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Thread: Making blue light from green light

  1. #1
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    Default Making blue light from green light

    I'm just going to let these pictures that I just took speak for them self. There's no trickery going on here. It's simply making blue light from green. Even works with a 5 mW laser pointer.

    Click image for larger version. 

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    Anyone care to guess how I did this?

  2. #2
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    Upconversion via excited state absorbtion? Anyhow, very interesting!

  3. #3
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    does it come out blue or does it just look blue in the liquid?

  4. #4
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    Hey Sir Tocket...

    Quote Originally Posted by tocket View Post
    Anyone care to guess how I did this?
    Fluorescein? Blueberry Jello? Well, whatever is is, get a focusing lens and a resonator on that puppy and send us s'more pix!

    cheers...
    j

    PS - I think it's really bitchin that we have so many 'varied skills', here, within the 'PL-Family'... I think PL could make one helluva Laser Show Co. I mean, we've got it all -
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    Long live PL!
    cheers...
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  5. #5
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    Default

    Lanthanide nanoparticles?

  6. #6
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    Nice to see some guesses. You haven't managed to solve the mystery yet though. I'll give a first hint: The blue light is in fact quite violet - The emission peak is around 410 nm, but the emission is rather broad and comes from a well known organic dye.

    Quote Originally Posted by andythemechanic View Post
    Upconversion via excited state absorbtion? Anyhow, very interesting!
    A bunch of excited states are involved - quite complex process. However, it does not require any double excitations, which is why it works at such low power densities.

    Quote Originally Posted by flecom View Post
    does it come out blue or does it just look blue in the liquid?
    It's just blue in the liquid. The absorbance of the solution is pretty low at 532 nm, so only a small part of the light is absorbed.

    Quote Originally Posted by dsli_jon View Post
    Fluorescein? Blueberry Jello? Well, whatever is is, get a focusing lens and a resonator on that puppy and send us s'more pix!
    Wish I had a resonator. Though I suspect this system would actually prefer to lase at a completely different wavelength than 410 nm. Perhaps 700 nm? Not very useful for us.

    Quote Originally Posted by Robin View Post
    Lanthanide nanoparticles?
    No lanthanides required

  7. #7
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    Quote Originally Posted by tocket View Post
    Nice to see some guesses. You haven't managed to solve the mystery yet though. I'll give a first hint: The blue light is in fact quite violet - The emission peak is around 410 nm, but the emission is rather broad and comes from a well known organic dye.


    A bunch of excited states are involved - quite complex process. However, it does not require any double excitations, which is why it works at such low power densities.
    Hm, is it possibly a FRET like energy transfer from serveral excited molecules to another? Do you have it published already?

    Greetings
    Andreas

  8. #8
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    Quote Originally Posted by andythemechanic View Post
    Hm, is it possibly a FRET like energy transfer from serveral excited molecules to another? Do you have it published already?

    Greetings
    Andreas
    You're getting close now. There's no Förster energy transfer involved in the process though.

    Similar systems have been published. I don't think this particular one is out yet, but it's not my publication. I'm working more towards an application of it you could say.

  9. #9
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    this thread is WAAAAAAAY beyond my pay scale! lol.

    Very interesting though!

    so, my answer of, "Pretty green light makes weird wet stuff turn blue-ey in color" is not an acceptable answer i gather?

    -Marc
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  10. #10
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    Time for another clue: The system is very sensitive to oxygen. If a little air gets in no blue light is generated.

    Quote Originally Posted by gottaluvlasers View Post
    this thread is WAAAAAAAY beyond my pay scale! lol.

    Very interesting though!

    so, my answer of, "Pretty green light makes weird wet stuff turn blue-ey in color" is not an acceptable answer i gather?

    -Marc
    Well, your answer is correct. Just not very specific.

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