Terahertz heterodyne receiver with quantum cascade laser and hot electron bolometer mixer in a pulse tube cooler

Richter, H.; Semenov, A. D.; Pavlov, S. G.; Mahler, L.; Tredicucci, A.; Beere, H. E.; Ritchie, D. A.; Il’in, K. S.; Siegel, M.; Hübers, H.-W.
October 2008
Applied Physics Letters;10/6/2008, Vol. 93 Issue 14, p141108
Academic Journal
A liquid cryogen-free terahertz heterodyne receiver in a pulse tube cooler has been realized. The receiver operates at 2.5 THz. It is based on a quantum cascade laser (QCL) as local oscillator and a hot electron bolometric mixer. A detailed study of the QCL beam quality yielded a beam propagation factor of 1.1–1.2. The double sideband noise temperature of the system is 2000 K and when corrected for optical losses in the signal path it is ∼800 K.


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