Live data from Hacker News

NIST scientists create 'any wavelength' lasers

nist.gov

71–80 of 201 posts

Re: NIST scientists create 'any wavelength' lasers

#71
post #24

Everyone talking about magenta and brown, but you can see an illusory color right now even without lasers! https://dynomight.net/colors/ behold, some kind of hyper-turquoise

FYI if you get ocular/retinal migraines like me then the exercise in this article might be a bad idea.

Re: NIST scientists create 'any wavelength' lasers

#73
I don't know to much about photonics but if they ever figure out the boolean algebra and register storage it would be really cool. You have 1 photo cpu core but just use different wavelengths for different threads running in the core. I am sure its way more complex than that but articles like this make you dream about how much we don't know

Re: NIST scientists create 'any wavelength' lasers

#76
post #42
post #24

Everyone talking about magenta and brown, but you can see an illusory color right now even without lasers! https://dynomight.net/colors/ behold, some kind of hyper-turquoise

The whole idea of colour and light frequency is fascinating. These are just frequencies of light, but the subjective experience of them is so much more. And the whole thing of my perception of "red" or what I call "red" could be very different to someone else's subjective perception. But we would both call it red and associate it with the same thing, fire, love, heat, danger etc.

> what I call "red" could be very different to someone else's subjective perception

It's worth noting that is true of virtually everything we know. >>This is a very simple sentence.relationships between the different concepts or colors will be analogous amongst most people - so a common understanding within the differences is possible. Or perhaps it is more precise to say that there are so many data points in color perception or anything we know, that despite the minor differences in relationships, we understand each other because the differences must be minimal given the practically unlimited data points constraining our perceptions. In fact, when people's perceptions of things vary too much, they can be classified as mentally ill even if they understand many things perfectly well.

Re: NIST scientists create 'any wavelength' lasers

#77

Earlier quoted context omitted.

I think it's important to remember that we're not perceiving some fundamental aspect of light. We're perceiving how the photosensitive portions of our retina convert light to stimulus, and how our brains construct a meaningful image from that stimulus in our mind. Like film photography doesn't happen in the lens or the world. It happens in that photosensitive chemical reaction, and the decision of the photographer.

It reminds me of how vinyl records are fairly lossy, but they provide a superior experience in some cases because those limitations have been accounted for during the mastering process. It's an entire pipeline from photomultiplier to recording medium to the inverse process and everything is optimized not for any particular mathematical truth but for the subjective experience.

Most records these days use CDs as masters, sadly.

Re: NIST scientists create 'any wavelength' lasers

#78
post #61
post #49

Earlier quoted context omitted.

It's called orange. Much like bright gray is called white, and bright teal is called turquoise.

Light brown is called tan. Dark and light oranges exist too and they’re not exactly the same as brown.

See Technology Connections' video about Brown: https://www.youtube.com/watch?v=wh4aWZRtTwU

He says brown is perceived when you see an orange-wavelength light that is significantly darker than its surroundings, providing the necessary context for your brain to interpret it as brown.

Re: NIST scientists create 'any wavelength' lasers

#79
post #57

Earlier quoted context omitted.

But also - colours don't exist without a name eg. Before Orange, there was only shades of yellow or reds

The colors most certainly exist without the name. You may have described the fruit as being a weird shade of red, but if someone held up something red and said "so it was this color" you'd say no. Conversely if someone held up something that was actually orange colored, you'd say "yeah it was that color." Similarly, you may have no idea what the name is for the color of a Tangerine, but you know what that color is. Y…

I don't think so. Just becoming fluent in multiple languages can result in the perception of more distinct colors. And those fluent in languages that have additional distinct color names can differentiate subtle differences in the shades of colors that non-speakers cannot even differentiate. Color is less about seeing what is actually out there and more about how our brain interprets colors to create "meaning".

Re: NIST scientists create 'any wavelength' lasers

#80
post #38

Earlier quoted context omitted.

Two wavelengths do it; one does not suffice. It's like a perfect fifth can not one note.

The interference is a wavelength too. Maybe not pure but it is one. Afaik they cannot be interpreted as two separate wavelengths and then “brain combined” when the aperture (the retina) is so small.

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 (assume silent transmition for simplicity). There are 2 wavelengths.
Post reply on HN