characteristics of leaser beam

hi for all
I hope you are all in the good condition
pease helpme
I want to know how leaser beam work and its characteristics like wave length
also how the leaser beam represent zero and one on the surface of CD
please help me.
thanx
"Gersy"

Hi moud

just go to http://electronics.howstuffworks.com/cd1.htm

and keep browsing to the NEXT PAGE

PL