Design of micropulse-picking system with acoustic-optic modulators in mid-infrared region FEL

Manabu Heya; Yuko Fukami; Hiroyuki Nagata; Hiroaki Nunoyama; Kunio Awazu

doi:10.1117/12.428002

29 May 2001 Design of micropulse-picking system with acoustic-optic modulators in mid-infrared region FEL

Manabu Heya, Yuko Fukami, Hiroyuki Nagata, Hiroaki Nunoyama, Kunio Awazu

Proceedings Volume 4276, Commercial and Biomedical Applications of Ultrashort Pulse Lasers; Laser Plasma Generation and Diagnostics; (2001) https://doi.org/10.1117/12.428002
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States

Abstract

A micropulse-picking system attached to a free electron laser (FEL) opens a broad range of potential applications of ultrafast phenomena in medicine and biology. This paper reports the micropulse-picking system of a mid-infrared (IR) FEL at iFEL, Osaka University. We have designed the system with a germanium acousto-optic modulator (Ge-AOM), which can effectively deflect the direction of the FEL propagation due to Bragg diffraction of the FEL and radio frequency (RF) waves. The system includes a reducing optics for the FEL beam, a focusing optics onto the Ge- AOM and a micropulse-picking device (including the Ge-AOM and the RF driver). The system, which is independent on wavelength in the mid-IR region, can be realized by using the following technique: the RF frequency is carefully controlled to satisfy the Bragg angle matching over the mid-IR region. As a result, the micropulse-picking system can supply single and/or some FEL micropulses at an arbitrary repetition rate over the mid-IR region (equals 2 - 12 micrometers ) and can control the resulting peak power and average power in the ranges of approximately 1 - 2 MW and approximately 50 (mu) W - 20 mW, respectively.

Citation Download Citation

Manabu Heya, Yuko Fukami, Hiroyuki Nagata, Hiroaki Nunoyama, and Kunio Awazu "Design of micropulse-picking system with acoustic-optic modulators in mid-infrared region FEL", Proc. SPIE 4276, Commercial and Biomedical Applications of Ultrashort Pulse Lasers; Laser Plasma Generation and Diagnostics, (29 May 2001); https://doi.org/10.1117/12.428002

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