New results of the open-quotes CLIOclose quotes infrared FEL using the new undulator open-quotes OMIRclose quotes and a hole coupling extraction

In order to extend the open-quote CLIO close-quote laser spectral range toward larger wavelength, the previous undulator open-quotes POPOOclose quotes has been replaced by a new one called open-quotes OMIRclose quotes. The new undulator has now N=38 periods of λo=5.04cm, instead of N=48 and λo=4cm. Lasing toward larger wavelength needs also a new larger undulator vacuum chamber to avoid laser diffraction. The ZnSe Brewster plate, which was initially used for laser extraction, has been replaced by a hole coupling extraction in order to allow lasing above 17μm. This paper summarizes the general performances of CLIO with this new configuration, and makes a comparison with the previous results. The laser power has been increased for the users, and the wavelength range has been extended. Two colours operating mode has also been observed with hole coupling