High-resolution terahertz (THz) heterodyne spectroscopy is an important technique in astronomy. So far frequencies above 2.5 THz could not be accessed by this technique because of the lack of a suitable local oscillator. A novel local oscillator based on a THz quantum-cascade laser allows for the observation of the fine-structure line of neutral atomic oxygen at 4.7448 THz. The local oscillator has been implemented in the GREAT (German REceiver for Astronomy at Terahertz frequencies) spectrometer on SOFIA, the Stratospheric Observatory for Infrared Astronomy. The design and the performance of the local oscillator will be presented.
Heinz-Wilhelm Hübers, Heiko Richter, Martin Wienold, Lutz Schrottke, Klaus Biermann, and Holger T. Grahn, "The 4.7-THz quantum-cascade laser local oscillator on SOFIA (Conference Presentation)," Proc. SPIE 10123, Novel In-Plane Semiconductor Lasers XVI, 1012314 (Presented at SPIE OPTO: February 01, 2017; Published: 20 April 2017); https://doi.org/10.1117/12.2253577.5398643858001.
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