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Development of a 4.7-THz front end for the GREAT heterodyne spectrometer on SOFIA

Richter, Heiko and Pavlov, S. G. and Semenov, A. and Wienold, M. and Schrottke, L. and Biermann, K. and Hey, R. and Grahn, Holger-T. and Il'in, K. and Siegel, M. and Hübers, Heinz-Wilhelm (2012) Development of a 4.7-THz front end for the GREAT heterodyne spectrometer on SOFIA. 23rd International Symposium on Space Terahertz Technology, 2.-4. Apr. 2012, Tokyo.

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Abstract

Heterodyne spectroscopy of molecular rotational lines and atomic fine-structure lines is a powerful tool in astronomy and planetary research. It allows for the investigation of the chemical composition, the evolution, and the dynamical behaviour of astronomical objects such as molecular clouds and star-forming regions. For frequencies beyond 2 THz, SOFIA, the Stratospheric Observatory for Infrared Astronomy, is currently the only platform which allows for heterodyne spectroscopy at these frequencies. One example is the OI fine structure line at 4.7 THz, which is a main target to be observed with GREAT, the German Receiver for Astronomy at Terahertz Frequencies, on board of SOFIA. We report on the progress toward a 4.7-THz front end for the GREAT heterodyne spectrometer on SOFIA. The local oscillator (LO) combines a quantum-cascade laser (QCL) with a compact, low-input-power Stirling cooler. The 4.7-THz QCL is based on a two-miniband design and has been developed for continuous-wave operation, high output powers, and low electrical pump powers. The mixer is a phonon-cooled NbN hot electron bolometer (HEB). It consists of a 2-μm-wide, 0.2-μm-long, and 5.5-nm-thin NbN stripe on a high-resistivity (> 5 kΩ) silicon substrate located in the center of a planar logarithmic spiral antenna and glued onto the flat side of an extended hemispherical 12-mm-diameter silicon lens. In addition, we will present results obtained with a liquid-cryogen-free front end, which is integrated in a pulse-tube cooler (PTC). It is based on a QCL-LO, which is mounted on the first cold stage of the PTC, and a HEB mixer mounted on the second cold stage.

Item URL in elib:https://elib.dlr.de/78698/
Document Type:Conference or Workshop Item (Speech)
Title:Development of a 4.7-THz front end for the GREAT heterodyne spectrometer on SOFIA
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Richter, HeikoHeiko.Richter (at) dlr.deUNSPECIFIED
Pavlov, S. G. sergeij.pavlov (at) dlr.deUNSPECIFIED
Semenov, A.alexei.semenov (at) dlr.deUNSPECIFIED
Wienold, M.PDIUNSPECIFIED
Schrottke, L.PDIUNSPECIFIED
Biermann, K.PDIUNSPECIFIED
Hey, R.PDIUNSPECIFIED
Grahn, Holger-T.PDIUNSPECIFIED
Il'in, K.KITUNSPECIFIED
Siegel, M.KITUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:2 April 2012
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:THz, heterodyne, GREAT, SOFIA, QCL
Event Title:23rd International Symposium on Space Terahertz Technology
Event Location:Tokyo
Event Type:international Conference
Event Dates:2.-4. Apr. 2012
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt SOFIA (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Richter, Dr.rer.nat. Heiko
Deposited On:06 Dec 2012 08:47
Last Modified:06 Dec 2012 08:47

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