different laser source is different in selection of the expenders; here i guess that you are using CO2 . the expender should be 4X to 8X is ok.
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galvo laser marking
hello friends i am making my own galvo laser marking machine but i am confused about the laser beam expander i want to used galvo head 20mm spot with 300*300 working lens so which one beam expender i used for it if some know about it please help me my wechat ID is aqua4108363
