Help with my safety glasses

bmw · Mar 15, 2011

Hi, I recently purchased some 650nm safety goggles from zonestealth. I have a lpc815 diode that went LED:cryyy: and I'm ordering another one, but when i look at the blown diode through the safety goggles it looks the same as without.:yabbmad: so i hope that when i get the new diode the glasses will protect me. does the nm change when a diode goes LED? or do the glasses just not work?:thinking:

Thanks

Bluefan · Mar 15, 2011

Can you post a link to where you bought the goggles?

bmw · Mar 15, 2011

here it is Protection Glasses for 650nm Red Laser

Ash · Mar 15, 2011

Does the lpc815 lase at 660nm?

bmw · Mar 15, 2011

no it is 650nm but im thinking that maybe when it goes led the nm changes. that would explain why i can still see it

bmw · Mar 18, 2011

please help :anyone:

Bluefan · Mar 18, 2011

When a laser diode led's what happens is that there is not enough feedback anymore for a mode to get above threshold, usually because the facets are damaged. Then ony spontaneous emission and amplified spontaneous emission (ASE) remains, but this is of a wider spectrum, probably wide enough to have wavelengths not covered by the goggles. That could explain why it would attenuate the laser properly but lets some light through of the dead red diode.

bmw · Mar 21, 2011

i got the new diode and got everything working but when i look at the dot it is only a little dimmer with the goggles. i hope they work:cryyy:

jeffreythe00 · Mar 21, 2011

Could you maybe post a photo? :thanks:

Prototype · Mar 22, 2011

Ash said:
Does the lpc815 lase at 660nm?

Kind of late but the LPC diodes were found to lase at about 658nm.

Ash · Mar 22, 2011

bmw said:
i got the new diode and got everything working but when i look at the dot it is only a little dimmer with the goggles. i hope they work:cryyy:

As jeffrythe00 said, take a picture (or several)
One pic of the laser on a white surface, and one pic (with the goggles held infront of the camera lens) of the laser dot on the same white surface. :san: Also, a pic of the goggles themselves may help.

Prototype said:
Kind of late but the LPC diodes were found to lase at about 658nm.

Thanks for the info.
+1 Rep :thanks:

bmw · Mar 24, 2011

Here are the pics

what really worries me is that i can make black rubber smoke through the glasses

:thinkin

Ash · Mar 24, 2011

bmw said:
what really worries me is that i can make black rubber smoke through the glasses:thinking:

We can't see the pictures. But, if you can burn black rubber after you pass the laser beam through the glasses, I can assure you that your glasses do not provide sufficient eye protection against the laser. Very bad. :yabbmad:

jeffreythe00 · Mar 24, 2011

So assuming your laser is lasing at 200mw and even if your glasses are blocking 60% of the light.... then you could be getting up to 80mw of back reflections... which is NOT how safety glasses work.... you need to block enough light to bring the laser light to a safe level..... if your burning thing things through it then you might as well use sun glasses... WHICH is NOT what you do.... I would not use your laser without glasses and DEFINITELY throw those in the garbage.... I suggest if you are insistant on using your laser.... which I would not do till you can. buy a proper pair..... To hold a camera or other device over your eyes.... Like a cell camera with a LCD..... don't look through a cheapo camera from the dollar store.... Please make sure you use your laser safely.... Don't do anything That you might regret.

Thanks,
Jeff

bmw · Mar 25, 2011

What goggles go you recomend. would the dragonlasers ones work?

jeffreythe00 · Mar 26, 2011

Yes. Those glasses will work perfectly. Make sure you buy the ones that cover the correct wavelength.

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