I read that the recent development of the blue ray disks that can hold more data than the DVD uses a blue coloured laser that is generated from Galium Nitride.

I was just wondering whether the disperssion of blue laser makes it imprecise???

Doesn't storing more information on less surface require a higher degree of accuracy?

So how is blue laser better than the red laser?

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Bharath Bhushan Lohray.
M.Sc. Electronics.

 

Blue light has a shorter wavelength than red light and can be focused more precisely. Blue has only recently been used due to the difficulty in producing blue LEDs/lasers. When Ultra Violet LEDs/Lasers become cost effective then we will have a new format and have to throw all our old format discs away - again.

Mike.

 

yeah, again! nothing like backward compatability, with dvd-r drives having four sets of laser and optics now, can you imagine trying to fit eight or ten in?

 

How much power does the blue ray laser put out?

I'm waiting to see how long it takes to get them out onto the surplus market with focused optics. Blue laser pointer- kick ass! Blue doesn't have great eye sensitivity, though.

That would complete the red/green/blue palette, making full color laser light shows, hack jobs of 3D displays, etc possible.

 

Does anyone know the pit-land sizes of blu ray disk ?

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Bharath Bhushan Lohray.
M.Sc. Electronics.

 

I've seen some pretty good laser shows in Barmouth in Wales, they had all the colours, very powerful ones as well.