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By consideration of the conversion of photons into axions in the presence of a classical background magnetic field, the possibility of creating artificial sources of ``invisible'' axions with a laboratory experiment is stressed. With, in particular, a high-power laser, the attainable axion current density seems to be as high as that expected from the natural astrophysical sources, provided that the axion mass is not much larger than 10^-5 eV.
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M. Gasperini (1987) studied this question.
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