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Safety goggles for diy CNC laser

Astronometria

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Hi,
I am a new member.
I own a 3d printer, and I tough of upgrading my printer with a laser module for cutting and engraving things. So I bought china a 3500mw laser wich is taggued 450nm on it.
Thats was 3 years ago.
The module came with a cheap chinesse goggles, and I immediatly tough about safety. I never actually plugued it in 3 years! I started to read about safety for using lasers. 3500mw seem like a shit load of power! .The more than I read, the more I realize "OMFG how can people could sell those diy laser module without safety notice , warning and appropriate safety goggles?!"
How many peoples fryed their eyes with this? I see a lot of video on internet about modded 3d printer and hobbyist CNC laser engraver, but its all seem all right to just start the machine and see the beam engrave like its cool yeah no problem.
Man this is watts of power, this is not all right. I thank my inner safety warning voice that told me " heuuu that could be dangerous to use" and I thank the stiky post of the guy that got his beam in his eye and fryed it (sorry friend, but thank you for sharing that maybe saved me of doing bad thing).
Ok now, 3 years later, I told myself this is the time. I took the laser out of the box , stamp say :450nm 3500mw. Then I researched safety google suitable for this wavelenght and power. I find this forum this way. After reading a lot about Optical density, squared distance power, and full of cool things about laser safety, I finally bought a safety goggles for my laser.
I bought these from survivallaser :Eagle_Pair__190-540nm_OD6_Slip_Over_Laser_Safety_Goggles ( sorry cant post link I dont have enought post for this)
My question is it a good goggles for this laser? is 450nm laser are the same as 445nm? Are the 450nm leak in Infrared red? Can I would be able to focus the dot safely with these goggles?
I plan to upgrade to a 20watts laser is things go well, to actually be able to cut and not just engrave, thats googles with its OD of 6 should be enought for 3.5w and 20 watts right?

Thank you.
 



Snecho

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Yes they are the perfect goggles.

445-450 doesn't leak infrared as it is not DPSS.

445nm and 450nm are pretty much the same.

No visible diodes go up 20W so you would need new infrared blocking goggles.
 

Astronometria

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Thank you a lot. I see max power I can buy for a diode is 15 watt from ebay.
Thank you mucho
 
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What kind of diode?

Don't mean to put words in his mouth, but I've seen these listings too and they all look like disreputable branding a module containing a NUBM44-V2 (or an even weaker diode) - the ones I've seen have been the CNC head equivalent of the "worlds most brightest 10,000 MILIWAATTS laser POWER laser toy!!11!!" stuff we're used to seeing in pop up ads on websites
 

Snecho

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Don't mean to put words in his mouth, but I've seen these listings too and they all look like disreputable branding a module containing a NUBM44-V2 (or an even weaker diode) - the ones I've seen have been the CNC head equivalent of the "worlds most brightest 10,000 MILIWAATTS laser POWER laser toy!!11!!" stuff we're used to seeing in pop up ads on websites
That's what I suspected.

If the 15W module is a blue diode, that's impossible. It could be if the module is infrared with some kind of special C-Mount diode.

I never had to worry or deal with this kind stuff as my hackerspace had an 80W $10,000 Co2 laser cutter :p
 

Astronometria

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I cant post a link, but if search "15w laser cutter" in ebay youll see what I mean.
Tell me what you think of it? False advertising?
Thank you
 

Anthony P

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Both of these are out-right lies. 15Watt may be input power to diode or warning label on laser, but absolutely not optical output power.
 

Snecho

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Both of these are out-right lies. 15Watt may be input power to diode or warning label on laser, but absolutely not optical output power.
That's exactly what I was thinking. Just wanted to confirm first.
 

Astronometria

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yes it is. the rail system or the module itself, both are I think the same. The one I own is stamped 3500mw 450nm on it. What is the max ppower a blue diode can output?
 

Astronometria

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so the only right way to actually know what I own would be to dissasemble the modul itself and try to read a datasheet number on the diode itself right?
 

Snecho

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yes it is. the rail system or the module itself, both are I think the same. The one I own is stamped 3500mw 450nm on it. What is the max ppower a blue diode can output?
The absolute highest power a single blue diode can output is 7.5W.

And honestly, I would consider you lucky if your 3.5W module is putting out anywhere near there.
so the only right way to actually know what I own would be to dissasemble the modul itself and try to read a datasheet number on the diode itself right?
The only way to confirm what you have is with a laser power meter
 
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Astronometria

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ok thank you for your valuable information. I understand that I need to eat more information. I have probably lose 50$ in a garbage laser that It is probably not what it is. I will dissasembe it and try to find information on it as I don't want to light it without knowing what is it and I dont have a power meter.
By the mean time, do you have an hit of what could be a potential low cost high power laser I can build to mount on a engraver/cutter machine?
thank you
 

Snecho

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ok thank you for your valuable information. I understand that I need to eat more information. I have probably lose 50$ in a garbage laser that It is probably not what it is. I will dissasembe it and try to find information on it as I don't want to light it without knowing what is it and I dont have a power meter.
By the mean time, do you have an hit of what could be a potential low cost high power laser I can build to mount on a engraver/cutter machine?
thank you
I would buy one of those CNC heads already empty and then buy and install a 12mm module from DTR containing a 7W diode and driver.

Better yet, he sells CNC mounts to directly mount his diode modules for DIY CNCing.

Link: https://sites.google.com/site/dtrslasershop/home/diodes/xyz-mount-modules
 




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