Laser marking is a non-contact printing method that offers advantages over other technologies including mark quality, permanence and fewer consumables. Which adopts fiber, CO2 or UV laser beam to leave permanent marks of texts, numbers, letters, logos, signs, photos, pictures, patterns on 2D or 3D surface of metals (aluminum, stainless steel, galvanized steel, carbon steel, titanium, iron, alloy, brass, copper, silver, gold), wood, fabric, leather, plastic, acrylic, glass, ABS, PCB, rubber, silicone, and polymer. This is different from ordinary inkjet printing. Laser markers have advantages of high speed, high quality, high precision, pollution-free, safety, easy operation, free maintenance and low cost.