23 July 2014 A 4.7THz heterodyne receiver for a balloon borne telescope
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Abstract
We report on the performance of a high sensitivity 4.7 THz heterodyne receiver based on a NbN hot electron bolometer mixer and a quantum cascade laser (QCL) as local oscillator. The receiver is developed to observe the astronomically important neutral atomic oxygen [OI] line at 4.7448 THz on a balloon based telescope. The single-line frequency control and improved beam pattern of QCL have taken advantage of a third-order distributed feedback structure. We measured a double sideband receiver noise temperature (Trec(DSB)) of 815 K, which is ~ 7 times the quantum noise limit (hν/2kB). An Allan time of 15 s at an effective noise fluctuation bandwidth of 18 MHz is demonstrated. Heterodyne performance was further supported by a measured methanol line spectrum around 4.7 THz.
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D. J. Hayton, D. J. Hayton, J. L. Kloosterman, J. L. Kloosterman, Y. Ren, Y. Ren, T. Y. Kao, T. Y. Kao, J. R. Gao, J. R. Gao, T. M. Klapwijk, T. M. Klapwijk, Q. Hu, Q. Hu, C. K. Walker, C. K. Walker, J. L. Reno, J. L. Reno, } "A 4.7THz heterodyne receiver for a balloon borne telescope", Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91531R (23 July 2014); doi: 10.1117/12.2055790; https://doi.org/10.1117/12.2055790
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