テーパーアンジュレータから生成されたチャープ波パケットの直接電場再構成のためのスペクトル位相干渉法

Takao Fuji, Takashi Tanaka, Tatsuo Kaneyasu

|December 15, 2025

Abstract:

Tapered undulators are designed to generate broadband, chirped radiation for advanced synchrotron light sources. However, the complete electric-field waveform of the radiation has never been directly measured. Here, we report the first, to the best of our knowledge, direct characterization of a chirped wavepacket generated from a tapered undulator using spectral phase interferometry for direct electric-field reconstruction (SPIDER). The retrieved spectral phase reveals a distinct linear chirp, and its magnitude shows essential agreement with theoretical predictions. This work provides the first experimental validation of the chirped waveform generated from an undulator, enabling advanced temporal control of next-generation light sources.

キーワード:

テーパーアンジュレータチャープ波パケットスペクトル位相干渉法電場再構成自由電子レーザーシンクロトロン放射光

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