藍光
维基百科，自由的百科全书
藍光光碟乃由其採用的藍色zh-tw:雷射;zh-cn:激光光束來進行讀寫操作而得名。藍光光碟指的並不是單一產品，也不是專用於某一特定產品的名稱，凡是採用藍色光束的光碟都可稱為藍光光碟。
[编辑] 目前商品化的藍光光碟產品
[编辑] 藍光概觀
Blue lasers have applications in many areas ranging from opto-electronic data storage at high-density to medical applications. Until the mid 1990s, blue lasers were large and expensive gas laser instruments which relied on population inversion in rare gas mixtures and needed high currents and strong cooling. In the mid 1990s Shuji Nakamura at Nichia Chemical Industries in Anan (Tokushima-ken, Japan), made a series of inventions and developed commercially viable blue and violet semiconductor lasers based on gallium nitride compound sectors by using quantum wells or quantum dots spontaneously formed via self-assembly. This invention enabled the development of small, convenient and low priced blue, violet and ultraviolet UV lasers which had not been available before and opened the way for applications such as high-density HD DVD data storage and BD（Blu-ray Disc）. The shorter wavelength allows it to read discs containing much more information.
Blue laser light usually has a relatively low input-to-power efficiency. Blue lasers usually operate at around 472 nanometers.
The use of indium gallium nitride as a semiconductor material suitable for formation of quantum heterostructures has been proposed. Recently, CdS/ZnS quantum dots have been used as the gain material in spherical Whispering Gallery Mode lasers; see Applied Physics Letters, 2005, 86:073102.
Shuji Nakamura built his blue laser prototype from the gallium nitride crystal developed by Unipress, the Warsaw Center for High Pressure Research, part of the Polish Academy of Sciences.
