Hi Song
Thanks for posting that link, It's a great little rescource. I'm often asked to explain how a laser works and this is (hopefully) simple enough for anyone to understand.
Cheers
Jem
Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.”... Douglas Adams 1952 - 2001