From far-infrared to Terahertz experiments at the CLIO free-electron laser facility

The CLIO laser is working as an open users facility. Most studies up to recently were restricted to the infrared range: λ = 3-15 μm (20-100 THz), rather than Terahertz. But continuous upgrade of the laser has extended the tuning range to 3-100 THz and should achieve 2-100 THz in a near future, enabling to consider CLIO as a true Terahertz radiation source. We present the actual and future performances of the facility, and evoke its application fields.