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Complex dielectric susceptibilities of MWCNT/PE composites with various contents of nanotubes were measured using THz-TDS and cw THz BWO-spectrometer in the frequency range 100 GHz -2.2 THz and THz peak powers from microwatts to hundred kilowatts.

Series of experiments on terahertz generation from InGaN/GaN light-emitting diode heterostructures at one-and two-photon excitation by femtosecond laser pulses has been conducted. Considerable terahertz emission at two-photon excitation of the structures has been found.

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