The advent of blu ray technology has led to the introduction of high capacity storage discs to meet the demand cause by the rapid growth of high definition television hdtv blu ray discs get their name from blue laser technology the shorter wavelength of the laser is the reason it is blue in colour the blue laser has a wavelength of 405nm compared with the wavelength of 650nm for dvd which utilises red laser technology the benefit of having a blue laser with a shorter wavelength means it