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

Hübers, Heinz-Wilhelm and Pavlov, Sergej and Richter, Heiko and Semenov, Alexei and Mahler, L. and Tredicucci, A. and Beere, Harvey and Ritchie, David and Ill'in, K. and Siegel, M. (2008) 2.5-THz heterodyne receiver with quantum cascade laser and hot electron bolometer mixer in a pulse tube cooler. In: Tagung Kryoelektronische Bauelemente 2008, p. 29. Physikalisch-Technische Bundesanstalt Braunschweig und Berlin. Tagung Kryo2008, 2008-10-06 - 2008-10-08, Königslutter - Braunschweig (Germany).

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Abstract

The terahertz (THz) portion of the elctromagnetic spectrum bears an amazing scientific potential in astronomy. High resolution spectroscopy in particular heterodyne spectroscopy of molecular rotational lines and fine structure lines of atoms or ions is a powerful tool, which allows obtaining valuable information about the observed object such as temperature and dynamical processes as well as density and distribution of particular species. Two examples are the HD rotational transition at 2.7 THz, and the OI fine structure line at 4.7 THz. These lines are main targets to be observed with GREAT, the German Receiver for Astronomy at Terahetz Frequencies, which will be operated on board of SOFIA. As part of the receiver development for about 2.5 THz. The front-end of the receiver is integrated in a pulse tube cooler (PTC). It consists of a quantum cascade laser (QCL) as local oscillator and a phonon-cooled NbN hot electron bolometric mixer. The QCL is mounted on the first stage of the PTC and operates at a temperature of about 50 K while the HEB is mounted on the second stage of the PTC (temperature about 5 K). The performance of the QCL in terms of output power, beam profile, and frequency stability as well as the noise temperature of the HEB mixer will be presented. The influence of the PTC on the receiver performance as compared to a receiver where the mixer is cooled with liquid helium will be discussed.

Document Type:Conference or Workshop Item (Speech)
Title:2.5-THz heterodyne receiver with quantum cascade laser and hot electron bolometer mixer in a pulse tube cooler
Authors:
AuthorsInstitution or Email of Authors
Hübers, Heinz-WilhelmUNSPECIFIED
Pavlov, SergejUNSPECIFIED
Richter, HeikoUNSPECIFIED
Semenov, AlexeiUNSPECIFIED
Mahler, L.Scuola Normale Superiore and NEST-INFM, Pisa/Italy
Tredicucci, A.Scuola Normale Superiore and NEST-INFM, Pisa/Italy
Beere, HarveyUniversity of Cambridge/UK
Ritchie, DavidUniversity of Cambridge/UK
Ill'in, K.University of Karlsruhe, Institute of Micro- and Nano-Electronic Systems
Siegel, M.University of Karlsruhe, Institute of Micro- and Nano-Electronic Systems
Date:October 2008
Journal or Publication Title:Tagung Kryoelektronische Bauelemente 2008
Page Range:p. 29
Editors:
EditorsEmail
Physikalisch-Technische Bundesanstalt Braunschweig und Berlin, UNSPECIFIED
Publisher:Physikalisch-Technische Bundesanstalt Braunschweig und Berlin
Status:Published
Keywords:Terahertz, heterodyn, Quantenkaskadenlaser, Hot Elektron Bolometer
Event Title:Tagung Kryo2008
Event Location:Königslutter - Braunschweig (Germany)
Event Type:national Conference
Event Dates:2008-10-06 - 2008-10-08
Organizer:Physikalisch-Technische Bundesanstalt Braunschweig und Berlin, Fachbereich Quantenelektronik
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 -- no assignement (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Dr. Heinz-Wilhelm Hübers
Deposited On:01 Dec 2008
Last Modified:27 Apr 2009 15:27

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