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A THz ultrashort pulse system with 128 emission and detection channels based on photoconductive antennas is presented. The efficient excitation of each photoconductive antenna is obtained by micro-optics.
The generation of picosecond electromagnetic pulses in the frequency range of 100 GHz to above 10 THz using ultrashort laser pulses is a well established technique by now. Over the past years, several different attempts have been made to increase the THz efficiency and output power, respectively. Especially, tomographic applications and spatial resolved spectroscopy require powerful THz radiation...
For THz ultrashort pulse imaging a high scan speed in combination with a high signal/noise ratio is required. Several methods have been presented to accelerate the classical one channel THz pulse detection. For example 2D electrooptic sampling provides a short scan time, but the signal/noise ratio is low and there is a need for an expensive low repetition fs-laser amplifier system to generate high...
We present multichannel THz ultrashort pulse detection by a photoconductive antenna array consisting of 16 photoconductive antennas. The efficient excitation of the photoconductive antennas has been realized by a microlens array which creates 16 single spots from the exciting fs-laser beam. The detected THz signal/noise ratio has been improved by an order of magnitude in comparison to an excitation...
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