Accurate identification of whispering gallery mode patterns of gyrotron with stabilized electro-optic imaging system
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- Accurate identification of whispering gallery mode patterns of gyrotron with stabilized electro-optic imaging system
- Lee, Ingeun; Sawant, Ashwini; Choe, Munseok; Lee, Dong Joon; Choi, EunMi
- Issue Date
- AMER INST PHYSICS
- PHYSICS OF PLASMAS, v.25, no.1, pp.013116
- The precise field pattern measurement and analysis of a typical whispering gallery mode excited in a gyrotron are important to understand the interaction physics of the gyrotron. We precisely analyzed the characteristic of a whispering gallery mode, rotating TE6,2 mode, by a photonic-assisted W-band (75-110 GHz) electro-optic imaging measurement system. The whispering gallery mode in the W-band region diverges fast in free space as it propagates from the radiation port. Therefore, scanning the field patterns of a device-under-test should be performed as close as possible to identify the device's characteristics. We successfully accomplished visualizing highly accurate field patterns of a rotating and mixed whispering gallery mode based on the measured electric field magnitude and phase by using dual optical fiber-scale electro-optic (EO) probes. We observed the distorted fields when the typical open-ended waveguide and a general EO probe were used in the extremely near-field zone, whereas a very precise field was measured in a minimally invasive way by the proposed EO probe. The measured mode patterns were quantitatively analyzed by using a cross correlation function and a mode purity equation. This work promises a way to provide accurate electric field information in the generation of the whispering gallery mode in the millimeter and submillimeter regime. Published by AIP Publishing.
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