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if an object is transparent, are the energy bandgaps in the structure too large for even the 400 nanometer photon to be able to make a transition? I wouldn't use the term "bandgap", but yes. For example small molecules (like $H_2$, $O_2$, $CO_2$, etc.) have very few allowed energy states at room temperature. Kinetic and rotational energies can ...


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Classical interference In optics classical interference is when you see interference that can be described by a coherent wave-like behavior (such as in a double slit experiment or in an interferometer). A quantum picture of such an interference is that you have a group of photons each prepared in identical states, and each photon interferes only with itself ...


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Short answer Quantum optics is a field/branch of physics, with QED being a specific theory. Those working in quantum optics use a fully quantum theory (QED) when needed, but otherwise resort to using simpler tools such as the semiclassical approximation (classical field and quantum matter) which accurately describe a wide range of experiments (primarily ...



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