Coherence Definition and 115 Threads

Hey folks. I'm giving a poster at a conference in a month or so and I'm supposed to explain my research (optimal control of quantum systems in dissipative environments) to people from many other disciplines (psychology, biology, etc). I'd like to hear any tips those on this board have on how to...

Is there an established context in which the oscillation of a pendulum between potential and kinetic forms of energy can be described in term of coherence, that is, viewed as an oscillation between coherence and incoherence? (here incoherence is taken as the antonym of coherence)

Hi. I have 2 questions about second-order coherence – g2(t): 1) For collision-broadened light according to the literature g2(t)=1+|g1(t)|^2, where g1(t) is the 1st order coherence. Therefore for very low collision rate g1(t) =1 and thus g2(t)=2. However I would expect collision broadened...

Homework Statement light is incident on an equilateral triangular prism (n=1.55) at a 35 degree angle from the normal to one of the faces. What is the exit angle?Homework Equations The Attempt at a Solution 45 degree

Homework Statement What is partial coherence , its in my syllabus but teacher has not taught us & my university exam is in a few days ? Any links will be useful Homework Equations The Attempt at a Solution

I'm bit confused about using terms temporal coherence and transverse/longitudinal spatial coherence when speaking about electro-magnetic radiation. I have understood that temporal coherence basically means how monochromatic light is. But I don't understand why temporal coherence is related...

Hi, I just passed a course of a quantum coherence theory (or quantum optics). However, during the course i found more questions rather than answers. One particular: Imagine there's a white light coming from the sun. What is the coherence length of this light, according to the quantum...

Please,can someone explain me spatial coherence?

Hi, I would like to know what do you think about the Giuliano Preparata theory on QED coherence in matter. He studied the problem of the ground state in condensed matter under the hypotesis that the standard perturbative vacuum is unstable with respect to a new coherent vacuum, whose...

just wondering why all photons produced in a laser beam are coherent? what forces them to have the same phase?

why do different probability waves synchronize into one coherent wave at low temperatures? I'd like to research this but I don't know what this effect is called. Also, what is the quantum mechanical explanation for why the resistance in a super-conductive metal drops down to 0? Is it that the...

I'm having some trouble understanding the idea of coherence. Consider the phrase: "a coherent superposition of states." Here I understand the coherence to refer to the states being coupled to each other and capable of interfering, due to a perturbing field. How does this relate to...

To spin my last post a bit further: It appears that one could say then that the temporal coherence of a given frequency spectrum can not be less than the coherence time associated with the spectral width of any absorption features in the spectrum. Thomas

Hi! I'm new here, but I hope that someone would evenly help me! My first question is about the problem (3.3 on page 100 from Loudon - The Quantum Theory of Light 3ed) in the attachment; the second question is about discussing (I)the physical origin of fluctuations of the electromagnetic...

Pascal principle with light pressure Hello, Supose you have an U tube, in which the inner walls are made absolutelly reflective. Now, put a termical state (temperature T) for the radiation field inside the tube and close it with reflective discs which can slide without friction. Supose...