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We propose a novel method for establishing and aligning a THz ellipsometry system and for calibrating ellipsometry signals for precise THz ellipsometry measurements. The method significantly improves the THz ellipsometry accuracy compared to the current publications.
We demonstrate a video-rate THz-imaging system based on upconversion of THz pulses into the infrared. Sideband generation by mixing high-power, narrowband THz pulses with picosecond pulses at 1064 nm in QPM-GaAs provide high contrast imaging.
We demonstrate tunable (0.8–2.8 THz) narrow-band THz waves using fiber-laser pumped ring cavity, near-degenerate type 0 or type II PPLN OPO's. Over 130 μW (120 μW) of stable CW THz waves were generated at 1.5 (0.8) THz in a periodically-inverted gallium arsenide sample using intracavity difference frequency generation with the type 0 (II) OPOs.
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