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DoctorOfSpace
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05 Feb 2018 13:28

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Watsisname
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05 Feb 2018 18:05

 ^Good video.  First for awareness of mislabeled products, second because I love that method of calculating laser wavelength. :)  It is very precise, typically limited most by uncertainty in the spacing of the diffraction grating.  Or slit width if you happen to use the single/double slit method.

One other thing to be aware of about different wavelength and power lasers is that the relationship between apparent brightness of the beam/dot and its true intensity is very deceptive.  Eye sensitivity to light varies by wavelength: peaking at ~550nm (green) and dropping quickly in the red and violet.  My 120mW violet laser looks about as bright as a typical <5mW green laser, but will quickly sting bare skin.  Definitely not eye safe.
 
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DoctorOfSpace
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05 Feb 2018 23:22

Have been tempted to buy a powerful laser, but I have no use for one outside of curiosity.  I have guns laying around and I feel fine with that, but a high power laser just seems like more of an immediate hazard.
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Watsisname
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06 Feb 2018 00:49

There are interesting experiments in optics that can be done with lasers (my avatar image being an example), but besides that and pointing at things they're mostly curiosity.

Power levels above 100mW get pretty sketchy.  Too many people treat them like toys or shine them at things they shouldn't.  Treating a high power laser the same way as a firearm is a mindset I encourage in anyone who wishes to use mine.  In particular, a firearm that reflects.  At those power levels a momentary lack of awareness can lead to injury.  

High power green is nice for visibility.  I also like the 405nm violet wavelength as it is short enough to induce a variety of fluorescence. :)
 
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midtskogen
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06 Feb 2018 21:29

Over here there is a ban on lasers above 1 mW.  You must have a permit to own one, and to get the permit you need a reason (beyond using it as a toy).  The reason for the ban was that too many people did use it as a toy (pointing at airplanes, etc).
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DoctorOfSpace
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06 Feb 2018 21:34

midtskogen wrote:
Source of the post (pointing at airplanes, etc)

That is a felony in the states, as it should be.
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Watsisname
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15 Feb 2018 19:07

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