Refocus optics by changing z-height (focus on lines) Decide which A-line, overlaps which B-line Is A up or down relative to B ? Switch OFF pickup tool vacuum before pickup Touchdown tool onto scale A- switch ON vacuum. Raise arm with scale A Check alignment is as before –. To adjust the beam splitter on the FINEPLACER lambda: Perform the UAP stop point adjustment first. Rotate the x offset screw to compensate for horizontal placement errors. The following procedure assumes that. Aligning a laser beam can pose many challenges, but knowing certain tips and tricks can greatly simplify the process. You'll learn what a cube beam splitter actually does (splits one beam into two or combines two into one), what “50:50” means.