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?
wave length of blue laser is less than that of red this mean more finite structure it can etch ,there by improving the storage capacity , Today thosiba come up with 42GB HD DVD