Home made nitrogen laser
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Uploader Comments (c4r0hv)
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Actually, this *is* a laser -- it's what's called "superradiant". A laser is defined by the stimulated emission, coherence, and sharply constrained emission wavelength(s), not by the resonant cavity -- but most laser systems require a resonant cavity in order to obtain enough amplification (by multiple beam passes through the medium) to produce a useful beam. A nitrogen laser (including those that use air) can have enough gain to make a good beam (albeit with high divergence) in a single pass.
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Sounds like a chain saw!
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@c4r0hv Yeah, the rails weren't properly contacting the capacitor plates.
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That's good that you see the purple glow (if it's really THE purple glow). Blue sparks should not be a problem as long as the glow is there. from my experience aligning the rails is not that hard, but acording to general opinion it's the hardest part of getting this kind of laser to work. So I suggest to not give up and try aligning it over and over :P What is the shape (cross section) of your rails? The discharge should occur in absolutely straight line.
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@c4r0hv Ok, I change the dielectric to overhead transparency, and now I see a purple glow between the rails when it fires, but there are still lots of bright blue sparks. It isn't lazing either. All I can see is the reflection of the rails from the bright blue sparks. Do you think I should replace the rails?
PS I never actually saw the laser start working; all I saw was the purple glow before it died.
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But unfortunately, the laser spot is pretty lame looking. I'll make a video soon. For some reason, it doesn't work when it's humid out. It's still pretty cool though.
toadsEATbugs 1 year ago
@toadsEATbugs
Well, what did you expect it to be? IMO we should be lucky to get any spot at all. To get a good quality beam you absolutely need a good wuality optical resonator, and here you don't have any resonator at all.
c4r0hv 1 year ago
I got it working! Yay!
toadsEATbugs 1 year ago
@toadsEATbugs
Congrats! Did you figure out what exactly was wrong?
c4r0hv 1 year ago