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Proceedings Paper

Dual band 550/1200 GHz wideband spectrometer for planetary observation
Author(s): Erich T. Schlecht; Vahraz Jamnejad; Robert F. Jarnot; Bertrand Thomas; Rick Raffanti; Robert Lin
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Paper Abstract

NASA and ESA are planning missions to Jupiter and its moons. There is strong interest in a submillimeter/Terahertz spectroscopic heterodyne instrument covering the bands 520 to 600 GHz and 1100 to 1300 GHz. Therefore, we are developing a prototype instrument incorporating unique features not previously developed for planetary instrumentation. These include (1) extremely wide, rapid tunability. The Herschel/HIFI astronomical instrument, is also wideband, but far larger. It incorporates a 3.5 meter telescope on a spacecraft massing over three tons orbiting near Earth, versus our 20 kg Jupiter spectrometer. Hence, we have developed a wideband low-phase-noise synthesizer pumping two Schottky diode LO multiplier chains outputting 520 to 600 and 550 to 650 GHz. Also based on Schottky diodes are (b) 550 and 1200 GHz room temperature mixers. The high frequency mixer is subharmonically pumped; the lower balanced fundamental. To analyze the IF signals from the mixers, (c) ASIC based digital polyphase spectrometers consuming only a few Watts each are being incorporated into the instrument. Finally, since signals for both receivers come from one telescope, we include a new (d) compact dual band low-loss optical bench. It uses the fact that each receiver accepts one polarization, making a polarizing beam splitter sufficient to split the beam with minimal loss.

Paper Details

Date Published: 15 October 2012
PDF: 9 pages
Proc. SPIE 8496, Terahertz Emitters, Receivers, and Applications III, 84960U (15 October 2012); doi: 10.1117/12.930169
Show Author Affiliations
Erich T. Schlecht, Jet Propulsion Lab. (United States)
Vahraz Jamnejad, Jet Propulsion Lab. (United States)
Robert F. Jarnot, Jet Propulsion Lab. (United States)
Bertrand Thomas, Radiometer Physics GmbH (Germany)
Rick Raffanti, Techne Instruments, Inc. (United States)
Robert Lin, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 8496:
Terahertz Emitters, Receivers, and Applications III
Manijeh Razeghi; Alexei N. Baranov; Henry O. Everitt; John M. Zavada; Tariq Manzur, Editor(s)

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