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Thread: ML520G72 diode properties

  1. #1
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    Default ML520G72 diode properties

    Got some testing time tonight for this diode.

    Using the same lens 405-g-2 the red diode has 2.55 times the divergence of the 445nm diodes we've come to love. The 'beam' does look like a flashlight coming from the lens, in fact I have flashlights that are more collimated correction tests to follow..

    update: Here are the results using a few lenses I had in stock:

    405-g-2 (broadband coat, ~4mmfl): 400mA 239mW; 70mm wide beam at 26'

    aixiz red lens (red coat, ~8mm fl): 400mA 176mW; 35mm beam at 26'
    340mW @ 700mA (should be about 490mW)

    laser66 'red' lens (red coat, ~8.x mm fl): 400mA 173mW; 34mm beam at 26'
    244mW at 525mA

    The losses, and the better divergence with the second two lenses are because of the longer focal length which also clips the fast axis.

    The combination of one of the longer focal length lenses and the cylindrical correction optics in the group buy/kit will give a good beam, but clipping from the collimating lens will mean 30-35% losses will be necessary.

    Given these results, it appears that PBS combining two 150mW 642's will cost just a little more, have much better divergence, and a little less visible brightness.

    For beams, the combination of a 6mmFl lens and the cyl lens set from the group buy and in the module kits will extract most of the optical power from the diode and provide about 1.2mrad divergence, which isn't too bad.

    In conclusion: with the right lenses these make good beamshow diodes however the 150mW 642nm diodes are the right choice for graphics and precision.
    Last edited by drlava; 09-07-2010 at 20:36.

  2. #2
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    Does anyone have the exact dimensions of the stripe.
    That way we can simply calculate the best achievable theoretical beamspecs.

  3. #3
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    Quote Originally Posted by drlava View Post
    Got some testing time tonight for this diode.

    In conclusion: with the right lenses these make good beamshow diodes however the 150mW 642nm diodes are the right choice for graphics and precision.
    Which 150mw 642nm diodes are these?
    Known source ? Price? Specs ?

    Thanks

    Cheers

  4. #4
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    Wink

    ..............
    Love, peace, and grease,

    allthat... aka: aaron@pangolin

  5. #5
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    Quote Originally Posted by drlava View Post
    .

    For beams, the combination of a 6mmFl lens and the cyl lens set from the group buy and in the module kits will extract most of the optical power from the diode and provide about 1.2mrad divergence, which isn't too bad.

    Thanks for sharing!

    So with the FL8 lens you have about 30% loss due to clipping, the FL4 almost got no clipping, so can we say the FL6 lens got aprox 15% loss dus to clipping?

    I would be very interested in a dual red setup with 2 x 500mW - 15% = 850mW with a 1,2 mRad beam

    When can we order?

  6. #6
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    yes that's right! however, there won't be any knife edging these babies for a dual that still fits on common scanners with those losses and 1.2mrad, you're going to have to use a PBS. and that means 2 sets of correction optics. :O

  7. #7
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    Quote Originally Posted by drlava View Post
    Given these results, it appears that PBS combining two 150mW 642's will cost just a little more, have much better divergence, and a little less visible brightness.
    .

    Or we do something like this with 640's ( or 637's )

    Attached Thumbnails Attached Thumbnails red.JPG  

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  8. #8
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    would you get less clipping from the prisms?

    how about the 250mW 642nm diodes?

  9. #9
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    Quote Originally Posted by flecom View Post
    would you get less clipping from the prisms?

    how about the 250mW 642nm diodes?

    Which 250mw 643 diodes are these?

    Info pls

    I NEED RED !!!

    Thanks

    Cheers

  10. #10
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    Quote Originally Posted by dave View Post
    Or we do something like this with 640's ( or 637's )

    Which 637s ????

    Cheers

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