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Thread: Extremelasers BLM75

  1. #1
    Join Date
    Jan 2008
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    Napa, Ca
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    Default Extremelasers BLM75

    I purchased this http://www.extremelasers.com/BLM.htm laser a little over a year ago with no intentions of using it with a laser scanner. A year later and I am now trying to build an RGB projector. On the website under output mode it says CW analog or modulation and then it has (TTL) on the side. I am pretty sure my laser is TTL and not analog modulation, but is there anybody here who can confirm that?
    Last edited by yobresal; 02-04-2008 at 17:42. Reason: Forgot a link

  2. #2
    Join Date
    Jan 2007
    Location
    Cupertino, California
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    2,130

    Default

    It is TTL......
    CLICKY!!!

    Admin: In the immortal words of Captain Planet: YOU HAVE THE POWER
    Admin: (To quit being a bitch)

  3. #3
    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    7,067

    Lightbulb

    TTL, Jure lie to charge 10% of his retail price to add analoge to a laser he has sold.
    Love, peace, and grease,

    allthat... aka: aaron@pangolin

  4. #4
    Join Date
    Jan 2008
    Location
    Napa, Ca
    Posts
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    Default

    Well that is a huge bummer. Looks like I know what I'll be spending my tax refund on this year. It's still a cool laser though, the color is beautiful and I measured it to 78mW. Is there a way to change it from TTL?

  5. #5
    Join Date
    Oct 2006
    Location
    Central Florida
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    7,067

    Lightbulb

    Rumor has it there is a way, but from what I hear it would be as much hassel as saving up the cash for a analog one. It has been asked here and shot down. I think I asked and marconi shot it down.

  6. #6
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,489,073

    Cool

    Marconi is right. It's not just a matter of varying the current drive to the pump diode (while preventing an over-current condition). Analog blanking on a DPSS laser also requires very accurate control of the two TEC's in the head. Usually you end up with a feed-forward controller tied to the blanking input and a feedback controller tied to the thermal sensor on the TEC. Balancing those two controllers is a bitch, and you have to do it for BOTH TECs. Then too, the response curves are different for the two! If you get it wrong, you get severe jellybeaning. If you get it *really* wrong, you can ruin the crystals. Most people decide that it's not worth the trouble.

    Adam

  7. #7
    Join Date
    May 2007
    Location
    Milwaukee WI
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    1,355

    Default

    Quote Originally Posted by yobresal View Post
    Well that is a huge bummer. Looks like I know what I'll be spending my tax refund on this year. It's still a cool laser though, the color is beautiful and I measured it to 78mW. Is there a way to change it from TTL?


    As if you weren't going to spend the refund on lasers (or laser related gear) in the first place...

  8. #8
    Join Date
    Jan 2008
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    Napa, Ca
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    Default

    Ha!, you are right. That is where all of my extra money usually ends up.

  9. #9
    Join Date
    May 2007
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    Milwaukee WI
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    Default

    Extra money?!?! I think I might stop eating just so I can buy more lasers... its like a drug now - soon there will be anti-laser commercials, and Photon Patches and gum

    'c'mon everyone is doing it'

    Where did that Laser Enthusiast Anonymous thread go? ... 'My name is Max and I'm a Laserholic'

    Laser Enthusiast Anonymous - sounds like a good name for a new LEM maybe for the Midwest... hmmm

  10. #10
    Join Date
    Jan 2007
    Location
    Yorkshire, UK
    Posts
    4,585

    Default

    Hey, I just 'got' your username....

    yobresal = 'laserboy' in reverse

    Sorry, i'm a bit slow this morning

    Jem
    Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.... Douglas Adams 1952 - 2001

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