Iscuss the use of Lasers in Compact Disk Players for audio (CD) and computer applications (DVD)

the essay should include the principles of operation of these systems, their historical development, and an indication of future trends. Presentation must be clear, logical, well structured, well researched and referenced.

Referencing Requirements:
All references material should be clearly indicated. Include references and a bibliography (Including Full web URLs), using an appropriate reference formats (harvard). citing references within the body is required.