... machine 2.Water cooling system 3.Diode pump laser 4.CNC control Laser marking machine SampleTechnical parameters Input voltage:AC220V±20VFrequency ... the circulating media then the circulating media cools the laser cavity.Refrigerating power:1PRefrigeration unit:De-ionized water, distilled ... , figure, graphics or auto-coding, serial No., batch No., barcode, 2 -D code, etc. on metal or nonmetal surface ( ...