Has anyone else here bought the MO mirrors from saite_cutter on eBay,

Lasers
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1

Has anyone else here bought the MO mirrors from saite_cutter on eBay, specifically these ones http://r.ebay.com/bKyJ1Q

I’m wondering which side you’re supposed to use, the yellowish side, or the silver side. Mine are polished on both sides so I suppose I can use either. However, I swapped them out this morning, using the yellow side as the “face” or reflective side, and after making sure everything is aligned and focused, same power as before, and I can’t cut through 3mm Birch to save my life. Even with two passes, it barely gets to the other side at 5mm/s 12mA. I’m used to cutting Birch at around 8mm/s and 10mA with only the occasional piece not all the way through. But even at 5mm/s and 12mA, two passes should’ve gone through.

I’m about to go flip them to the silver side and try it again, before I pull them out and put the old ones back in. It just seems odd that they won’t work. Did I miss something?

2

I have Mo mirrors from lightobject and they have only one mirror finished side and that side has a yellowish tint to them. I’m pretty sure they are Mo deposited on Si. Coloring is probably related to the thickness of the Mo coating.

3

Hey buddy. The yellow’ish side is the reflecting side. I this coating is to help promote reflection of the laser beam with minimal power loss

4

yeah, yellow/gold color is the mirror side. The silver colored side is the back and isn’t polished. As mine isn’t.

5

Mine are all polished on both side. The old mirrors are only polished on one side.

6

Did you end up trying the other side?