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We designed and built an experimental apparatus based on a time projection chamber, a novel scheme for high performance γ-ray astronomy and polarimetry in the γ → e+e− regime. This presentation focuses on the electronics aspect of the detector and, in particular, on the versatile dedicated trigger system that we have developed which allowed us to take data on beam with a high γ-conversion signal efficiency...
In this paper, we present coherent excitation of optical phonons with broadband THz pulses from laser induced plasma. GaAs wafer was excited with a single and double THz pulses, and detected with optical probe. In addition to infrared active TO phonons, we have observed oscillation at the frequency of LO phonons, we identified as upper branch of phononpolaritons.
Effects of the optical pulse shape on THz wave generation from laser induced plasma was investigated using optical pulse shaping technique. Laser induced plasma is particularly suitable media for THz pulse shaping because of a large freedom of controllable Fourier components over 10 THz. Narrow band THz wave generation was demonstrated using a square wave phase pattern added to optical pulses for...
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