Thanks for the response. Your answers have created more questions for me.
1) Does the principle of coherence apply to sources other than lasers? Could you have an x-ray source that emits coherent xrays?
2) Does the intersection of two non-coherent sources produce altered wavelengths...
I am familiar with the idea of amplitude increases that can be produced by waves that are "in phase". I can imagine this easily with sound or water. I have 2 questions with regard to EM radiation:
1) Do the same principles apply with light/EM radiation? What does "in phase" mean on a...