Blu-ray Disc Association (BDA) gave an update on their blue laser technology. BDA felt that it was time to highlight its progress in bringing “the new high definition format” to market

As per wikipedia, Blu-ray Disc (also known as Blu-ray or BD) is an optical disc storage media format. Its main uses are high-definition video and data storage. The disc has the same dimensions as a standard DVD or CD.


The name Blu-ray Disc is derived from the blue-violet laser used to read and write this type of disc. Because of its shorter wavelength (405 nm), substantially more data can be stored on a Blu-ray Disc than on the DVD format, which uses a red (650 nm) laser. A dual layer Blu-ray Disc can store 50 GB, almost six times the capacity of a dual layer DVD.

Blu-ray Disc uses a "blue" (technically violet) laser operating at a wavelength of 405 nm to read and write data. Conventional DVDs and CDs use red and near infrared lasers at 650 nm and 780 nm respectively.

The blue-violet laser's shorter wavelength makes it possible to store more information on a 12 cm CD/DVD sized disc. The minimum "spot size" on which a laser can be focused is limited by diffraction, and depends on the wavelength of the light and the numerical aperture of the lens used to focus it. By decreasing the wavelength, increasing the numerical aperture from 0.60 to 0.85 and making the cover layer thinner to avoid unwanted optical effects, the laser beam can be focused to a smaller spot. This allows more information to be stored in the same area. In addition to the optical improvements, Blu-ray Discs feature improvements in data encoding that further increase the capacity. (See Compact disc for information on optical discs' physical structure.)



Sony has just now introduced the Blue ray Disc Player's

The new BDP-S1 Blu-ray Disc home player from Sony offers a host of new high-definition entertainment possibilities. The BDP-S1 features 1920 x 1080p output, the highest HD signal output currently available through a HDMI connection. If your HD-capable television does not have an HDMI connection, you can still get the Blu-ray experience - the 1080i analog output allows for HD-capable televisions without HDMI to enjoy Blu-ray Disc features.
The BDP-S1 is also compatible with standard DVDs with the added feature of 1080p upscaling through HDMI, which gives new life to existing DVDs libraries3. BD-Java interactivity will further enhance the BD entertainment experience, allowing for development of advanced interactive features. Its sophisticated design, with blue glass front, will compliment any decor. Bring your home entertainment experience to a new level with the BDP-S1 Blu-ray Disc home player.


The summersized information of Blu-Ray Disc is as follows