Nubm44 focusing lens

Hello guys, i both nubm44 and tooth it will be gait for my home made laser engraver, but it seams the diode is not focusing. I try to use some kind g2 the focus was around 2mm maybe less, then some cheep axis lens it was bit better, then 3 component now its less then 1mm but it is not round its like line. what lens they use at CLH - 5000 engraving laser head - Opt Lasers ?

Before i used OSRAM PLTB450B 450nm it was easy to focus and around 0,1mm
but the power is only 1.6w.



thanks