Terahertz beams are required in many scientific and technological applications, ranging from the imaging of biological materials to manipulating quantum states in semiconductors. However, existing terahertz sources have only been able to generate low-power beams. Now, Gwyn Williams, from the Jefferson Laboratory, and colleagues at the Brookhaven and Lawrence Berkeley National Laboratories in the US have created a beam that is several orders of magnitude more powerful than any existing source (GL Carr et al. 2002 Nature 420 153).
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