A mobile, mains electricity (AC-powered) Light Amplification by Stimulated Emission of Radiation (LASER) device assembly in which input energy is used to excite dimers (typically rare gas monohalides such as argon fluoride, xenon chloride) as the active medium to emit a beam of intense, coherent, monochromatic, electromagnetic (EM) radiation intended for the intraluminal photoablation or debulking of vascular lesion material (blockages, total occlusions) and sometimes to photoablate tissue attached to the leads of active implantable devices. It is intended to be used with an angioplasty catheter and typically consists of an electrical unit with a display, controls and/or foot-switch.