This course follows “Laser Principles” or “Laser Engineering” where you learned the classical description of the interaction of light with matter and laser operation. We will use semiclassical laser theory, (i.e., we will quantize the matter but not the field, and use Maxwell’s equations), introduce field quantization, which allows for a fully quantum mechanical treatment of quantum electrodynamics, and Q.E.D., where both the matter and field are quantized.