Old 12-30-2007, 07:23 PM #1
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Default Why do blu-ray players use expensive blue diodes?

Ive always wondered why blu-ray players use blue diodes that are expensive compared to red or ir. *I can only think of like 2 reasons for this maybe because the shorter nm will focus smaller, or because they have the name blue-ray?

I also think i see a pattern, cd burners use ir, dvd burners use red, blu-ray's use blue/violet. Since they go in order of how much data they hold cd's at the least dvd's next and blu-ray's next, does that also mean its because of the short wavelength.

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Old 12-30-2007, 07:45 PM #2
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Default Re: Why do blu-ray players use expensive blue diod

Bah! the only reason the damn things are expensive is cause they are "special" "new" "better" it's called you want it cuase it's new and we're gonna charge you an arm and a leg for it. the blurays probably don't cost much more than the red or IR's to make.
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Old 12-30-2007, 07:48 PM #3
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Default Re: Why do blu-ray players use expensive blue diod

I also think i see a pattern, cd burners use ir, dvd burners use red, blu-ray's use blue/violet. Since they go in order of how much data they hold cd's at the least dvd's next and blu-ray's
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Shorter wavelength allows more data can be written in the same amount of space.
no pattern. IR laser diodes came out first then low power red, then high power red. Then blue and violet diodes as they require very high quality manufacturing.



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Old 12-30-2007, 07:56 PM #4
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Default Re: Why do blu-ray players use expensive blue diod

I almost left my google friend all alone... lol. I was thinking they were more expensive cause the research they had to put into em, altho im sure they cost the same to actualy make unless the they had to use diamonds to get it blue ;D

They need to get some gamma ray diodes you would be able to fit like 500gb on a single disc lol. (or is gamma the biggest i cant remember)


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Old 12-30-2007, 07:58 PM #5
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Default Re: Why do blu-ray players use expensive blue diod

actually I read somewhere a article about the ability to store 100's of GB of data in a hologram that is read by a laser. and that was only in a micrometer.
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Old 12-30-2007, 08:48 PM #6
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Default Re: Why do blu-ray players use expensive blue diod

Indeed CDs, LDs, DVDs and BluRay/HD-DVD have always used the shortest wavelength diode available at the time to get the highest data-density possible. It's more than just focusing per se: a smaller Airy disc is important too for greater track and linear bit densities.

With BluRay/HD-DVD they got a little ahead of themselves and the 405nm diodes weren't quite ready at launch.

Going forwards shorter wavelengths help but the limit here may be practical disc replication. Hollywood can only make money if that $20 movie costs no more than a few pennies to make 8-) and at some point pressing ever-smaller features will become impractical, long before we get to the point of using coherent beams of electrons...

There are many other industrial uses for small, short wavelength diodes but consumer CD/DVD/etc players have the biggest volumes and get the most R&D to drive costs down.
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Old 12-30-2007, 09:02 PM #7
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Default Re: Why do blu-ray players use expensive blue diod

Quote:
Originally Posted by Kenom
actually I read somewhere a article about the ability to store 100's of GB of data in a hologram that is read by a laser. and that was only in a micrometer.
Most of thee 100's of GB proposals I've seen so far would just stack many layers atop each other. 100 GB is quite doable today with 405nm lasers using four layers.

If any of the ~ 300nm laser diodes work out then 100 GB in a single layer will happen, if disc replication is practical with such small features and if there is demand for 100 GB layers.

And if you brought back the old Laser Disc form-factor with 405nm lasers and dual or quad layers ... I'm not sure what the capacity would be but I'm guessing near or even at TB capacities.
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Old 12-30-2007, 10:43 PM #8
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Default Re: Why do blu-ray players use expensive blue diod

Oh, just you wait. Kiloquads, Terraquads.... Of course, "Peta" is more proper, but people will still call 'em, quads. Imagine the day - a terraquad - 1 million gigabytes - in something the size of a pack of gum. Nice!

It's coming sooner than you think!

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Old 12-31-2007, 12:45 AM #9
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Default Re: Why do blu-ray players use expensive blue diod

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Originally Posted by xanatos
Oh, just you wait. *Kiloquads, Terraquads.... * *Of course, "Peta" is more proper, but people will still call 'em, quads. *Imagine the day - a terraquad - 1 million gigabytes - in something the size of a pack of gum. *Nice!

It's coming sooner than you think!
Carry the entire internet around in a flash drive....
Il'e wait....
*drools* :P
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Old 12-31-2007, 02:50 AM #10
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Default Re: Why do blu-ray players use expensive blue diod

You know what might be fun? Getting ahold of a blu-ray burner diode.
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Old 12-31-2007, 06:56 AM #11
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Default Re: Why do blu-ray players use expensive blue diod

Quote:
Originally Posted by Kenom
actually I read somewhere a article about the ability to store 100's of GB of data in a hologram that is read by a laser. and that was only in a micrometer.
That's only a theory, and no prototype has been made as of yet. The only way this is achievable is with 100+ virtual layers, which seems impossibly meticulous by optical standards to me.
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Old 01-01-2008, 08:18 PM #12
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Default Re: Why do blu-ray players use expensive blue diod

I am looking forward to HVDs (holographic versatile discs) - from a laserists point of view!
reason is, according to wikipedia, the read/write-laser of such would be a 532nm green laser - thus maybe the prices of green (diodes maybe???) lasers might surely drop into the future!

Still, it'd be way better if they decided to use 472nm instead
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Old 01-01-2008, 08:33 PM #13
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Default Re: Why do blu-ray players use expensive blue diod

Quote:
Originally Posted by Phazonx
You know what might be fun? *Getting ahold of a blu-ray burner diode.

If you have a few hundred to risk you can buy an external Blu-Ray burner and you MIGHT be able to get a playing and burning diode, could also just be one lased at different levels.
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Old 01-01-2008, 08:48 PM #14
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Default Re: Why do blu-ray players use expensive blue diod

LOL i heard, on a single layer blu-ray disk, can hold about 25gb. Thats a hell of alot for a CD ;D What about a terrabyte flash disk? ;D ;D ;DLOL i heard, on a single layer blu-ray disk, can hold about 25gb. Thats a hell of alot for a CD ;D What about a terrabyte flash disk? ;D ;D ;D
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Old 01-03-2008, 01:56 AM #15
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Default Re: Why do blu-ray players use expensive blue diod

Got carried away with the copying and pasting?

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Old 01-03-2008, 03:56 AM #16
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Default Re: Why do blu-ray players use expensive blue diod

Hey - know what?
prototypes of hologram disc recorders have been made and do exist. Talking about 400GB on something the size of an ol' school ZIP disk. Google it.
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