Laser envy

The_LED_Museum

*Retired*
Joined
Aug 12, 2000
Messages
19,414
Location
Federal Way WA. USA
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by lambda:
Awful wide beam for a LASER>?<HR></BLOCKQUOTE>

The photos show it with a scanner head affixed to or located near its aperture. The beam of a laser of that type will be well under 1mrad without the scanner head activated or attached.
 

LED-FX

Enlightened
Joined
Jul 23, 2001
Messages
630
Location
Edinburgh UK
The,er, scan head is simply a couple of DC motors that will give you lissajous patterns.
Don`t think the circuit board they`re hot glued to has much to do with em......

The laser head itself is at 488nm blue which wont appear as bright as a 532nm greenie,in fact it`ll be about 3 to 5 times dimmer to the human eye.BUT 25mw will do some damage if you stare into beam.You`d get almost as apparently bright with a 5mw green pointer,with less risk and hassles.

Other thing is air cooled head should have a f***ing huge ,I mean, very big fan on it to keep it cool,if that ain`t there its a short lived tube.

I`m no laser expert, just a hobbyist who has been financially burn`t in the past.Excellent info on lasers:

L.Michael Robert`s: http://www.laserfx.com/

Sam Goldwasser`s: http://www.repairfaq.org/sam/lasersam.htm

Adam
 

Chris M.

Flashlight Enthusiast
Joined
Jan 17, 2001
Messages
2,564
Location
South Wales, UK
The,er, scan head is simply a couple of DC motors that will give you lissajous patterns.
Don`t think the circuit board they`re hot glued to has much to do with em.


That motor/board assembly looks to me like it came from one of those cheap battery powered "laser crab" light show effect thingys. I`ve got one here- same setup and a red 660nm <5mw diode laser fitted to it. I can see some holes on that board pictured there which look like the mounting holes for the original red laser module.
The circuitry has manually adjustable speed controllers for the motors and a little programmed chip that can cycle through 16 preset patterns (just different speed/direction settings).

If/when I get me a green DPSS laser of my very own, I`ll be dismantling my laser effect and sticking the greenie in there instead. Should make some amazing effects in the sky on a foggy night. The red is just too dim to show up normally.


shocked.gif
tongue.gif
 

LED-FX

Enlightened
Joined
Jul 23, 2001
Messages
630
Location
Edinburgh UK
Missed out the other great source of info for Laser fans, usenet alt.lasers,both LMR and Sam Goldwasser are regulars there,if you dont have a news feed from your ISP try Google Groups:
http://makeashorterlink.com/?G2315547

anyway couple of recent posts of special interest to us UK laser starved experimenters:
from

Mike Harrison of http://www.electricstuff.co.uk/ on imnporting green pointers to the UK:

"There should be no problem as long as it has the correct labelling and
complies with the appropriate standards. The only thing that they can
sieze is a laser marked as one class which produces more power than
permitted by the classification labelling. They're more likely to be
interested if it's not CE marked. If you can, get the supplier to list
the contents as components, as these are exempt from many of the
restrictions."

and from Steve:

"As far as I know pointer modules are made by www.cnilaser.com
last time I looked a 5mW pointer could be bought from them for $164 dollars
US.These go into the pointers sold by Deharpporte Trading and others.
Someone can corect me if I'm wrong but these modules appear to be of better
contruction than the ones sold/made by Ming Micro Systems www.ming-micro.com
So if you have problems now you can go to the sources"

Adam
 

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