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| MOPPH073 |
Near-Infrared Free Electron Laser Experiment with the Storage Ring NIJI-IV
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147 |
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- N. Sei, H. Ogawa, K. Yamada, M. Y. Yasumoto
AIST, Tsukuba, Ibaraki
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The studies of the storage ring free electron lasers (SRFELs) and their applications have been progressed with the compact storage ring NIJI-IV at the National Institute of Advanced Industrial Science and Technology. To frontier the wavelength of the SRFEL oscillation, we have developed an infrared SRFEL with the NIJI-IV. A new optical klystron ETLOK-III, which was designed for the infrared FEL oscillations in a wavelength region of 1-10 micron, was installed in a long straight section of the NIJI-IV in 2004. Moreover, new mirror chambers were set at both ends of an optical cavity for the infrared FEL in 2007. Their stand and vibration dumper could decrease the vibration amplitude on the mirror chamber by about 80%. The amplitude of the vibrations at the cavity mirror would be controlled within 0.5 micron on the axis of the optical beam. High-reflection mirrors whose loss is below 0.1% at the wavelength around 850 nm have been obtained. The maximum FEL gain is estimated to be about 1.3% with the mirrors. We will restart experiments for near-infrared FEL oscillations in summer. In this article, recent progress of the FEL experiments with the NIJI-IV will be discussed.
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