Blacking Melles Griot

Discussion in 'QM2000 series of products' started by aricha, Jan 3, 2005.

  1. aricha

    aricha Well-Known Member

    Hi everybody

    I want to use Pangolin to blank the melles griot yag

    It is 58-GES-309

    I want to be able to turn the laser from a remote box
    -which is working for me-

    I couldn't blank the laser from the QM
    I tried pin 3 QM to pin 1 on the Exsternal interface connector of the Melles Griot and pin 16 QM to pin 8
    I also tried vice versa
    Any hints? should i use QM ground (pin 25) ?

    Thank you
  2. Pangolin

    Pangolin Staff Member

    Hi Aricha,

    You should ALWAYS use pin 25, as we strongly suggest in our help file and on our web site. I strongly suggest you connect pin QM2000 pin 16 to QM2000 pin 25, and then use QM2000 pins 3 and 25 to drive the laser. This will work, as long as you have not blown out your pin 3 output while doing your experiments.

    I know this works because we have others using this laser in the same way. Note that there are two inputs on the Melles Griot that may be used -- one for TTL blanking and one for Analog modulation. As far as I know, the one for analog modulation is preferred. You might contact Greg Makhov about this since I believe he knows these lasers pretty well.

    Best regards,

    William Benner
  3. frank.tan

    frank.tan New Member

    Hi Aricha,
    As Benner's reply,that's right,If can not work yet,you can use a resistance(1KOhm) connect Pin3 and Pin 25,Last year I have use 3 melles Griot 309 green lasers,but can not output laser ,use this method, it's OK, try it.
  4. aricha

    aricha Well-Known Member

    hi frank and thanks for your reply
    is it pin 3 & 25 or 16 & 25

    i shorted QM pin16 to QM pin 25
    i conected QM pin 25 to Exsternal interface connector pin 15 which is chassis ground
    it did not work
    i disconnected pin 25 from pin 15 - also did not work
    should i use pin 13? signal ground (which is being used for laser on)

  5. TylerLeDent

    TylerLeDent Member

    I have ran across a few of the older lasers that didn't have that feature in the power suppily FYI.