Fast Response LASER

Discussion in 'The Projects Forum' started by rueffy, Oct 16, 2013.

  1. rueffy

    Thread Starter Member

    Jun 29, 2013
    39
    3
    Hi,

    Anyone know of a LASER pointer or similar device that is capable of turning on and off at a rate of 10kHz plus. The LASER beam will be subject to PWM for the purposes of audio transmission through free space.

    Turns out e-bay LASER's aren't up to the task.

    Rueffy.
     
  2. richard.cs

    Member

    Mar 3, 2012
    162
    31
    I don't know of any diode lasers part numbers although I'm sure lasers that do what you want exist - have you tried buying them from places that publish accurate datasheets? I'd expect that information to be included.

    Were you using just a laser diode or an ebay laser module that included a bunch of drive electronics? You really want to drive the diode directly.

    Don't dismiss the option of running the laser CW and modulating with an LCD, moving mirror, etc
     
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  3. Sensacell

    Well-Known Member

    Jun 19, 2012
    1,130
    267
    I believe the lasers themselves are fast enough, it's the DRIVER circuits that are slow.
    Maybe you could replace the driver circuit.
     
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  4. Shagas

    Active Member

    May 13, 2013
    802
    74
    To OP:

    What you are looking for is a laser with TTL input.
    The driver you have has only two wires . You need one with three.
    A third yellow wire to which you will feed your pwm .
    Try searching ebay for something like : Laser module with TTL , or Laser TTL
    Or constant current driver with TTL , there are plenty available...

    If you want a laser pointer to do this then you will have to install the driver yourself .
    I doubt you will find (i'm sure you won't) a laser pointer with TTL , but a whole module(driver+laserdiode+ optics) you can find plenty. Then you can pick out a cylindrical housing for the module and your 10khz circuitry+switch+battery.
     
    Last edited: Oct 16, 2013
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  5. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Ebay laser modules are VERY cheap and come as just the laser diode and focuser lens/brass housing, and two wires.

    You can modulate them just like a LED, at 10kHz or 100kHz no problem.
     
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  6. IC-Man

    New Member

    Jan 3, 2012
    26
    4
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  7. rueffy

    Thread Starter Member

    Jun 29, 2013
    39
    3
    Sorry I never got back to you guys on this thread, a LASER dot diode module was the way to go, I tried a LASER diode but it came with the collimating lens separate, a real pain to try and position correctly, the dot module was all ready to go, just needed to design a driver circuit around it.

    Thank you to all those that helped contribute to the development of my circuit. The project is now fully functional and I've made a video as part of my presentation to a class, the video shows the system in operation with a full description of signal flow etc.

    http://www.youtube.com/watch?v=CCAkpJ-jG6A

    rueffy.
     
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