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Homemade lasershow for school

J

jonashn

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Hey LPF'ers ;)

I'm one of the guys in charge of lighting and sound in a show my class is gonna do the 29. of this month.

We've agreed to use "also sprach zarathustra" as the intro sound. While the beginning of that was playing, i'm thinking about doing the following: two lasers on the floor of the relative large stage are pointing up in the air, making an opposite v shape, or maybe an x shape. Each beam hits a mirror on a speaker before it "airs". So when i play the piece through those speakers, the beams will move in a kinda cool way.

The stage will be filled with fog (we have a fog machine, will a hazer be neccesary?), and the audience will therefore be able to see the beam.

Do you think this is possible? Will it be safe for the audience (they won't see the dot. )?

I'm thinking of buying one of dealextreme.com's 70 or 100mW laser modules, is that overkill?
 





M

motorider826

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umm, the erratic movement of the beam after hitting the speaker mirror sounds really dangerous actually. unless you can guarantee, 100% no doubt, no matter what that the beam will not land any where in or near the audience or anyone for that matter, then you are running a large risk.
 
J

jonashn

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I can do that by putting a shield up in front of the laser system that will shield the beam from hitting the audience. Another thing is reflections from the roof where the laser hits all the time - it'll have to be placed in a way which dissallows that.
 
diachi

diachi

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jonashn said:
I can do that by putting a shield up in front of the laser system that will shield the beam from hitting the audience. Another thing is reflections from the roof where the laser hits all the time - it'll have to be placed in a way which dissallows that.
Click to expand...


You would be much better using green modules for this show ( DX 35mW green would be good especially if you run it at 6V-6.5V, you get a higher output), the beam is MUCH brighter than red.

Also, what is the roof like, is it just polystyrene tiles ? How high is it from the audience ? As long as you can guarantee 100% that the actual beam cannot hit the audience then it's fine. If the dot goes on the roof ( as long as the roof isn't reflective ) then that is also fine.

If you are going to be bouncing the beams off of mirrors you'll need to use first surface mirrors. normal rear reflection mirrors will reflect more than one beam and cause a loss of beam visibility.

-Adam
 
J

jonashn

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Diachi-> A laser like DX's sku 10004? In regard to the roof: it's filled with light equipment, but I will be able to ensure no reflections will occur.
 
J

jonashn

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- and thanks for the mirror tip! I'll look into who manufactures those and shop them to Denmark for the lowest prize.
 
diachi

diachi

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jonashn said:
Diachi-> A laser like DX's sku 10004? In regard to the roof: it's filled with light equipment, but I will be able to ensure no reflections will occur.
Click to expand...

Yeah thats the one.

If you cover up all the reflective parts of the lighting equipment or something with something no reflective, some black card or something, then that would work.

As for mirrors www.novalasers.com sells FS mirrors. Although you can google front surface mirrors and find other suppliers.

-Adam
 
J

jonashn

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Thanks for the link to novalsers, I have tried to get suppliers from google, but they were all very expensive. I'm also going to order an IR filter from them.

Do you know whether or not 35mW is totally overkill? One of my friends has a 5mW green from DX, and it's pretty bright also..
 
FokoF

FokoF

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The 35mw module from DX is great... really bright... with a little smoke it looks more like a 100mw :eek:
 
diachi

diachi

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FokoP said:
The 35mw module from DX is great... really bright... with a little smoke it looks more like a 100mw :eek:
Click to expand...


It wouldn't suprise me if it was 100mW ;) Mines is at least 60mW it cuts tape unfocused ( and it has a pretty wide beam ) not tried a match light yet though :p

BTW you don't really need an IR filter, get one if you want though.
 
FokoF

FokoF

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My beam is really narrow... bright, but i dont think it could cut tape :'(
 
diachi

diachi

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FokoP said:
My beam is really narrow... bright, but i dont think it could cut tape :'(
Click to expand...


Mines is narrow compared to a diode laser

It's narrow if I set it to focus 5-10 metres away, but if I want it to have a good divergence it's pretty darn wide. I was burning my boot with it last night when I was using it to terminate the beam :cool:
 
V

Vcent

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jonashn said:
Thanks for the link to novalsers, I have tried to get suppliers from google, but they were all very expensive. I'm also going to order an IR filter from them.

Do you know whether or not 35mW is totally overkill? One of my friends has a 5mW green from DX, and it's pretty bright also..
Click to expand...
Actually its a true 30mw ;)
 
diachi

diachi

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Vcent said:
[quote author=jonashn link=1225579121/0#7 date=1225725741]Thanks for the link to novalsers, I have tried to get suppliers from google, but they were all very expensive. I'm also going to order an IR filter from them.

Do you know whether or not 35mW is totally overkill? One of my friends has a 5mW green from DX, and it's pretty bright also..
Click to expand...
Actually its a true 30mw ;)[/quote]


whats a true 30 ?
 
diachi

diachi

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No it's the DX 35mW ... unless you mean the true 5mW should be 30mW ?

-Adam
 
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