期刊
APPLIED PHYSICS LETTERS
卷 102, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4774085
关键词
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资金
- NASA [NN612PK37C]
- NWO
- KNAW
- NATO SFP
- NSF
- U.S. Department of Energy, National Nuclear Security Administration [DE-AC04-94AL85000]
We report on a heterodyne receiver designed to observe the astrophysically important neutral atomic oxygen [OI] line at 4.7448 THz. The local oscillator is a third-order distributed feedback quantum cascade laser operating in continuous wave mode at 4.741 THz. A quasi-optical, superconducting NbN hot electron bolometer is used as the mixer. We recorded a double sideband receiver noise temperature (T-rec(DSB)) of 815 K, which is similar to 7 times the quantum noise limit (hv/2k(B)) and an Allan variance time of 15 s at an effective noise fluctuation bandwidth of 18 MHz. Heterodyne performance was confirmed by measuring a methanol line spectrum. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4774085]
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