Optimum excitation conditions for the generation of high-electric-field terahertz radiation from an oscillator-driven photoconductive device |
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| Authors: | Dreyhaupt André Winnerl Stephan Helm Manfred Dekorsy Thomas |
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| Institution: | Institute of Ion Beam Physics and Materials Research, Forschungszentrum Rossendorf, Dresden, Germany. a.dreyhaupt@fz-rossendorf.de |
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| Abstract: | We report the impulsive generation of terahertz (THz) radiation with a field amplitude of more than 1.5 kV/cm at megahertz repetition rates, using an interdigitated photoconducting device. The approach provides an average THz power of 190 microW, corresponding to an optical-to-THz conversion efficiency of 2.5 x 10(-4). Optimum conditions are achieved when the excitation spot size is of the order of the THz wavelength. |
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