hello, i'm interested in make an fibre laser to engrave in aluminum, however in all foruns where i ask this question everyone sugest me to buy an professional machine. but i'm interested in learn more about this tecnology so i would like to make my own fibre laser. of course some componets i know they should be necessary buy. i found this project: http://184.108.40.206/staff/mcsele/lasers/LasersTEA.htm to engrave in aluminum however people advised me fibre laser is better to engrave in metal pieces. this LasersTEA prototype engraved in aluminum mixing nitrogen and helium gases. some one have an idea how to do an homemade fibre laser? or could give some opinion if this is a best laser type?