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Old 01-04-2017, 02:13 AM #1
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Default Laser in mirror burned it's own diode out?

So I was playing with my great little 300mw red laser off ebay. Of course then I had to point it in a mirror and try to align the beams. The moment I did the diode went down to a faint glow.

Did I kill it?


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Old 01-04-2017, 02:23 AM #2
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Default Re: Laser in mirror burned it's own diode out?

Quote:
Originally Posted by Infarouge View Post
So I was playing with my great little 300mw red laser off ebay. Of course then I had to point it in a mirror and try to align the beams. The moment I did the diode went down to a faint glow.

Did I kill it?
I've actually heard on the forums of people killing their lasers this way and it seems to be more common that I would've thought. Are your batteries fully charged? If so then you probably have an LED'd laser diode.
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Old 01-04-2017, 02:29 AM #3
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Default Re: Laser in mirror burned it's own diode out?

I'd say so. It probably got too hot.
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Old 01-04-2017, 02:36 AM #4
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Default Re: Laser in mirror burned it's own diode out?

Yep battery is good tried 2nd. So it actually lasers again in a mirror amplifying itself into near instant overload being the radiation can't escape.
Good thing I didn't make a black hole.
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Old 01-04-2017, 02:51 AM #5
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Default Re: Laser in mirror burned it's own diode out?

Quote:
Originally Posted by Infarouge View Post
Good thing I didn't make a black hole.
Yea. That would've sucked for all of us. Pun intended
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Old 01-04-2017, 02:52 AM #6
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Default Re: Laser in mirror burned it's own diode out?

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Originally Posted by ElectricPlasma View Post
Yea. That would've sucked for all of us. Pun intended
Black holes are a very serious thing! I don't think you understand the gravity of the situation
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Old 01-04-2017, 02:54 AM #7
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Default Re: Laser in mirror burned it's own diode out?

Quote:
Originally Posted by Lildutchboy7 View Post
Black holes are a very serious thing! I don't think you understand the gravity of the situation
You bet. I would ask you to enlighten me but that would defy the laws of a black hole.
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Old 01-04-2017, 04:20 AM #8
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Default Re: Laser in mirror burned it's own diode out?

Joking aside it raises a question I though about. Why can't even weak 5mw lasers be focused into a small enough spot to burn things?
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Old 01-04-2017, 05:09 AM #9
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Default Re: Laser in mirror burned it's own diode out?

It's catastrophic optical damage (COD). It is dead.
This is why you need anti-reflective-coated lenses for high power, and it's always a good idea to point the laser at a slight angle when going through additional lenses, windows, or other optics.
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Old 01-04-2017, 06:02 AM #10
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Default Re: Laser in mirror burned it's own diode out?

Quote:
Originally Posted by Infarouge View Post
Joking aside it raises a question I though about. Why can't even weak 5mw lasers be focused into a small enough spot to burn things?
There's a limit to how small a beam at a given wavelength can be focused. It's called the diffraction limit.

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Originally Posted by FireMyLaser View Post
It's catastrophic optical damage (COD). It is dead.
This is why you need anti-reflective-coated lenses for high power, and it's always a good idea to point the laser at a slight angle when going through additional lenses, windows, or other optics.
This^^
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Old 01-04-2017, 06:21 AM #11
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Default Re: Laser in mirror burned it's own diode out?

Another!
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Old 01-04-2017, 06:38 AM #12
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Default Re: Laser in mirror burned it's own diode out?

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Old 01-04-2017, 06:45 AM #13
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Default Re: Laser in mirror burned it's own diode out?

Why would you shoot the output of a laser beam directly back into the diode using a mirror? I have had diodes fail just from using of of those small little line producing lenses, due to having too much reflect back into the diode, much less a mirror putting most of the power back into the diode.
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Old 01-05-2017, 12:48 AM #14
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Default Re: Laser in mirror burned it's own diode out?

Quote:
Originally Posted by FireMyLaser View Post
[cod] is why you need anti-reflective-coated lenses for high power
No. AR coating just improves efficiency. The reflection pattern from a lens does not re-focus on the output facet, it diverges.
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Old 01-05-2017, 07:16 AM #15
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Default Re: Laser in mirror burned it's own diode out?

Maybe not re-focus but will return power back into the diode and if over-driven to begin with, as we like to do for our pointer laser diodes, is bad news to add more heat back into the diode.
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Old 01-05-2017, 10:54 AM #16
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Default Re: Laser in mirror burned it's own diode out?

Quote:
Originally Posted by ElectricPlasma View Post
Yea. That would've sucked for all of us. Pun intended
If the black hole was significantly smaller than lets say proton - what is likely when considerling general laser power, it would just fall through the Earth to the core and stayed there as it could not swallow probably anything. Anyway with this size it would just evaporate very quickly due to to Hawking's radiation before anything could fall into it, probably even faster that its fall inside the Earth's core The size of black hole of mass (or energy - remember E=mc^2 where c is just constant) of Earth would be of diameter about 18 mm. So, consider energy of the laser...

So, no worries when playing with lasers and mirrors that you will not destroy Earth.

Just saying.
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