Re: What are the main differences between Blu-ray players?
The main difference is the color of the laser used. Regular DVD players have used the traditional red laser, whereas the new Blu-Ray DVD players use an innovative blue laser. So what's the big deal? The primary difference is that blue light has a shorter wavelength than red light and thus allows the capability of faster speeds, more data storage, advances in miniaturization, and improved efficiency overall, among others.
The blue laser light is emitted by GaN semiconductors, which are very expensive to produce and extremely rare.
The first blue laser was produced by Dr. Shuji Nakamura in late 1999 in Nichia Chemical Corporation Laboratories.