A low-noise X-band microwave source with digital automatic frequency control for electron paramagnetic resonance spectroscopy  

作　　者：贺羽 康润琪 石致富 荣星 Yu He;Runqi Kang;Zhifu Shi;Xing Rong(CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Chinainstru&Quantumtech(Hefei)Co.,Ltd,Hefei 230031,China;Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China)

机构地区：[1]CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China [3]Chinainstru&Quantumtech(Hefei)Co.,Ltd,Hefei 230031,China [4]Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China

出　　处：《Chinese Physics B》2023年第8期46-51,共6页中国物理B（英文版）

基　　金：Project supported by the Chinese Academy of Sciences(Grant Nos.XDC07000000 and GJJSTD20200001);Hefei Comprehensive National Science Center;Youth Innovation Promotion Association of Chinese Academy of Sciences for the support。

摘　　要：We report a new design of microwave source for X-band electron paramagnetic resonance spectrometer.The microwave source is equipped with a digital automatic frequency control circuit.The parameters of the digital automatic frequency control circuit can be flexibly configured for different experimental conditions,such as the input powers or the quality factors of the resonator.The configurability makes the microwave source universally compatible and greatly extends its application.To demonstrate the ability of adapting to various experimental conditions,the microwave source is tested by varying the input powers and the quality factors of the resonator.A satisfactory phase noise as low as-135 d Bc/Hz at 100-k Hz offset from the center frequency is achieved,due to the use of a phase-locked dielectric resonator oscillator and a direct digital synthesizer.Continuous-wave electron paramagnetic resonance experiments are conducted to examine the performance of the microwave source.The outstanding performance shows a prospect of wide applications of the microwave source in numerous fields of science.

关 键 词：electron paramagnetic resonance X-BAND microwave source automatic frequency control 

分 类 号：O482.533[理学—固体物理]