445 turning white when hitting certain surface why?

I dont really know much about how lasers work when they hit a certain surface but why do these 445 diodes turn really bright white when they hit a orange surface? was just fooling around with one of my diodes today and it hit something orange and it turned bright white. Can anyone tell me why it does this? I am including a few pictures. The second picture is with a 445 diode hooked up to a flexmod 3 with no modulation and the first one is with it hooked to 3.3v on the modulation on whatever the flexmod came set to. Does blue and orange make white?

It is flouressing the orange and adding blue to it; orange is red and green, add blue and you get white... kinda; enough for us and the camera to see white. :cool:

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Originally Posted by aktopjian

I dont really know much about how lasers work when they hit a certain surface but why do these 445 diodes turn really bright white when they hit a orange surface? was just fooling around with one of my diodes today and it hit something orange and it turned bright white. Can anyone tell me why it does this? I am including a few pictures. The second picture is with a 445 diode hooked up to a flexmod 3 with no modulation and the first one is with it hooked to 3.3v on the modulation on whatever the flexmod came set to. Does blue and orange make white?

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The colour your eyes see is a combination of the red, green and blue light being detected by your retina.

The orange surface is orange because it reflects red and green light combined (orange). Add blue to red and green and you get white!

I believe there is a scientific principle for the effect of a surface emitting its own colour characteristics despite being lit by a difference wavelength (in this case 445nm). But I can't remember what it is!

Just like allthatwhichis said. It is fluorescing and the product is a white color. The same thing will happen if you take a 405nm laser and shine it at anything white (with detergent in it) white clothing, white paper..... it will fluoresce bright blue, I would say in the 475nm ~ 490nm range. This is exactly how dye lasers work. There is a stream of optical dye that uses another laser (typically argon or nitrogen) that pumps the dye. It fluoresces in between a HR and OC thereby turning the fluorescing dye into a lasing medium.

Ahh that all makes sense now. Thanks for the info.

Speaking of dye lasers, here is a pic. The optical cavity is a work of art in itself. You can see the hose coming out of the top with the fluorescent orange Rhodamine dye in it. It is being pumped by an argon laser.

Attachment 24991

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Originally Posted by aktopjian

I dont really know much about how lasers work when they hit a certain surface but why do these 445 diodes turn really bright white when they hit a orange surface?

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This phenomena is easily explained.

The laser photon excite the surface Unobtanium filaments. These filaments are crystal tubes enclosing one dimensional space. The effect is achieved by first inducing superconductivity in a planar space and then continuously deforming the crystal plane enclosure into crystal tube. One dimensionality is achieved the superconducting current breaks symmetry to split into a gravitational component and a very strong nuclear force component. The very strong nuclear force component strengthens the filament along the longitudinal direction and the gravitational component binds the crystalline matrix to the filament.

When an unobtainum filament is stressed the resistance of the very strong nuclear force component strengthens the gravitational component. If the stress is sufficient the filament collapses into a black hole string which explodes via the Hawking effect. The blue wavelength light is then sucked in to the black hole string and ejecta from the radial axis emits light at the mystical wavelength r(t) = (roe2)nm. where r = local reality and t = time in seconds before supper. The mystical wavelength is broadband spectral oscillation inversion layer, creating macro Spielberg effect in space time.

Pretty straight forward really. O_o

HUH? Yea what he said.

LOL dnar :p if you say so

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Originally Posted by dnar

This phenomena is easily explained.

The laser photon excite the surface Unobtanium filaments. These filaments are crystal tubes enclosing one dimensional space. The effect is achieved by first inducing superconductivity in a planar space and then continuously deforming the crystal plane enclosure into crystal tube. One dimensionality is achieved the superconducting current breaks symmetry to split into a gravitational component and a very strong nuclear force component. The very strong nuclear force component strengthens the filament along the longitudinal direction and the gravitational component binds the crystalline matrix to the filament.

When an unobtainum filament is stressed the resistance of the very strong nuclear force component strengthens the gravitational component. If the stress is sufficient the filament collapses into a black hole string which explodes via the Hawking effect. The blue wavelength light is then sucked in to the black hole string and ejecta from the radial axis emits light at the mystical wavelength r(t) = (roe2)nm. where r = local reality and t = time in seconds before supper. The mystical wavelength is broadband spectral oscillation inversion layer, creating macro Spielberg effect in space time.

Pretty straight forward really. O_o

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Where do you come up with this $hit?

My guess is performance-enhancing drugs.

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Originally Posted by Lazerjock

Where do you come up with this $hit?

My guess is performance-enhancing drugs.

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Lighten up Jock. It was all in jest. [popcorn]

ROFLMAO...
Looks like you reeled one in....>:)

Jerry

I thought it was hysterical. I didn't mean it in a bad way. I guess my post didn't come across quite right.
Sorry.

Chris

So much talk about this phenomenon, but did anyone see how casio did the green colour in their laser projector? (before scraping those damn diodes I mean)

They did it in a very clever way...

maybe this is a silly repply, but why does so little people mention it? how they obtain the green colour! (I was amazed), genial.

I'm getting old very quickly, but I think someday with just a blueish laser and the proper dye, someone wil find a way of colimating that white light...

cheers :o

It was mentioned lots in the early days when 'we' (some clever folk, not me at all...) first discovered the casio projectors. I suspect why you don't hear about it now, is that for most of the people here its old news.
Cool, but old....

hi norty303.
I can't imagine what is old for you.
I know how many times you talk about it.
But really, i was away from photonlexicon for a long (too much I think) time.
And this shit of talking three languages at a time is killing me!
So mY dear friend, despite I am in a hurry to finish my thesys about "the laser semiconductor in 2D and 3D applications", I cannot think in anything else but wtf are they talking about?
Hope this repply don't bore anyone. Soon, very soon I hope I'll come back with all my skill's... And those heavy collimators that I have to "round" that son of a b....
And please don't suspect anything about anyone. If you have facts, then call me an asshole. Just joking...lol

with best regards to all of you my friends.
I'm tired...
But life still goes on...
And so do I.