[23p-C202-1~7] 4.6 Terahertz Photonics

▲ [23p-C202-3] Experimental Observation of Relativistic Electron Impact Ionization
of a ZnTe Crystal

〇Masato Ota¹, Koichi Kan², Verdad Agulto¹, Mag-usara Valynn¹, Wang Youwei¹, Yasunobu Arikawa¹, Makoto Nakajima¹ (1.ILE, Osaka Univ., 2.ISIR (SANKEN), Osaka Univ.)

Keywords:Electro-optic sampling, Electron impact ionization, Relativistic electron beam

Relativistic electron impact ionization of a solid material is of great interest in various applications, e.g., interactions between a high-intensity laser and a solid, ultrafast electron microscopy, and space radiation effects in semiconductors. Here, fast electrons and electrons confined inside a solid interact and lead to subsequent avalanche ionization, which affects the electron beam transport and causes the deterioration of the material. In this research, we injected relativistic electron bunches into a zinc telluride (ZnTe) crystal and measured the impact-ionization-induced electric field inside the crystal with sub-picosecond temporal resolution by employing electro-optic (EO) sampling technique.