Abstract

We report the impulsive generation of terahertz (THz) radiation with a field amplitude of more than 1.5kVcm at megahertz repetition rates, using an interdigitated photoconducting device. The approach provides an average THz power of 190μW, corresponding to an optical-to-THz conversion efficiency of 2.5×104. Optimum conditions are achieved when the excitation spot size is of the order of the THz wavelength.

© 2006 Optical Society of America

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