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MOPA (Master Oscillator Power Amplifier) lasers have revolutionized the world of precision laser marking, offering adjustable pulse widths that allow for vivid color marking, high-contrast photo engraving, and deep engraving across a variety of materials. This guide explores how MOPA lasers perform on metals such as gold, silver, stainless steel, titanium, and aluminum, and provides recommended marking parameters for each. 1. Key Advantages of MOPA Laser Unlike standard fiber