What about GreenRay/PurpleRay diSC?


#1

Hello.
I wonder, how the current laser frequencies were determined.
Can somebody provide clues?


#2

I guess 405nm was used to match and track the width of the pits in a blu-ray disc. At that wavelength the colour is actually in the violet range. I hope that helps a bit. There is possibly much more info if you google the question.


#3

Actually, HVD used a green beam partially.


#4

And HVD also use a red ray to enhance capacity.

The format was dead before it was released, AFAIK.

And for your general question, look at the light spectrum

Like you see, blue have a shorter wavelength than red, so you can faster submit data with blue than red.

And like voxsmart wrote, searching in the internet will provide you more data


#5

The invention of the blue LED summed up in video: