We report on a 4.7 THz heterodyne receiver designed for high resolution spectroscopy of the astronomically important neutral oxygen (OI) line at 4.745 THz. The receiver is based around a hot electron bolometer (HEB) mixer and quantum cascade laser (QCL) local oscillator. This receiver has been developed to fly on the Stratospheric Terahertz Observatory (STO-2), a balloon-borne 0.8 m telescope observing from an altitude of 44 km for 14 days or more. We measure a double sideband receiver noise temperature of 815 K (~ 7 times quantum noise) with a noise temperature IF bandwidth of 3.5 GHz. We describe the receiver performance expected in flight and outline novel approaches to QCL amplitude and frequency stabilization.
|Title of host publication||Proceedings of 27th International Symposium on Space Terahertz Technology, ISSTT 2016|
|Publisher||International Symposium on Space Terahertz Technology (ISSTT)|
|Publication status||Published - 2017|
|Event||27th International Symposium on Space Terahertz Technology, ISSTT 2016 - Nanjing, China|
Duration: 12 Apr 2016 → 15 Apr 2016
|Conference||27th International Symposium on Space Terahertz Technology, ISSTT 2016|
|Period||12/04/16 → 15/04/16|