Propagation characteristics of light

Changing the Propagation Characteristics of Light The Pockels Effect. 

Because of their application as electro-optic (EO) materials the appropriate choice is to measure Pockels coefficients Vy which alter the propagating characteristics of light in the medium. However, we found Vy too small for any quantitative analysis of the microgravity effects, instead, we opted to monitor the relaxation of second harmonic (SH) signal. 

Changes in the light propagation characteristics of a fiber due to temperature arise from (a) thermally induced length changes (b) the temperature dependence of the core refractive index, and (c) elasto-optic changes in the core due to thermally induced stress/strain changes. 

Nonlinear Optics Nonlinear optics is basically concerned about the interaction of optical frequency electromagnetic fields with materials, resulting in the alteration of the phase, frequency, or other propagation characteristics of the incident light. 

As aforementioned, the spectral characteristics of LPGs are determined by the coupling between the fundamental guided core mode and the co-propagating cladding modes when the core propagating light encounters a periodic perturbation... 

However, the intra-atomic Coulomb interaction Uf.f affects the dynamics of f spin and f charge in different ways while the spin fluctuation propagator x(q, co) is enhanced by a factor (1 - U fX°(q, co)) which may exhibit a phase transition as Uy is increased, the charge fluctuation propagator C(q, co) is depressed by a factor (1 -H UffC°(q, co)) In the case of light actinide materials no evidence of charge fluctuation has been found. Most of the theoretical effort for the concentrated case (by opposition to the dilute one-impurity limit) has been done within the Fermi hquid theory Main practical results are a T term in electrical resistivity, scaled to order T/T f where T f is the characteristic spin fluctuation temperature (which is of the order - Tp/S where S is the Stoner enhancement factor (S = 1/1 — IN((iF)) and Tp A/ks is the Fermi temperature of the narrow band). 

Electromagnetic Radiation The propagation of varying electric and magnetic fields through space at the speed of light, exhibiting the characteristics of wave motion. 

The dominant characteristic of the electrical and magnetic fields that comprise electromagnetic radiation is their periodically oscillating nature, a fact that enables us to describe them by the mathematics of waves. For light scattering, it is the electric field that is of interest. The oscillating nature of an electric field propagating in the positive direction is described by the equation... 

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