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Crystals light up Apart from lasers and free-electron lasers, there has not been a new way of producing coherent light for nearly half a century. Now, physicists in the US have found that coherent electromagnetic radiation can be generated in crystalline materials when they are subjected to a shock wave. The technique, which generates light in the terahertz region (1012Hz), could provide a new tool for determining the properties of crystals (Phys. Rev. Lett. 96 013904).
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