It is shown by simulations that terahertz (THz) radiation can be produced more efficiently by a mid-infrared laser pulse from a gas target. The THz amplitude is enhanced by 35 times as the laser wavelength increases from $1\mathrm{\mu m}$ to $4\mathrm{\mu m}$ ; a $4\mathrm{\mu m}$ laser at ${10}^{15}\mathrm{W}{\mathrm{cm}}^{-2}$ produces $5\mathrm{MV}/\mathrm{cm}$ THz radiation. The THz amplitude changes oscillatingly with increasing laser intensity for a given laser wavelength. In addition, the laser intensity threshold for the THz emission is lower for a longer laser wavelength.

© 2011 Optical Society of America

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