Present Status and Perspectives of Long Wavelength Free Electron Lasers at Kyoto University

A mid-infrared Free Electron Laser (FEL) named as Kyoto University FEL (KU-FEL) has been developed for energy-related research at Institute of Advanced Energy, Kyoto University. The wavelength range of KU-FEL is 3.6 - 23 μm and opened for various user experiments. A compact THz-FEL, which consists of a photocathode RF gun, a bunch compressor, and an undulator, is now under construction. Present status and perspective of the FEL facility at Kyoto University is reported in this paper.