Key Technology For Electric Field Measurement Based On Rydberg Atom

In recent years,with the development of microwave electric field detection technology,to achieve high sensitivity,high detection accuracy detection has become the current hot spot,based on the Rydberg atomic electric field detection came into being,this detection method abandoned the traditional detection method in the system noise temperature on the sensitivity of the impact,the sensitivity of the system is no longer related to the strength of the coupling,greatly improving the detection accuracy and sensitivity.In this thesis,the key technology for electric field measurement based on Rydberg atom is used to design and process the electrical system part of the Rydberg atom electric field measurement,build and debug the optical platform,and observe the spectral signal of the detection light transmission spectrum needed for the subsequent work through the spectrometer.Details are as follows.1.Design of high-performance sideband steep frequency selective surface.The frequency selective surface has the function of realising spatial filtering of microwave signals so that the desired signal enters the vapour cell and filters out electromagnetic interference signals from other frequency bands in space.The measured passband range of the frequency selective surface is 8.95GHz～10.55 GHz,with passband insertion loss below 1.5d B and out-of-band suppression system higher than 20 d B.2.Design of microstrip bandpass filter.The bandpass filter has the function of preliminary filtering of microwave signals.The measured passband frequency range of the filter is 9.6GHz～10.6GHz,the return loss is better than 11.8d B,the insertion loss is less than 2.8d B,and the out-of-band suppression system is higher than 20 d B.3.Design of microstrip filtering antenna.The filter antenna has the function of further filtering the microwave signal,providing gain and amplifying the output signal.The 13 d B return loss of the filter antenna has a passband range of 9.83GHz～10.15 GHz,with a maximum gain of 6.92 d Bi at 10 GHz.The 3D directional plot performance deviates from the simulation,and the measured gain curve with frequency shows good filtering performance.4.Commissioning the optical system and acquiring the spectral signal of the detected light transmission spectrum.After completing the electrical system design,the optical platform was built and commissioned,and the spectral signal of the detected light transmission spectrum was initially observed and acquired by the spectrometer.In summary,this thesis has completed the design of the microwave electrical system and obtained the spectral signal for the detection of the optical transmission spectrum,which has laid the foundation for the final completion of the Rydberg atomic electric field measurement.