@inproceedings{ddaf87de6e184283af0574ad61546f28,
title = "A 4.7THz heterodyne receiver for a balloon borne telescope",
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 (h{\^I}1/2/2kB). 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.",
keywords = "Heterodyne, Terahertz, astronomy, hot electron bolometer, quantum cascade laser",
author = "Hayton, {D. J.} and Kloosterman, {J. L.} and Y. Ren and Kao, {T. Y.} and Gao, {J. R.} and Klapwijk, {T. M.} and Q. Hu and Walker, {C. K.} and Reno, {J. L.}",
note = "Publisher Copyright: {\textcopyright} 2014 SPIE.; Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII ; Conference date: 24-06-2014 Through 27-06-2014",
year = "2014",
doi = "10.1117/12.2055790",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Jonas Zmuidzinas and Holland, {Wayne S.}",
booktitle = "Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII",
}