Old 09-29-2010, 02:48 PM #1
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Exclamation what fourmula do i use to find output wavelength of 3 random wavelangth when combined

What fourmula do I use to find output wavelength of 3 random wavelangths when the the three are combined in differant combenations???


P.S. An online calculator that uses the "nm" unit is what I'm looking for idealy...

Alternetives: Fourmula(s) / links / other


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Old 09-29-2010, 02:53 PM #2
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Default Re: what fourmula do i use to find output wavelength of 3 random wavelangth when comb

Didnt know T_J had a bro

not sure on ur question tho...one of the members with some brains will be right along tho
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Old 09-29-2010, 03:05 PM #3
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Default Re: what fourmula do i use to find output wavelength of 3 random wavelangth when comb

not only does the wavelengths combined matter but the power of each respective wavelength must be taken into consideration as well. as i am on my phone, i cannot find links, but you can search out an app called chroma, which will take in variable data regarding wavelength and power of each, and show you what power/luminous flux/resulting output when mixed.
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Old 09-29-2010, 03:10 PM #4
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Default Re: what fourmula do i use to find output wavelength of 3 random wavelangth when comb

Wavelengths describe pure colours only. If you combine multiple wavelengths the resulting colour cannot be described in terms of a single wavelength. For example, I can combine a red, green, and blue laser to make "white" but this light is not really white, it's just perceived as white by my weak, imprecise, organic eyeballs. The colour "white" cannot be described in terms of wavelength and in the case of combining lasers it doesn't even really exist.

...That is, unless you're talking about sum frequency generation whereby multiple low-energy photons are combined to create a single high-energy photon. Then there is a formula involving Mr. Planck's constant which describes the wavelength of the output photon in terms of the photon energies of the input wavelengths.
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Old 09-29-2010, 03:12 PM #5
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Default Re: what fourmula do i use to find output wavelength of 3 random wavelangth when comb

I posit that you probably need to convert mW into lumens first. The conversion would depend on what wavelength the light is. This is done using a coefficient for luminous efficacy based on the wavelength of light. From there, you would have wavelengths paired with their lumens output, and you can then do an average weighted with the lumens output. This ought to work, I think.

Actually, googled it and sam's faq has some decent info:
Sam's Laser FAQ - Items of Interest

Also, wiki article on luminous efficacy, which is in layman's terms, how bright a certain amount of radiation of a specific wavelength appears to us humans.
Luminous efficacy - Wikipedia, the free encyclopedia
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Old 09-29-2010, 07:02 PM #6
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Default Re: what fourmula do i use to find output wavelength of 3 random wavelangth when comb

Chroma is a program that does color mixing for you for monochromatic light sources. It was made by a guy named tocket, and works quite well.

The downfall for visualization of the resulting color though, is the fact that your computer monitor can display nowhere near all the colors that can be made by a combination of 3 monochromatic light sources. Therefore, the only way to actually visualize the mixture of 3 laser colors accurately is to use 3 lasers yourself with your own eyes.
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Old 09-29-2010, 07:05 PM #7
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Default Re: what fourmula do i use to find output wavelength of 3 random wavelangth when comb

I see now this thread takes the title for the longest thread title
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Old 09-29-2010, 08:40 PM #8
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Default Re: what fourmula do i use to find output wavelength of 3 random wavelangth when comb

But generally .. for red and green you get combination which will look like wavelength between those two, in a ratio of power. For green and blue the same. For red and blue, you get purples, those are non-spectral, so no single wavelength can apply for them.
If you combine all 3 base colors, you will usually get something toward white, again, no wavelength can describe it.
You can think about purples and whites as chords in music.
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Old 09-30-2010, 02:11 AM #9
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Default Re: what fourmula do i use to find output wavelength of 3 random wavelangth when comb

Google 'chroma photonlexicon'. It should be the first hit that comes up. Though keep in mind that chroma's calculations are based on light striking a pure white surface. Beam appearance in the air is going to be different due to the various types of scattering that takes place.
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