Recent content by Buontinh

I think my wart is gone. At least the laser is good for something other than setting things on fire which I admit can be fun. On another note, I had to buy another collimator from Thorlabs. This time it came in much bigger box as you can see why below - bigger snacks box :). The reason for...

Sure does looks pretty and sharp. Yeah, you are supposed to use a syringe and fill the ferrule hole with epoxy until it comes out the other end and then insert the fiber. I didn't have a syringe so I simply dipped the fiber in epoxy and then inserted it into the ferrule. You should also make...

Thanks. Some spots are pretty deep, but it's hard to burn it off evenly... it was basically just a test to see what it looks and feel like being burned by laser - my finger still hurt. If it grows bigger I just use those acid based warts removal as it's less painful. On another note, I had to...

I had laser surgery today, guys - at home. I have a small wart on my finger so decided to burn it with my fiber coupled laser. I thought about covering the area around the wart with something so that it only burns the wart and not my flesh, but was too lazy to do it. Anyway, I put the...

Thanks. So it's around 2.46 minutes of angle to be exact? Spot size would be around 3" at 100 meters or so? That is kind of big. When I bought that collimator I knew the beam is kind of big for cutting, but I just wanted to get something to play around with and learn. If I'm serious about...

It shows divergence of .041 degree from 966nm to 994nm. Is that considered good or not?

Does that mean the diameter of the beam coming out of this collimator should be pretty much the same at 8mm as well as 80mm? https://www.thorlabs.com/thorproduct.cfm?partnumber=F240FC-980

Yeah, these fiber laser put out tons of heat even uncollimated. If you want the beam to stay collimated at longer distance, do you have to use like at least three lenses? First one to collimate the beam, second one to expand the beam, and then final one to collimate it again? I made my cleaver...

Cool. It never gets old watching laser burn things up. I too just tried using the cutting edges of a regular wire stripper to strip the coating off and to my suprise it was pretty easy. Unfortunately, something got stuck inside the ferrule of my terminator so I tried to clear it out using the...

I don't know much about it either, but check out the following videos.

This is just for future reference... This video shows us clearly that it needs to be stripped down to the bare core. If the fiber is scored with the bare core exposed, it breaks off easily. epTzemeJjAw

Also if you don't mind spending a bit more, quality lens such as these should work great for our wavelength. https://www.ebay.com/itm/Thorlabs-C110TME-B-Mounted-Geltech-Aspheric-Lens/112922517422...

Yeah, all the info I read about terminating say the buffer does needs to be removed. There is a Youtube video showing how to remove it using a razor blade and that is what I did. I just removed enough for the core to fit through the terminator. I measured my core with a caliper and it says...

After further research, I learned that the coating on top of core/cladding is known as the primary buffer. This is the coating that got burned in my case and does needs to be removed for terminating. Also single mode fiber typically has a core diameter of 8 or 9 micron vs 50 micron or more for...

With the coating burned off, the uncoated part of the fiber is much more fragile and break easily. With most of the uncoated fiber broken off, but there is still 6mm or so intact, I tested it again today and the module still works fine. With just 1amp, it could smoke wood from a distance of 8mm...