laser diode

Discussion in 'The Projects Forum' started by tripplegravity, Jun 1, 2008.

  1. tripplegravity

    Thread Starter New Member

    Jun 1, 2008
    hi everyone
    i have a laser diode that has been taken out from a cd rom (32x) i want to use it to make a pointer and have no idea ho to even get started
    i have connected 3 wires to the terminals of the laser diode even after giving a 12 volts supply i does not seem to light up
    please some one help me soon
  2. hgmjr


    Jan 28, 2005
    You inadvertantly placed your post in the "Project Collection Forum". As a result of this, your post required moderating. I have moved your post to the "Projects Forum" and approved it.

    The post is now visible to all members.

    hgmjr (moderator)
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    The diode is probably emitting in the near IR, which makes it invisible. You can use a digital camera to see if it is emitting. The CCD imager is sensitive to near IR.

    You might also have fried the device by not limiting current through it. Here is the relevant article from out Ebook -
  4. SgtWookie


    Jul 17, 2007
    Most CD/DVD player lasers will emit light outside of the visible spectrum, as has already been mentioned. This in itself makes them unsuitable for laser pointers.

    Power supplies for lasers have to be very accurate in order to avoid subjecting the laser diode to even momentary excess current. If too much current passes through the laser diode, even for an instant, it will be destroyed. To properly set the current through the diode generally requires (at a minimum) documentation on the diode.

    What has not been mentioned as of yet is the danger associated with these diodes, particularly in recordable-type CD/DVD drives. If you don't know what you're doing, you can become blinded or otherwise maimed within moments.

    Even commercially available low-powered laser pointers output more than enough light to cause blindness if used in a careless manner; for that matter so can the newer "super bright" LED's.

    You only get one set of eyes per lifetime. Protect them.
  5. HarveyH42

    Active Member

    Jul 22, 2007
    12 volts, through a 2-4 volt, sensitive device... Guessing you will have a lot of trouble getting any use out of it, now... Should have googled 'laser diode hookup' first. There is one very good page, 'Sam's (something..)' which would have saved the part (maybe, no specs, and easy to fry...).
  6. Wendy


    Mar 24, 2008
    I suspect the blue ray lasers are going to be very popular for their color. We might get ready for the inevitable queries about them.