I was given a Dilas Mini 50W 808nm laser last weekend.
Machine
Nameplate

I bought some fiber and some focusing lenses.

I got them yesterday and assembled the straight lens onto the fiber.
https://i.imgur.com/Ea4p4i6.jpg
https://i.imgur.com/ABt66by.jpg
(the bag is to keep dust off of fiber and the lens.)


Everything is working out so far but Im only getting a dot of about 1mm diameter from this lens.



I am planning on using this for my laser cutter, so I will need a finer spot size than that.

I spent about 3 hours last night reading a bunch of things about laser lenses but did not find much about focusing 808nm. I still have no idea what I am doing.


Currently I am planning to pick up a generic K40 nozzle assembly and take the mirror out so I can fire straight down. This will give me a mounting spot to try out various focusing lenses and collimating lenses until I figure out the right combo of what I need.



I figured before spending a bunch of money on things that are probably not what I need I would ask here. This forum came up a LOT during my research last night and while there were a couple of posts that almost seemed like what I needed, I don't think I really understood what I was looking for so it wasn't of help to me.


Thanks in advance!