Old 07-03-2016, 08:20 AM #1
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Default Probably unecessary reminder

Most of you folks are probably aware of this already, but for those that aren't, just because your laser isn't emitting visible light doesn't mean that it ain't emitting something.

The only reason i knew this is having read misc. threads and perhaps followed a few links here, where I learned that even though your laser may seem dead it could be emitting IR. So, many thanks to the name forgotten LPF user that lead me to this useful info,

I am going to attempt to attach a picture of my broken 405nm emitting what appears to be UV, and most likely IR too. It's the best picture I could get hiding behind my laptop while trying to hold the unit steady I don't think it's due to low battery, a I have swapped out 4 different fully charged cells with the same result. No visible light is emitted even a couple of inches in front of lens, only visible using camera.

Lesson being, just cause it ain't shinning, don't go staring at the lens while pushing the on button. What ever is being emitted is likely not good for you.
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Old 07-03-2016, 08:39 AM #2
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Default Re: Probably unecessary reminder

Quote:
Originally Posted by yawnny View Post
Most of you folks are probably aware of this already, but for those that aren't, just because your laser isn't emitting visible light doesn't mean that it ain't emitting something.

The only reason i knew this is having read misc. threads and perhaps followed a few links here, where I learned that even though your laser may seem dead it could be emitting IR. So, many thanks to the name forgotten LPF user that lead me to this useful info,

I am going to attempt to attach a picture of my broken 405nm emitting what appears to be UV, and most likely IR too. It's the best picture I could get hiding behind my laptop while trying to hold the unit steady I don't think it's due to low battery, a I have swapped out 4 different fully charged cells with the same result. No visible light is emitted even a couple of inches in front of lens, only visible using camera.

Lesson being, just cause it ain't shinning, don't go staring at the lens while pushing the on button. What ever is being emitted is likely not good for you.
Good reminder. However, 405nm lasers don't emit either UV or IR

-Alex
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Old 07-03-2016, 09:02 AM #3
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Default Re: Probably unecessary reminder

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Originally Posted by Hap View Post
Good reminder. However, 405nm lasers don't emit either UV or IR

-Alex
I can't argue with you, since I don't know. But, I do know that it would not make a dot on the the back of my hand at maybe two inches, in a dark room, but my phones camera picked it up. For all I know it was always making a really low low power dot, but I sure as heck wasn't going to look at it without a camera running interference

So, only green and red lasers emit IR along with their respective wavelength of visible light? Thanks for the input.
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Old 07-03-2016, 09:08 AM #4
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Default Re: Probably unecessary reminder

Quote:
Originally Posted by yawnny View Post
I can't argue with you, since I don't know. But, I do know that it would not make a dot on the the back of my hand at maybe two inches, in a dark room, but my phones camera picked it up. For all I know it was always making a really low low power dot, but I sure as heck wasn't going to look at it without a camera running interference

So, only green and red lasers emit IR along with their respective wavelength of visible light? Thanks for the input.
What you were seeing was 405nm, a very dim purple color. Impossible it could be UV since 405nm diodes don't operate into the UV range. The only lasers which emit IR are IR lasers(of course) and DPSS lasers which use IR to convert into the wavelength they want.

And yes, don't look into the aperture

-Alex
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Old 07-03-2016, 09:25 AM #5
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Default Re: Probably unecessary reminder

Quote:
Originally Posted by Hap View Post
What you were seeing was 405nm, a very dim purple color. Impossible it could be UV since 405nm diodes don't operate into the UV range. The only lasers which emit IR are IR lasers(of course) and DPSS lasers which use IR to convert into the wavelength they want.

And yes, don't look into the aperture

-Alex
Interesting. I was under the erroneous impression that all diode type lasers created IR as a byproduct of of their magical creation of the proper wave frequency. I appreciate the correction.

The reason I ASSumed that the unit was up to no good, is that it started out working perfectly fine, with a nice proper dot, and quickly failed.

Oh well, as you said, still good advice not to look at the aperture, even if it looks off.
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Old 07-03-2016, 10:54 AM #6
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Default Re: Probably unecessary reminder

Quote:
Originally Posted by yawnny View Post

Oh well, as you said, still good advice not to look at the aperture, even if it looks off.
Yes, that's the real lesson here!
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Old 07-04-2016, 09:26 AM #7
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Default Re: Probably unecessary reminder

Yes, just like you won't look down the barrel of a loaded gun. Or would you?

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Old 07-04-2016, 03:29 PM #8
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Default Re: Probably unecessary reminder

Quote:
Originally Posted by CurtisOliver View Post
Yes, just like you won't look down the barrel of a gun. Or would you?
Actually, it's perfectly fine to look down the barrel of a gun once you've confirmed first that all ammunition has been removed and that the chamber is empty/there are no rounds stuck in the feed path. It's one way to check for debris/obstructions in the barrel and it's often easier to look from the muzzle end than it is from the chamber end.

PROVE
Point the firearm in the safest available direction.
Remove all ammunition.
Observe the chamber.
Verify the feeding path.
Examine the bore.
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Old 07-04-2016, 03:36 PM #9
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Default Re: Probably unecessary reminder

I did not know about the prove acronym. Then again, why would I. I have no need for a gun, I have my lasers
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Old 07-04-2016, 04:37 PM #10
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Default Re: Probably unecessary reminder

Your camera is more sensitive to 405nm light than your eyes. Anyone who has taken pictures of 405 can attest that only some cameras are able to show laser color properly, especially when it comes to ones at the edge of the visible spectrum.

DPSS lasers are lasers that contain IR as it is usually the wavelength of the pump diode(the laser light that is converted into the preferred wavelength). After passing through crystals, there is usually residual IR that leaks through and remains unconverted (very broad explanation, A LOT to read on the subject). This is why IR filters are suggested in DPSS builds.
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Old 07-04-2016, 04:43 PM #11
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Default Re: Probably unecessary reminder

Quote:
Your camera is more sensitive to 405nm light than your eyes. Anyone who has taken pictures of 405 can attest that only some cameras are able to show laser color properly, especially when it comes to ones at the edge of the visible spectrum.
Camera sensitivity has most probably got a lot to do with detected dim purple light. Just a damaged diode.
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Optlasers RGB Modules

Optotronics offers some of the highest output DPSS Portable Greens on the market. Their 1.4W RPL-II is by far their most amazing product and is known to be overspec.
Optotronics RPL 532nm DPSS Portables

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
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Sanwu are known to be very high quality and every newcomer should check them out.
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Bang good is a good source for many electrical items and are often cheap and reliable.
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For reliable safety goggles visit Survival Laser. Use LPF445 for a 10% member discount.
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For more sites and information please check out this thread.
Which company should I buy from? By Sta






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