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Proceedings Paper

Design of micropulse-picking system with acoustic-optic modulators in mid-infrared region FEL
Author(s): Manabu Heya; Yuko Fukami; Hiroyuki Nagata; Hiroaki Nunoyama; Kunio Awazu
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Paper 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.

Paper Details

Date Published: 29 May 2001
PDF: 8 pages
Proc. SPIE 4276, Commercial and Biomedical Applications of Ultrashort Pulse Lasers; Laser Plasma Generation and Diagnostics, (29 May 2001); doi: 10.1117/12.428002
Show Author Affiliations
Manabu Heya, Osaka Univ. (Japan)
Yuko Fukami, Osaka Univ. (Japan)
Hiroyuki Nagata, Osaka Univ. (Japan)
Hiroaki Nunoyama, Osaka Univ. (Japan)
Kunio Awazu, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 4276:
Commercial and Biomedical Applications of Ultrashort Pulse Lasers; Laser Plasma Generation and Diagnostics
Richard F. Haglund Jr.; Richard F. Haglund Jr.; Richard F. Wood; Joseph Neev; Richard F. Wood, Editor(s)

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