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Thread: ML520G72 638nm 500mw Diode Group Buy

  1. #51
    Join Date
    May 2007
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    Austria/Vienna
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    308

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    Hello!
    I don´t understand the hype becouse of the 500mW Mitsubishi diodes.
    Still the 500mW CW Diode has a emitter of 40*1µm !
    This diode isn´t usuable for a lasershow use. The best beam you will get out with best optics will be arround 4*4mm @ 2,5mrad...
    Still this is a single emitter - multimode - broadband emitter Diode. To produce red on a highpower level with small emitters is a very difficult thing, it is not more possible what is avaiable at the moment !
    The Casio diode has a single emitter 1*14µm - 1*15µm... And still look which beam you get out ... the 500mW Nichia is 7*1µm and the Opnext/Mitsubishi diodes which we use are 2*1µm-3*2µm max.
    If you collimate it and run it you see beams side by side, this are Modehops ! As the DPSS lasers also the diodes arent perfect - they aren´t 100%ly linear and they have modehops!
    Greets,
    Phil

  2. #52
    Join Date
    Oct 2005
    Location
    Melbourne, Australia
    Posts
    678

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    for a 635nm 1/2watt diode, 40um is pretty good

    in comparison to the Chinese stuff that we're all used to. Figure 100-150um...

    I think you might slightly be overreacting.

    unless you're doing graphics from 300metres away, why do you need such a tight beam ? audience scanning with (whats likely to be multiples) of these 500mw (ie, many watts of blue, green and red)will need a high divergence in most venues to be safe.
    Now proudly stocking and offering the best deals on laser-wave

    www.lasershowparts.com
    http://stores.ebay.com.au/Lasershow-Parts

  3. #53
    Join Date
    Jul 2008
    Location
    north carolina usa
    Posts
    224

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    2 also if good
    thanks jeff

  4. #54
    Join Date
    Oct 2005
    Location
    Melbourne, Australia
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    678

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    Quote Originally Posted by mccarrot View Post
    hmmm, dreaming of a 2W RGB in the zise of the palm of your hand

    If the beamspecs are similar to the 445nm I'll take 4.
    2W ? you're not trying hard enough
    Now proudly stocking and offering the best deals on laser-wave

    www.lasershowparts.com
    http://stores.ebay.com.au/Lasershow-Parts

  5. #55
    Join Date
    Apr 2008
    Location
    Amsterdam, NL
    Posts
    2,098

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    Quote Originally Posted by aijii View Post
    2W ? you're not trying hard enough
    Problem is to find a small +1W 532nm.....
    500mW 532nm you can find pretty small.

  6. #56
    Join Date
    May 2008
    Location
    Portland, Oregon
    Posts
    130

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    First off thank you for finding this great deal and sharing it with all of us. If the beam can be tame enough for beam shows I think I would be interested in 8. Than my laser dreams can come true.

  7. #57
    Join Date
    Dec 2008
    Location
    veenwouden
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    2,580

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    I will send a package tommorow to Andy97 with a collimator, a collimatormount like this:
    Click image for larger version. 

Name:	collmount.jpg 
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    I also includes a prismpair to test the diode to shape the beam. Fingers crossed and hopefully that will work.

  8. #58
    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    7,067

    Thumbs up

    Quote Originally Posted by edison View Post
    I will send a package tommorow to Andy97 with a collimator, a collimatormount like this:
    Click image for larger version. 

Name:	collmount.jpg 
Views:	470 
Size:	2.9 KB 
ID:	18083


    I also includes a prismpair to test the diode to shape the beam. Fingers crossed and hopefully that will work.
    NICE!!!

  9. #59
    Join Date
    May 2007
    Location
    Romania
    Posts
    1,041

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    Hi Guys,

    Today after reading Phils post I decided to power one of the Diodes next to an LOC diode each with no optics, just raw output from both.

    Wish I had had my camera at hand to show the results.

    The beam profile ML520G72 is visually very similar to a 150mW 660nm LOC from sleds but of course a hell of a lot brighter.

    I am no scientist like Phil but I think from this quick power on visual test a simple collimation lens might be ok.

  10. #60
    Join Date
    Dec 2008
    Location
    veenwouden
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    2,580

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    Maybe before recieving my package a test next to a 660 LOC diode both projected on a wall after 20 meters to do some measurements will reveal some more details like beamsize and divergence

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