When a high power amplitude modulated Gaussian laser beam propagates in a ripple density plasma then a transient transverse current is generated by transverse component of ponderomotive force exerted by laser beam on electrons that drives radiation at the modulation frequency. If the modulation frequency in the THz range then one get the high power radiation in the THz regime. If we have a seed signal in the THz regime and can modulate with the high power laser beam then we can achieve the THz radiation generation at high power with this technique . But, how to optically modulate a weak signal (THz signal) with the high power laser beam (either CO2 laser or Nd-Yag laser) ?
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