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Light strings draw together

Light strings draw together

Self-focusing occurs at high intensities in transparent media when the refractive index is proportional to the intensity. The change in refractive index causes the medium to act as a lens that focuses the laser – hence the name self-focusing. This lens is the ultimate adaptive-optics element as it responds instantly to the shape of the […]

Nuclear symmetry enters a new phase

Nuclear symmetry enters a new phase

The point at which a phase transition occurs is called the critical point and is dear to every physicist’s heart. The fascination with systems at the critical point stems from the fact that a small change in one parameter, such as temperature, can trigger spectacular changes in the other properties. Indeed, it is this discontinuity […]

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