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  1. Q

    Popular Science Phaser Article...

    I know I'm bumping a near month-old thread, thought I would chime in having just discovered it via google. The one with the knobs & pots is mine, and none of it would be possible without the help and knowledge I've received from this board. Thanks a bunch you guys =D I made a full tutorial on...
  2. Q

    Safety of Diverged and Heavily Diffracted Audience Projections

    Wow, I was not expecting that level of complexity for determining safety of a laser display. As far as equipment for measuring... I have none of that. If I actually did have the gear, the math might indeed be fun =) I'm still on the fence about this laser-display going into my house. There are...
  3. Q

    Safety of Diverged and Heavily Diffracted Audience Projections

    I've spent many hours reading about laser safety, last night, I read the entirety of the International Laser Display Associations report on audience scanning here: http://dl.dropbox.com/u/1493830/audience-scanning_overview_latest.pdf and would recommend it to you, it was very thorough. I'm well...
  4. Q

    Safety of Diverged and Heavily Diffracted Audience Projections

    Wow, thanks for the rapid feedback, those two links are great. Yes, the first link is a legitimate horror story. The second one has listed in bold-yellow font that the show was performed safely, and user-held laser-pointers caused the damage. The point of the linked threads is to show how my...
  5. Q

    Safety of Diverged and Heavily Diffracted Audience Projections

    By horror stories, I'm not explicit speaking of events where the entire crowd is exposed, and you're right, where multi-Watt, pulsed lasers were used on the crowd. The two well-publicized events are at: Powerful lasers damage eyesight of some Russian ravers -- Engadget and Tomorrowland...
  6. Q

    Safety of Diverged and Heavily Diffracted Audience Projections

    Hi there, last night I went to a party, which had a cheap $30 red/green laser projector that displayed various patterns across and into our crowd last night. The projector was located in the corner of the room, and has a 50mW green and 100mW red that are heavily diffracted. There was no actual...
  7. Q

    Tutorial for a Four-Motor Compact Laser Spirograph

    @ goninanbl00d I used acrylic mirrors in my spirograph. Since I didn't feel like paying for front surface mirrors, I got a bag of 24 cheapy 1" acrylic mirrors and chemical treated the backs to expose the raw aluminum. One can of aircraft-stripper later, my projections have minimal scatter. Not...
  8. Q

    Tutorial for a Four-Motor Compact Laser Spirograph

    Hi there, though I don't post much here on laserpointerforums, I have browsed a lot and gained a ton of information from the numerous posts. I first came here with questions about a 5mW green laser over a year ago, and today I've decided to say thanks and post a guide to a tutorial I created on...
  9. Q

    75mW & Retroreflective Street Signs

    I know there are a large amount of projects that can be made with lasers, X/Y scanners, spirographs, light tunnels and the like, but what can I realistically do with a high powered laser pointer? I know you can light a match with 100mW+, pop balloons, cut electrical/duct tape, melt plastics, or...
  10. Q

    75mW & Retroreflective Street Signs

    Wow, thanks for the quick replies. I think I will purchase the xSeries 75mW Green then, just when I point it at a street sign I'll give it at least 75 meters distance for a there-and-back distance of 150m, making it 'safe enough'. Dr. Ebert is correct, the point of a retroreflector is the...
  11. Q

    75mW & Retroreflective Street Signs

    I've been playing with lasers for awhile now, though my highest power laser is 15mW. I'm interested in purchasing my first dangerously bright laser at 75mW from NovaLasers ( http://www.novalasers.com/NOVAstore/pc/viewPrd.asp?idcategory=3&idproduct=85 ). When showing my lasers to friends, even a...
  12. Q

    Power Requirements for a Laser Module

    I misunderstood what was needed to supply the correct power to my laser module. The original lasers were toasted at 3.08v for a 5mW Green module, so I figured it was something other than voltage (Turns out voltage was the only issue, just 3.08 was too high). I then was told I needed to create a...
  13. Q

    Power Requirements for a Laser Module

    Having changed my voltage regulator to 2.92 volts my spirograph is fully functional. I've been using it over the past two hours and the laser has not burnt out, and the rig seems to be relatively stable. However there is an oddity that is going on with brightness. After being left on for around...
  14. Q

    Power Requirements for a Laser Module

    So voltage is the primary factor? The driver board attached to the laser will regulate the current, and I just need to provide 2-3 volts. I do not want to power this laser via batteries, it is going to be plugged into the wall. It is part of a home-made spirograph, and the fans/mirrors and...
  15. Q

    Power Requirements for a Laser Module

    I am at a loss for words now. I have waited two weeks for some more 5mW Green laser modules, and they have finally arrived. I went to my local electronics store and purchased all of the parts required for a Daedel or DDL Driver, and built a full functional adjustable current limiter. My source...
  16. Q

    Power Requirements for a Laser Module

    I'm not using a lone green laser diode, its the entire module from the laser pointer with the driver board already attached. So from what I've read, a DDL driver controls current to the laser, and the voltage itself is not important as long as the proper amount of current (250mA for this <5mw...
  17. Q

    Power Requirements for a Laser Module

    Well I've got a <5mw Green laser-pointer module and don't know how to determine what current in mA it would use. It's one of these cheap laser pointers http://www.bestofferbuy.com/5mw-powerful-green-laser-pointer-pen-p-110.html. I would guess 250mA as I've seen that reading for other 5mW...
  18. Q

    Power Requirements for a Laser Module

    I guess I am using the wrong name for what I created, as it is the exact design you're talking about with a DDL driver. This is my own guide for how I create my regulator/DDL. Thanks for the quick response, I guess the voltage was just too high @ 3.08v. Will it add extra stress on the laser to...
  19. Q

    Power Requirements for a Laser Module

    Hello there, I have been obtaining my 5mW Green laser modules by extracting them from laser pointers. I then create my own voltage regulator using a LM317T which I can set to whatever voltages I need. As these lasers are powered by two AA batteries, making for a combined voltage of 3.0v. I then...
  20. Q

    Creating a Spirograph

    Which is better, a two-mirror or three-mirror spirograph? Does the three-mirror set have more possible shapes to project onto a surface? Do the mirrors inside of a spirograph have to be running in opposite directions of the one next to it? As in: Two Mirror Clockwise -> Counter-Clockwise...




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