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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term laser originated as an acronym for light amplification by stimulated emission of radiation.
A laser fiber produces endoluminal heat that destroys the vascular endothelium. In endovenous laser treatment of varicose veins, a Seldinger technique is used to advance a long catheter along the entire length of the truncal varicosity to be ablated (usually the GSV). A bare laser fiber is passed through the catheter until the end protrudes from the tip of the catheter by approximately 2 cm, and the laser fiber tip is positioned at the SFJ just distal to the subterminal valve.