We identify experimental conditions for efficient generation of THz pulses by high power near IR laser radiation: 2 TW, 30 fs, 800-nm laser pulses with their second harmonic were slightly focused in a low-pressure gas cell in such a way to avoid multiple filamentation and excessive ionization. This two-color scheme yields a microjoule level of THz pulses which is two orders of magnitude higher than the signal generated in the atmosphere of ambient air.

中文翻译：

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低压气体中的双色TW激光脉冲增强THz产生

我们确定了通过高功率近红外激光辐射有效产生THz脉冲的实验条件：将2 TW，30 fs，800 nm二次谐波的激光脉冲稍微聚焦在低压气室中，从而避免多次丝化和过度电离。这种两种颜色的方案产生的太赫兹级太赫兹脉冲，比周围空气中产生的信号高两个数量级。