A 4.7THz heterodyne receiver for a balloon borne telescope
A 4.7THz heterodyne receiver for a balloon borne telescope
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用于气球载望远镜的 4.7THz 外差接收器
DOI：
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发表时间：
2014
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通讯作者：
J. Reno
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文献类型：
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作者：
D. Hayton;J. Kloosterman;Y. Ren;T. Kao;J. Gao;T. Klapwijk;Q. Hu;C. Walker;J. Reno
报道了一种基于NBN热电子测辐射热计混合器和量子级联激光器(QCL)为本振的高灵敏度4.7 THz外差接收机的性能。该接收器是为了在气球望远镜上观测4.7448太赫兹的具有天文意义的中性原子氧[OI]线而研制的。QCL的单线频率控制和改进的波束方向图利用了三阶分布式反馈结构。我们测得的双边带接收器噪声温度为815K，约为量子噪声极限(hν/2kb)的7倍。在有效噪声起伏带宽为18 MHz时，阿伦时间为15 S。外差性能还被测量到的约4.7太赫兹的甲醇线光谱所支持。
We report on the performance of a high sensitivity 4.7 THz heterodyne receiver based on a NbN hot electron bolometer mixer and a quantum cascade laser (QCL) as local oscillator. The receiver is developed to observe the astronomically important neutral atomic oxygen [OI] line at 4.7448 THz on a balloon based telescope. The single-line frequency control and improved beam pattern of QCL have taken advantage of a third-order distributed feedback structure. We measured a double sideband receiver noise temperature (Trec(DSB)) of 815 K, which is ~ 7 times the quantum noise limit (hν/2kB). An Allan time of 15 s at an effective noise fluctuation bandwidth of 18 MHz is demonstrated. Heterodyne performance was further supported by a measured methanol line spectrum around 4.7 THz.