NIST scientists create 'any wavelength' lasers

> Your cone cells do not perceive anything whatsoever.

They most certainly do. Your brain may apply meaning to the signals the cone cells send, but it is the cone cells which send a signal for one color and a different signal for another. That's what perception is.

> Those who grew up with words (meaning) assigned to subtle variations in colors can tell those colors apart without a reference to compare it to better than, and much faster than those who haven't grown up with learning the distinction.

No they can't. There is no evidence at all of better color differentiation, and if they were able to better differentiate then they wouldn't be faster because those who were less capable would never be able to. The vocabulary makes labeling faster, and that is all that such tests are measuring.

> We know this to be obvious of sounds, musicians who can tell if a note is slightly out of tune when others who haven't learned how can't.

Knowing the names of notes doesn't make it any easier to tell if a note is out of tune. If you weren't aware before, middle C is 261.62 hz. Can you now tell if a note is .01 hz off middle C? No of course not. Musicians learn to differentiate notes because they spend tremendous amounts of time listening to sound and being corrected when the note they hit isn't the one they are going for. Similarly an orange farmer will know the difference between the color of a ripe orange and the color of a few days under ripened orange, despite not having a distinct word for either. If you're having a blind taste testing competition between someone who drinks lots of wine but has no formal education, and someone who is extremely learned in somellier vocabulary but has never actually had a glass of wine before, it's pretty obvious who is going to be better at distinguishing two vintages.

> You're not thinking in photons. Your brain is making up meaning from the stimulation your eye received from photons. The perceiving part is learned.

You are perceiving photons, or more accurately the firing of neurons triggered by those photons. The meaning your brain applies is a label for what you are perceiving - it's a categorization. You see the color of an apple, you learn that color is called red. You see another apple, and you ask why that one's a different color, and then you are told there are also green apples. But you did not need to be taught to differentiate red apples and green apples, you directly perceived it. The difference between cyan and azure exists even if you don't have the vocabulary to communicate that difference to someone else.

There is a difference between perception and categorization. You perceive the difference between salmon and fuchsia regardless of whether you have a word for them or not. You might refer to either color as pink, not because you failed to perceive the difference but because you don't particularly care about communicating the difference.

It's like measuring with a ruler. If you have mm notches then you'll be more likely to describe one thing your measuring as 31mm and another as 29mm, whereas if you have only cm notches then you'll probably say one is just over 3cm and another is just under 3cm. In the second case, you're measuring with a less accurate tool because you don't care as much about accuracy. Hell you may say they're both about the same size if that 2mm difference is insignificant enough. But regardless of how you communicate the length, their lengths exist and you qualitatively perceived them.

i just see cyan on the first one, seems like an exaggeration if anyone is expecting to see 'new' colors

Is that through solid-core fiber? Because hollow-core fiber also exists.

> I haven't heard of a wavelength of 2 frequencies merged. It is like saying what is the wavelength if you tune to 2 radio stations with 2 radios

No, any wave has a wavelength. You can add sin(3x) to sin(2x) and the resulting wave is a perfect fifth. Its wavelength is determined by its components; since sin(2x) has a wavelength of π and sin(3x) has one of 2π/3, the combined wave will have one of 2π.

The difference is that sin(2x) and sin(3x) are both sine waves, while their sum is not. There is no such thing as a pure tone of two merged frequencies, but there are many possible waves at any given frequency that aren't pure tones.