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Huebers H-W, Pavlov S, Semenov A, Köhler R, Mahler L, Tredicucci A, et al. Terahertz quantum cascade laser as local oscillator in a heterodyne receiver. Optics Express. 2005;13(15):5890–6.
Abstract: Terahertz quantum cascade lasers have been investigated with respect to their performance as a local oscillator in a heterodyne receiver. The beam profile has been measured and transformed in to a close to Gaussian profile resulting in a good matching between the field patterns of the quantum cascade laser and the antenna of a superconducting hot electron bolometric mixer. Noise temperature measurements with the hot electron bolometer and a 2.5 THz quantum cascade laser yielded the same result as with a gas laser as local oscillator.
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