Why don't they go with Violet-ray instead of blu ray?

[SG 117]

I've known from Science class that different colours have different wavelengths. Red being the longest, and violet being the smallest, with blue being somewhere in between. If the reason for blue lazers is so you can get a more accurate reading due to a shorter wavelength, why not go with violet? They have the shortest wavelength of them all, why not go with that? You could fit even more onto the disks. Is it because they would be too expensive, or because we don't have the technology to create such precision hardware at this time? Or is there some other reason, does anyone know the answer to this?

[tron3]

Originally Posted by SG 117

I've known from Science class that different colours have different wavelengths. Red being the longest, and violet being the smallest, with blue being somewhere in between. If the reason for blue lazers is so you can get a more accurate reading due to a shorter wavelength, why not go with violet? They have the shortest wavelength of them all, why not go with that? You could fit even more onto the disks. Is it because they would be too expensive, or because we don't have the technology to create such precision hardware at this time? Or is there some other reason, does anyone know the answer to this?

May I offer up some educated guesses?
1. Marketing. Blu-ray MEETS the need. Violet woul proabably exceed the need to the point of making the technology too expensive for mainstream retail.

2. Marketing. :? Why sell the best now and leave nothing for later?

3. Technology. Maybe violet wasn't reliable enough. Try burning a violet ray onto those purple bottom discs, what do you think will happen? OR, maybe it is partly in the violet spectrum but just call it blu... again, marketing. "Violet ray". Not so cool sounding, is it.

[erdega79]

http://www.t3.co.uk/news/default.asp...bsectionid=753

It's "in development"

Pioneer goes beyond Blu-Ray

The future's bright, the future's ultraviolet


Just when you thought that 25GB was a fairly decent size for an optical disc, it transpires that Pioneer is working on a technology that makes Blu-Ray's capacity seem rather underwhelming. According to a report in the Nikkei Business Daily, Pioneer is developing a new optical technique using ultraviolet lasers rather than rotten old blue ones and that should give us optical discs with a 500GB capacity.

The shorter wavelength ultraviolet beam can create data holes 70 nanometres apart and results in a data rate 20 times higher than Blu-Ray. Pioneer has yet to officially announce its new technology so there's no word on how long it'll be before you can actually buy one. But seeing as the capacity of a single disc is bigger than most of our hard drives, we're happy enough to wait a while for it.

It's probably 10 year off. It's players will probably be compatible with blu ray disks but with 4 terabyte storage. But that's in 10 years or so :wink:

[Rob]

What about the nano technology based holgraphic discs with 1.5 million GB? Collosal disc storage or something. 1.5 Exabytes I believe on one dvd size disc! :shock:

[Gorkab]

Originally Posted by Rob

What about the nano technology based holgraphic discs with 1.5 million GB? Collosal disc storage or something. 1.5 Exabytes I believe on one dvd size disc! :shock:

Holographic discs have been so many time announced for the market that I don't think it will blow out the market until years and years... :|

[Rob]

Blu-Ray actually uses a blue/violet laser by the way. They call it Blu-Ray for simpilicty. Sounds better than Violet ray. Though Vio-Ray doesn't sound too bad thinking about it...

[darth_ash]

Refer the Blu-Ray white paper. It says that the plastics used to make optical discs become less durable; and hence, the plastic looses its transparency after wavelength of blue(approx 400nm).
They have even shown a graph showing it.

P.S.: you can view the white paper at www.blu-raydisc.com
go the the "techincal info" section. And then the "technical paper" section.
And refer the first paper (the general one)