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We report on the realization of an active fully electronic THz camera operating at 645 GHz and room temperature. It currently acquires images with about 9000 pixels in 10 seconds. Each pixel contains the amplitude as well as the phase information of the reflected THz signal. Frequency modulation allows to select a specific working distance and to suppress spurious reflections. The typical image size...
A hybrid system for THz reflectometric imaging at 0.6 THz synchronizes a multiplied Gunn source with a femtosecond lasers for electro-optic detection and reaches 60 db dynamic range and 25 ms measurement time per pixel.
Characterization of the surface figure of technical materials by interferometry in the visible or near-IR wavelength regime becomes difficult or impossible if the surface is rough on the length scale of a tenth of the wavelength used. In this case, THz radiation can provide an interesting alternative. We demonstrate two methods for the accurate determination of the surface topography: THz heterodyne...
We report on the simulation of a terahertz optics setup with the commercial, optic-design software package Zemax. We show that the analysis of both diffraction and abberation effects are well corroborated by the experimental results.
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