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Thread: 445nm to White or yellow

  1. #1
    Join Date
    Jul 2010
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    Default 445nm to White or yellow

    Hi everyone,

    I'd thought I'd kick of another conversation.
    Recently I got some special "filters" that I think use fluorescence to convert blue lasers into white or yellow.

    Intrigued I reached out and bought the components as parts.
    I power both units and indeed out comes a very wide spread white and yellow (see pics below)
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    I noticed a lack of speckle.. first weird part of it.

    However I persued and teared down the white unit:
    What I got was this:
    Click image for larger version. 

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    A black removable plastic cap contained the entire assembly that converts the 445nm (1watt blue diode outputting 943mw ) to the "white".

    I held it in front of a 445nm laser to try and it worked great.
    445nm blue laser output once black assembly is removed:
    Click image for larger version. 

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    The spread on it is enormous so I tried a focusing lens and while I could get it in focus I would get a fairly large spot.. no speckle but all in white with a little bit of color separation if you'd tilt the lens.
    A larger lens was included which I could get this from if I moved it away a bit from the assembly:
    Click image for larger version. 

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    I tried smaller lenses assemblies like the ones used in aixis laser housings.. sadly that didn't improve much.
    Here are pictures of the small black assembly:
    Click image for larger version. 

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    Either the emitter turns huge or this light has lost it's coherency upon the conversion. Any thoughts?
    Last edited by masterpj; 02-05-2021 at 15:32. Reason: Better thread name

  2. #2
    Join Date
    Mar 2012
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    Akron, Ohio USA
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    Default

    Yes. The white light cannot possibly be coherent or polarized so it's no longer laser light.
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  3. #3
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    Default

    Ah damn. I thought it was possible but the trade of was that there was a short life span.
    I guess the same goes for the yellow
    Last edited by masterpj; 02-05-2021 at 21:13.

  4. #4
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    checked out the yellow. Assembly is identical.. the only difference is a filter on top.. probably is some kind of dichroic that just keeps reflecting the remaining light back and letting through only the yellow portion.
    Was hoping there was maybe a way to get something out of it but that's a shame!

  5. #5
    Join Date
    Nov 2008
    Location
    Cleveland Ohio
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    Default

    It works same as white led. 445 causes yellow fluorescence. That mixed with the blue is white to your eye. Add a blue filter and you only see the yellow. Sorry no laser action there.

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