Detection of the spatiotemporal field of a single-shot terahertz pulse based on spectral holography

• Published in: Chinese physics B Vol. 23; no. 6; pp. 212 - 216
• Main Author: 王晓雷 费扬 李璐杰 王强 朱竹青
• Format: Journal Article
• Language: English
• Published: 01.06.2014
• Subjects: Bandpass filters; Charge coupled devices; Diffraction gratings; Electrooptical; Holography; Mathematical models; Sampling; Spectra; 光谱; 全息检测; 太赫兹脉冲; 带通滤波器; 时空; 电荷耦合器件; 采样理论; 飞秒激光脉冲
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/23/6/064202

According to electro-optical sampling theory, we propose a new method to detect the spatiotemporal field of a single- shot terahertz pulse by spectral holography for the first time. The single-shot terahertz pulse is coupled into a broadened chirped femtosecond pulse according to electro-optical sampling theory in the detecting system. Then the reference wave and the signal wave are split by Dammann grating and spread into the interference band-pass filter. The filtered sub-waves are at different central-frequencies because of the different incident angles. These sub-waves at different central-frequencies interfere to form sub-holograms, which are recorded in a single frame of a charge coupled device （CCD）. The sub-holograms are numerically processed, and the spatiotemporal field distribution of the original terahertz pulse is reconstructed. The computer simulations verify the feasibility of the proposed method.