Design and Experiment of a Quasi-Optical Mode Converter

YANG Chen; GUO Wei; LI Wenqi; ZHANG Zhiqiang; LUO Jirun; ZHU Min

doi:10.11999/JEIT210347

Volume 44 Issue 7

Jul. 2022

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Article Navigation > Journal of Electronics & Information Technology > 2022 > 44(7): 2592-2601

YANG Chen, GUO Wei, LI Wenqi, ZHANG Zhiqiang, LUO Jirun, ZHU Min. Design and Experiment of a Quasi-Optical Mode Converter[J]. Journal of Electronics & Information Technology, 2022, 44(7): 2592-2601. doi: 10.11999/JEIT210347

Citation:

YANG Chen, GUO Wei, LI Wenqi, ZHANG Zhiqiang, LUO Jirun, ZHU Min. Design and Experiment of a Quasi-Optical Mode Converter[J]. Journal of Electronics & Information Technology, 2022, 44(7): 2592-2601. doi: 10.11999/JEIT210347

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Design and Experiment of a Quasi-Optical Mode Converter

doi: 10.11999/JEIT210347

YANG Chen^{1, 2
,
,},
GUO Wei¹,
LI Wenqi^{1, 2},
ZHANG Zhiqiang¹,
LUO Jirun^{1, 2},
ZHU Min¹

1.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: The National Key R&D Program of China (2017YFE0300202, 2017YFE0300200)

Received Date: 2021-04-23
Rev Recd Date: 2021-08-26

Available Online: 2021-09-15

Publish Date: 2022-07-25

Abstract

Abstract

Quasi-optical mode converter is an important component to realize the high-efficiency output for a high-power gyrotron oscillator. In this paper, design and experiments of a quasi-optical mode converter, consisting of a Denisov-type launcher and three quasi-optical mirrors, are carried out for the development of 140 GHz/TE_28,8 mode gyrotron oscillator. Based on scalar diffraction method, the field distribution at the radiation aperture of the Denisov-type launcher is optimized to make the vector correlation of the aperture field with the ideal Gaussian field reach 96.2%. Based on the geometric optics method and the Gaussian beam matching method, the focusing mirror and the beam shaping mirrors are designed. A 3D full-wave analysis software Surf3D is used to obtain the field distribution on each mirror surface and the output window, which shows that the output beam with Gaussian mode content of 96.67% is obtained at the output window. The total power conversion efficiency of the quasi-optical mode converter is 93.98%. The design and experiments of the quasi-optical mode converter are performed to use the output signal of the self-developed TE_28,8 mode generator as its input one under the conditions of the simulated demonstration for its conversion characteristics and the strict control for machining precision as well as the process of the converter assemble and testing. The tested results indicate that the design is in good agreement with the experiment, which is helpful for engineering design and experimental demonstration of the quasi-optical mode converter development.
- Quasi-optical mode converter,
- Denisov-type launcher,
- Gaussian mode content,
- Cold experiment

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References(30)

References

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