Hot electron bolometer heterodyne receiver with a 4.7-THz quantum cascade laser as a local oscillator
Hot electron bolometer heterodyne receiver with a 4.7-THz quantum cascade laser as a local oscillator
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DOI：
10.1063/1.4774085
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发表时间：
2012-08
影响因子：
4
通讯作者：
J. Kloosterman;D. Hayton;Yuan Ren;T. Kao;N. Hovenier;Jiansong Gao;T. Klapwijk;Q. Hu;C. Walker;J. Reno
中科院分区：
文献类型：
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作者：
J. Kloosterman;D. Hayton;Yuan Ren;T. Kao;N. Hovenier;Jiansong Gao;T. Klapwijk;Q. Hu;C. Walker;J. Reno
我们报道了一个外差接收器，它被设计用来观测在4.7448太赫兹的天体物理意义上重要的中性原子氧[OI]线。本机振荡器是一个工作在4.741太赫兹连续波模式下的三阶分布反馈量子级联激光器。混合器采用准光学超导NbN热电子测辐射热计。在18 MHz的有效噪声起伏带宽下，我们记录到了815K的双边带接收机噪声温度(T-rec(Dsb))，这与量子噪声极限(hv/2k(B))的7倍和Allan方差时间为15 S相似。外差性能通过测量甲醇线光谱得到证实。(C)2013年美国物理研究所。[http://dx.doi.org/10.1063/1.4774085]
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]