I. Introduction
The MARKET for optical storage systems is rapidly growing. While today's CD-ROMs have a capacity of 650 MB, future DVD-ROMs will achieve a storage capacity of more than 30 GB. This is accomplished not only by the use of multilayer disks but also by the use of smaller dimensions on the disk itself, for which the availability of UV/blue semiconductor laser diodes [1] Absorption of light in silicon for nm and nm (highly doped p<sup>+</sup>-anode on n-substrate with a concentration of cm<sup>−3</sup>, V).