solid - state laser diode is the type of laser used in cd and dvd players.
solid - state laser diode is the type of laser used in cd and dvd players.
what type of laser is used in cd and dvd players?
solid - state laser diode
commercial laser diodes emit at wavelengths from 375 nm to 3500 nm. low to medium power laser diodes are used in laser pointers, laser printers and cd/dvd players. laser diodes are also frequently used to optically pump other lasers with high efficiency. the highest power industrial laser diodes, with power up to 20 kw, are used in industry for cutting and welding. external-cavity semiconductor lasers have a semiconductor active medium in a larger cavity. these devices can generate high power outputs with good beam quality, wavelength-tunable narrow-linewidth radiation, or ultrashort laser pulses.
laser
backward compatibility is available with all hd dvd players, allowing users to have a single player to play all types of hd dvd, dvd and cd. there is also a hybrid hd dvd format which contains both dvd and hd dvd versions of the same movie on a single disc, providing a smooth transition for the studios in terms of publishing movies, and allowing consumers with only dvd players to still use the discs. dvd replication companies can continue using their current production equipment with only minor alterations when changing over to the format of hd dvd replication. due to the structure of the single-lens optical head, both red and blue laser diodes can be used in smaller, more compact hd dvd players.
hd dvd