M.O.P.A is Master Oscilator Power Amplifier. MOPA technology has revolutionized many industries, including medical imaging, telecommunications, and advanced material processing. MOPA fiber laser engraving machines are used for a variety of applications, such as engraving, cutting, marking, and welding. They can engrave a wide range of materials, including sensitive ones, without causing thermal damage. This is safe for those with defibrillators, pacemakers, & vagal nerve stimulator.