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We have developed a micro-spectrometer operating in the THz-range between 30GHz and 1.4THz, where we use backward-wave oscillators as continuous-wave sources, which supply highly monochromatic (Δν /ν≈10 −6 ) and coherent radiation with an output power of up to 300mW. The microscopic unit consists of an aberration-free hyperbolic lens, a hemispherical solid immersion lens and a small pinhole...
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