Scientists have discovered that a laser beam can be effectively used to record alphanumeric data and sound on crystals. According Russian researchers a method for recording information on crystals by means of a laser has already been developed, but advanced technologies are needed to make it commercially applicable.
At present researchers are looking for the most suitable chemical compounds to be used as data storages and trying to determine optimum recording conditions. Theoretically, the entire "Great Soviet Encyclopedia" can be recorded on a single tiny crystal.
As far back as 1845, Michael Faradey discovered that a light beam reverses its polarization as it passes through a magnetized crystal Scientists of our day have used this phenomenon to identify crystalline materials capable of storing information. Lasers have been successfully employed to record information on and read it off.
No ideal data storage crystal has yet been found, but it is obvious now that the future of computer engineering lies in lasers and optoelectronics. As paper gave way to magnetic tape, so the latter is to be replaced by tiny crystals.
Exercise 1.Read the text and about practical application of lasers.