大倍数在晶体中建立相位掩模的图像,也可以调谐THz的产生频率。

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