Bibliography:
http://www.umw.edu/Dept/Grad_Sch/Publications/ResearchProfile/Vol21No1/marija
http://www.colorado.edu/physics/2000/lasers
http://www.school-for-champions.com/science/lasers.htm
http://www.thetech.org/exhibits/online/lasers/Basics
http://www.macgeek.org/instruction/cdarticle.htm
http://www.hyperphysics.phy-astr.gsu.edu/hbase/audio/cdplay.html
http://www.hardwaresecrets.com/article.php?id=77