The Blu-ray Disc belongs to a new generation of optical discs capable of staging high density data. Blu-Ray technologies is according to a blue-violet coloured laser. The blue laser operates at a wave length of 405 nm, whilst older technological innovation for example DVDs and CDs are based on red and infrared lasers that works at 650 and 780 nm. Since the wave length is shorter using a blue laser, the new Blu-ray technological innovation creates is probable to store a great deal more facts

The advantage with the Blu-ray technology is that the laser beam can be focused a great deal more tightly at the surface of the disc. Tight focus means that a smaller spot will be produced within the surface within the disc, and when the spots turn out to be smaller there will naturally be room for far more facts on each disc. The minimum spot size of any laser depends on a naturally accruing phenomenon named diffraction. The narrow beam of light sent out from a laser will always diverge into a wider beam eventually, due towards the natural diffraction of waves. Diffraction will also occur the waves meet an obstruction. By reducing the wavelength of a laser, we can affect the diffraction.

In Blu-ray engineering, the diffractions is also affected by the fact that the lens applied to concentrate the light has a higher numerical aperture than the lenses found in ordinary DVDs - 0.85 as opposed to 0.6. Blu-ray engineering dependent appliances are also equipped having a dual-lens system of supreme high quality, and also the cover layer has been made thinner in order to prevent unwanted optical effects. All this helps make it achievable for a Blu-ray laser to concentrate on significantly smaller spots. The optical improvements are accompanied with a new technique for encoding info which tends to make it doable to shop even a lot more data on the Blu-ray disc.

The standard for Blu-ray technologies has been developed as a joint venture between several major manufacturers of PCs and consumer electronics, including Sony and Philips. The group is referred to as the Blu-ray Disc Association (BDA). The 1st Blu-ray recorder was launched in Japan in 2003, by Sony. Nowadays, Samsung, JVC, Matsushita (Panasonic) and LG Electronics are all examples of companies using Blu-ray technological know-how in their products. Hewlett Packard has announced that they will release desktop PCs equipped with Blu-ray technology in late 2005.

The main competitor for the Blu-ray technology is the HD DVD format which is also capable of storing far more details than a normal DVD. The Blu-ray technology does however enable for far more details per layer than the HD DVD format - 25 GB compared to 15 GB. The Blu-ray technological innovation will on the other hand most likely be more expensive to support, at least initially, which can make the HD DVD a tempting alternative. In a Blu-ray disc, the data is stored very close towards surface. This produced the primary Blu-ray discs extremely vulnerable to scratching and a lot of users preferred the tougher HD DVD discs. Given that 2004, all Blu-ray discs are coated with a clear polymer named “Durabis” which creates them a lot more durable. According to the developers of Durabis, the TDK Corporation, a coated Blu-ray disc will work even after being attacked with a screwdriver.

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