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

doi:10.1088/1674-1056/accf7e

中国物理B ›› 2023, Vol. 32 ›› Issue (8): 87601-087601.doi: 10.1088/1674-1056/accf7e

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

Yu He(贺羽)^1,2, Runqi Kang(康润琪)^1,2, Zhifu Shi(石致富)³, and Xing Rong(荣星)^1,2,4,†

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

收稿日期:2023-02-24 修回日期:2023-04-18 接受日期:2023-04-24 发布日期:2023-07-14
通讯作者: Xing Rong E-mail:xrong@ustc.edu.cn
基金资助:
Project supported by the Chinese Academy of Sciences (Grant Nos.XDC07000000 and GJJSTD20200001) and Hefei Comprehensive National Science Center. X. R. thanks the Youth Innovation Promotion Association of Chinese Academy of Sciences for the support.

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

Yu He(贺羽)^1,2, Runqi Kang(康润琪)^1,2, Zhifu Shi(石致富)³, and Xing Rong(荣星)^1,2,4,†

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

Received:2023-02-24 Revised:2023-04-18 Accepted:2023-04-24 Published:2023-07-14
Contact: Xing Rong E-mail:xrong@ustc.edu.cn
Supported by:
Project supported by the Chinese Academy of Sciences (Grant Nos.XDC07000000 and GJJSTD20200001) and Hefei Comprehensive National Science Center. X. R. thanks the Youth Innovation Promotion Association of Chinese Academy of Sciences for the support.

摘要/Abstract

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 dBc/Hz at 100-kHz 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

Abstract: 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 dBc/Hz at 100-kHz 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.

Key words: electron paramagnetic resonance, X-band, microwave source, automatic frequency control

中图分类号: (Electron paramagnetic resonance and relaxation)

76.30.-v

33.35.+r (Electron resonance and relaxation) 07.57.-c (Infrared, submillimeter wave, microwave and radiowave instruments and equipment) 84.40.-x (Radiowave and microwave (including millimeter wave) technology)

Yu He(贺羽), Runqi Kang(康润琪), Zhifu Shi(石致富), and Xing Rong(荣星). A low-noise X-band microwave source with digital automatic frequency control for electron paramagnetic resonance spectroscopy[J]. 中国物理B, 2023, 32(8): 87601-087601.

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

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

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