A Sum Rule for Nonlinear Optical Susceptibilities

Details A Sum Rule for Nonlinear Optical Susceptibilities A Sum Rule for Nonlinear Optical Susceptibilities

2003-05-30

arxiv.org/abs/physics/0305131v1

J. Opt. B: Quantum Semiclass. Opt. 6, 59-62 (2004)

Physics

Optics

11 pages

Scientific paper

10.1088/1464-4266/6/1/010

It is explicitly shown, for optical processes arbitrarily comprising two-, three- or four-photon interactions, that the sum over all matter states of any optical susceptibility is exactly zero. The result remains true even in frequency regions where damping is prominent. Using a quantum electrodynamical framework to render the photonic nature of the fundamental interactions, the result emerges in the form of a traceless operator in Hilbert space. The generality of the sum rule and its significance as a thermodynamic limit are discussed, and the applicability to real systems is assessed.

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