... 1.Water cooling system 2.Diode pump laser 3.Mark on metal, plastic, ... media then the circulating media cools the laser cavity.Refrigerating power:1PRefrigeration unit:De-ionized water ... the international advanced semiconductor light-emitting diode. diode laser module, scanner head, beam expander, reflect lens, ... , telecommunications products, plastic buttons etc. Diode pump laser marking machine with CE