H. Richter, A. Semenov, S. Pavlov, L. Mahler, A. Tredicucci, H. Beere, D. Ritchie, K. Il'in, M. Siegel, H. Hubers
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Frontend for a 2.5-THz heterodyne spectrometer without liquid cryogen
As part of a study for a second generation heterodyne spectrometer on SOFIA we are developing a 2.5-THz frontend which is implemented in a pulse-tube cooler. It consists of a quantum-cascade laser as local oscillator and a phonon-cooled NbN hot electron bolometric mixer. Frequency stabilization to below 300 kHz full width at half maximum is achieved by locking to a molecular absorption line. We will present the design and performance of the frontend and discuss the prospects for an application on board of SOFIA.
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