Optimum excitation conditions for the generation of high-electric-field terahertz radiation from an oscillator-driven photoconductive device.
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.
Dreyhaupt
André
A
Institute of Ion Beam Physics and Materials Research, Forschungszentrum Rossendorf, Dresden, Germany. a.dreyhaupt@fz-rossendorf.de
Winnerl
Stephan
S
Helm
Manfred
M
Dekorsy
Thomas
T