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ArcticMyst Security by Avery

Mixing lasers-question

Joined
Nov 18, 2009
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Ok, i saw that u can mix lasers with the dichros, but id just like to know if u can tune around the mixed color. For example, u get a red and green laser, and mix them with a dichro. People usually say that the best mix for the yellow would be a 4:1 ratio (red, green). If u start messing around with the power output of either of the lasers, could u tune up to a higher, lower wavelength (more yellowish, more orange, for example) or would you just get a slight tint in the mixed colour towards the one that is more powerful (like the jayrobs first yellow pointer pic where its slight off to green).

ok, now that i read what i wrote, i feel like im doin a dumb question, mainly because of the example pic i gave, but even so, id like to know.

thanks for reading. :thanks:
 
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Oct 10, 2007
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Hi.

If this is new for you there ware no dumb questions!
Mixing lasers will usually be done through dichros.
E.g.:

Green laser hitting a dichro that passes green on one side and reflects red on the other.
With the right mixing you get a nice yellow.
As you already wrote the mixture should be around 1:4 (green:red), depends on what red wavelenght you are using. You need quite alot 650 / 660 to get a nice yellow but you would need less 635 as this is more like orange and therefore a bit brighter.

In projectors you use analogue modulaltion so the hard and software can determine how much green and red it will put it to get the right color. Of course you can adjust that as the software can't see what it is mixing.

Basicly you can say, yes, setting the lasers at different powers will give you a better mix.

-Stephan
 
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Sep 12, 2007
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If you have an RGY projector, you can get an approximating for any wavelength between the two being used by varying the power via modulation. So in a word, yes.

476px-CIExy1931_fixed.svg.png


For any two (or more, I guess) wavelengths, any point in between them can be attained. It goes to show exactly WHY RGB is far more colorful than RGY.

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as i mixed with programs using the RGY code (like photoshop, gimp, paint, etc), puting blue in 0, and messing with the green and red i could think that. but then the other way (the slight tint to the side of the most powered laser) seemed reasonable too. As u increased greens power, for example, it would start to override the red, and our eye wouldnt percept it as a fine misture of colours, like the 4:1 650nm to 532nm (yeah, i knew the wavelegths, but i just didnt care about it in the question :p) but a greenish pale yellow, or a reddish colour where u cant really see whats doin it, but u arent seeing the 650nm red, and u arent seeing an orange or yellow either. Both seemed kind of reasonable when talking about what we see.
I guess that if u have 2 beams perfectly alligned, and same divergence at the mixed laser u could in fact see a perfect mix of colours, that can be tuned to (as cyparagon said "between both wavelengths") match the colour desired.

and im talking about a laser beam, a still one, where u can admire it. and analyze it like i kind of described. With a laser scanner u couldnt for example witness the slight tint to the green like Jayrobs pic on his yellow pointer.

thanks for your answers, now id just like to build an orangish laser or a cyan/turquoise one...oh well:eek:
 




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