This is set of lectures made by Richard Feynman on quantum mechanics or to be precise on QED - quantum electrodynamics. Quality is poor but his explanation of light phenomena from QM point of view is fantastic.
I have to say, almost everything Feynman related is worth a read. I consider Surely You're Joking, Mr. Feynman! to be one of my favorite books. I also recently picked up the Feynman Lectures on Physics, so needless to say, I will be occupied for a while!
Feynman is one of my personal inspirations. He had such a unique way of looking at everything and his brilliant personality and insight comes across very well in his books and lectures.
Brilliant guy!