我们对氮化铌（NbN）热电子测热辐射计（HotElectronBolometer，简称：HEB）的太赫兹（Terahertz，简称：THz）混频器的稳定性进行了研究，并探讨了相应的简易稳定方法．我们测量了HEBTHz混频器在4．2K温度下使用0．65THz本振源（LocalOscillator，简称：LO）的中频输出．为了稳定混频器的工作点，我们采用了一个具有微波补偿功能的反馈回路．在这个反馈回路里，我们使用的微波补偿频率（10GHz）远远低于NbNHEB混频器的工作频率（O．65THz），以补偿混频器的THzLO功率波动．这使系统的艾伦时间（Allantime）增加到22S以上，从而改善了系统的稳定性．
We present the results of a stabilization scheme for terahertz (THz) receivers based on niobium nitride (NbN) hot-electron bolometer (HEB) mixer. The output power of the HEB THz mixer using 0. 65 THz local oscillator at 4. 2K is measured. A feedback control loop, which actively controls the power level of the injected microwave radiation, has been successfully implemented to stabilize the operating point of the HEB mixer. In this feedback contraol loop, the microwave compensation frequency (10 GHz)is much lower than the operating frequency (0. 65 THz)of NbN HEB mixers so as to compensate for mixer current fluctuations. This allows us to increase the receiver Allan time to 22 s and improve the system stability.
参考文献
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