電界誘起第二高調波の位相分布による電圧極性判定と電界分布推定

カテゴリ：部門大会

論文No：080

グループ名：【B】令和7年電気学会電力・エネルギー部門大会

発行日：2025/9/5

タイトル(英語)：Polarity determination and electric field profile inference based on the phase distribution of electric-field-induced second-harmonic generation

著者名：佐藤丈尚（東京大学），梅本貴弘（東京大学），佐藤正寛（東京大学），藤井隆（東京大学），熊田亜紀子（東京大学）

著者名(英語)： Takenao Sato (The University of Tokyo), Takahiro Umemoto (The University of Tokyo), Masahiro Sato (The University of Tokyo), Takashi Fujii (The University of Tokyo), Akiko Kumada (The University of Tokyo)

キーワード：レーザ,電界誘起第二高調波,電界計測,位相計測,極性,Laser,Electric-field-induced second-harmonic generation,Electric field measurement,Phase measurement,Polarity

要約(日本語)：The electric-field-induced second-harmonic generation (E-FISHG) technique has attracted attention as a non-invasive, non-contact optical method for measuring electric fields. However, there has been limited research on determining the polarity of electric fields. This is partly because direct measurement of E-FISH intensity does not provide phase information, as the signal intensity is proportional to the square of the induced polarization. Although some studies have inferred polarity based on the brightness of interference fringes, the relationship between the electric field distribution and its phase is not well understood. In this study, we investigate how the phase changes in response to different electric field profiles and show that even electric fields with the same polarity can exhibit a phase shift of π radians depending on their spatial configuration. This result indicates that phase information alone is not sufficient to determine polarity; the intensity distribution must also be taken into account. Using this polarity identification approach, we successfully estimated electric field distributions with opposite polarities, achieving a peak accuracy of 91.3%.

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