The Hpyerphysics site, while discussing coherent light of lasers, says that… “the emitted photons are "in step" and have a definite phase relation to each other.” So now I wonder about electrons of an atom absorbing photons. Assuming the correct energy level for a given photon, is the probability of an electron getting excited to a higher energy level dependant on the phase of the photon, and/or the phase of the electron? What about polarity. Is that a factor? Is there theoretical evidence of experimental evidence one way or the other? References would be greatly appreciated, as Google searches for this brings up all kinds of unrelated stuff.