The UCSB Free Electron laser source offers high power terahertz radiation. The primary radiation source consists of two fully operational FELs, the MM-FEL and the FIR-FEL, covering the range of 2.5 mm to 63 µm (4 to 160 cm-1 or 120 GHz to 4.75 THz). These are connected to a users' laboratory by a vacuum optical transport system. Twelve switchable output ports allow multiple experimental setups.