Old 08-16-2009, 12:15 AM #17
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Default Re: VIDEO 1W Labby burning some things

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Originally Posted by sbdwag View Post
Got my cylinder lens today thanks everyone for their help. Now Ive got a real burner.

Heres a video I just uploaded showing several things smokin.

YouTube - 1W 808nm laser burning


regards
sbdwag
Pretty nice laser you got there! One day I'll move on to something like that, and even better in an attempt to accomplish my life long dream of setting the moon on fire (kidding!)! I noticed that as your moved "victims" into the beam, the dot appeared to be a pinkish color in the video. That pinkish color is only visible because of the camera, correct?


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Old 08-16-2009, 01:36 AM #18
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Default Re: VIDEO 1W Labby burning some thinks

Yep the pink dot is the camera sensitivity to that freq of IR. Not visible to the naked eye. In low light there is a very dark red output that is slightly visible which helps in focusing. You must remember even thought you cannot see it the IR radiation is there. Imagine shining a red or greed dot onto a surface at 1000mw's of power how difficult that would be to your eyes. Now imagine not being able to see that radiation but it is still there. Thats whats happening with 808nm. When I am focusing without safetyware on I have a flat black background to absorb and IR that might reflect back onto my eyes.

When the laser burns it creates a white hot point of intense visible light you are also seeing that in the video.

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Last edited by sbdwag; 08-29-2009 at 01:44 PM.
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Old 08-16-2009, 01:52 AM #19
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Default Re: VIDEO 1W Labby burning some thinks

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Originally Posted by sbdwag View Post
Yep the pink dot is the camera sensitivity to that freq of IR. Not visible to the naked eye. In low light there is a very dark red output that is slightly visible which helps in focusing. You must remember even thought you cannot see it the IR radiation is there. Imagine shining a red or greed dot onto a surface at 1000mw's of power how difficult that would be to your eyes. Now imagine not being able to see that radiation but it is still there. Thats whats happening with 808nm. When I am focusing without safetyware on I have a flat black background to absorb and IR that might reflect back onto my eyes.

When the laser burns it creates a white hot point of intense visible light you are also seeing that in the video.

regards
sbdwag
So, you're saying that even though you can't see it, the dot will still hurt your eyes if you lets say, shine it on a wall due to it's high output? I know obviously not to stare directly into the beam, but if I picked up right on what your reply was, I just learned something new!
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Old 08-16-2009, 02:22 AM #20
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Default Re: VIDEO 1W Labby burning some thinks

Yes the reflections off the laser are just as dangerous as any visible light laser. If you get a reflections off of glass you could recieve as much as ten percent of the lasers output. Thats 100mw's! There are a few people here who will tell you that there is noting to worry about because IR laser radiation is less potent than visible light lasers. But personally I dont believe it and its my eyes not theirs.

I find that it is very easy to get lazy with IR lasers because they look harmless. Perhaps this is the most dangerous aspect of them. Because you cannot see the light you assume its not there. If any thing I am more cautious with them than the 250mw blu-ray I have. I zapped myself with a reflection off of glass the other day with it killing bugs on the window (real smart move) and Although it appears I suffered no long term effects It scared the hell out of me. Its like getting hit with a lightning bolt.

I do not want the same thing to happen with this laser. Making a lab type instruments was a deliberate precaution. I can have the same enviroment and Understand my surroundings for hazards everytime I use it.

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Last edited by sbdwag; 08-29-2009 at 01:45 PM.
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Old 09-29-2009, 01:19 PM #21
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Default Re: VIDEO 1W Labby burning some thinks

Hi All,

First post, so please be gentle....

Nice build, sbdwag.

I thought that IR would have trouble going through glass, as seen on one of the "Mythbusters" shows. Does an AR coating help with transmission ?

regards

David
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Old 09-29-2009, 01:59 PM #22
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Default Re: VIDEO 1W Labby burning some thinks

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Hi All,

First post, so please be gentle....

Nice build, sbdwag.

I thought that IR would have trouble going through glass, as seen on one of the "Mythbusters" shows. Does an AR coating help with transmission ?

regards

David

Depends completely on the wavelength of the IR, if it's deep IR like 10,600nm from a CO2 laser then that will be absorbed by glass and cause it to melt. If it's only at 808nm then it will pass through glass just fine.
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Old 09-29-2009, 08:55 PM #23
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Default Re: VIDEO 1W Labby burning some thinks

Hi Diachi,

Thanks for the info.

When in the car, the sunlight through the window glass is not as hot on the skin as it is when the window is open / down.
Seeing as fabric colours can be affected by UV, and they are often faded when exposed to the sun, even through double glazed windows, I thought that the glass was reducing the IR's progress.

regards

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