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 Forum index » Discussion » Schmooze
Nevermind the plasma scalpel, look into my flashlight!!
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v-un-v
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PostPosted: Fri May 09, 2008 7:53 am    Post subject: Nevermind the plasma scalpel, look into my flashlight!!
Subject description: - and feel the burn!!!!!
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Well, I was quite impressed with the plasma scalpel, until I saw,


this


Cool (quite literally!!)


Twisted Evil Twisted Evil Twisted Evil Twisted Evil
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PostPosted: Fri May 09, 2008 8:29 am    Post subject: Reply with quote  Mark this post and the followings unread

I checked the Digi-Key catalog, they sell a 120mW laser diode at 784 nm for $24.76, part number 425-1809-ND. That might be powerful enough to do the trick. It has the leads on it already and no disassembly required. They sell the housings too. I wonder how powerful the video's diode is.

I used to play around with laser pointers, bought a batch of 100 of them once from Ebay. They were <5mW, so the above diode is at least 24 times more powerful than a laser pointer. The trouble with the pointers is that they don't all point in the same direction, so they are difficult to combine into a stronger beam.

Next thing to do is gang a bunch of the powerful lasers up in a radial array with a central lens or two to combine the beams into a concentrated multi-beam. That would make a nice ray gun - until you got arrested that is!

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v-un-v
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PostPosted: Fri May 09, 2008 8:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Well I was actually thinking of laser light shows Cool

The main problem with the low wattage models is getting the beam to travel enough.

Now where's that oscillographics circuit? Wink
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PostPosted: Fri May 09, 2008 9:03 am    Post subject: Re: Nevermind the plasma scalpel, look into my flashlight!!
Subject description: - and feel the burn!!!!!
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v-un-v wrote:

Cool (quite literally!!)


Twisted Evil Twisted Evil Twisted Evil Twisted Evil


nasty, nasty, nasty Twisted Evil

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PostPosted: Fri May 09, 2008 9:09 am    Post subject: Reply with quote  Mark this post and the followings unread

v-un-v wrote:
Now where's that oscillographics circuit? Wink


Perhaps you are familiar with the technique of securing a small mirror on a speaker to trace a line? Use two speakers for an X-Y display, and obviously just ramp the horizontal for a laser oscilloscope. Doesn't work with tweeters, not enough travel - works with midrange speakers and woofers.

Also what I did was buy an old Virtual Boy game from Ebay and take it apart. Inside is a pair of 30 Hz resonant mirrors to do the trick. I made lissajous patterns across the room that way when I was playing around with laser pointers. Was fun to do. Cool

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v-un-v
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PostPosted: Fri May 09, 2008 9:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Inventor wrote:

Perhaps you are familiar with the technique of securing a small mirror on a speaker to trace a line? Use two speakers for an X-Y display, and obviously just ramp the horizontal for a laser oscilloscope. Doesn't work with tweeters, not enough travel - works with midrange speakers and woofers.


Yes very cool indeed!

Also shining though glue also looks really cool- and you need a really powerful laser for that too! Just put the glue onto glass, twirl it around a bit, let it dry, and hey presto!
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PostPosted: Fri May 09, 2008 2:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ah, a use for my drawer of old glue!

Man, now you got me thinking about multi-laser ray guns again, I can't get it out of my head! Good thing I don't have the bucks to buy a couple dozen of those 120 mW laser diodes or I'd make one for sure!

One way to do it would be to house each one in a lens assembly and then point them all into a "death star lens" as described recently in another thread. That would be cool but impractical as the lens is heavy. One could substitute any telescopic lens arrangement in place of the death star lens though.

But to really do it right, you would not want to focus each diode with its own lens, but rather make some lens assembly that takes the point sources and concentrates them into a narrow beam. Unfortunately (or perhaps fortunately) I still cannot visualize how that lens system would work.

Oh, and for anyone foolish enough to actually attempt such a project, please be aware of the dangers and possible legal issues involved. High power lasers are not toys, as you know.

Dang, now I've got lasers on the brain again...

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parabola



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PostPosted: Thu May 15, 2008 2:50 am    Post subject: Reply with quote  Mark this post and the followings unread

My friend once set up a load of simple laser pointers on a reflective satellite dish (an old sky one, I recall), all calibrated and held into place around the edge and....

It just made a really thick laser beam. The coolest thing was that, at night, you could see it very far away!

Unfortunately, these laser pointers weren't powerful enough to become a face melting ultra-destructo device. Cool though.

Any thoughts on what some really powerful lasers could be capable of??

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