An infrared (IR) beamline, BL43IR, at SPring-8 has been constructed for IR
spectroscopies under extreme conditions. The beamline covers a very wide ph
oton energy range in the IR region and offers a brilliant IR photon beam to
the experimental end stations. The IR light from SPring-8 is collected by
a newly designed optical system including a so-called "magic mirror". The d
esign of the optical system and the obtained results are reported. (C) 2001
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