OSAS-B: a 4.7-THz Heterodyne Spectrometer for Atomic Oxygen in the Mesosphere and Lower Thermosphere

We present the instrumental design and results of the first flight of the Oxygen Spectrometer for Atmospheric Science from a Balloon (OSAS-B). OSAS-B is a 4.7-THz heterodyne receiver for atomic oxygen based on a hot-electron bolometer mixer and a quantum-cascade laser as local oscillator.