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We report the first observation of the emission of coherent light by an electron beam bunched at 1.06 {μ}m by a Nd-doped yttrium aluminum garnet laser focused into an optical klystron. An enhancement of 10² to 10³ over its spontaneous emission level at 355 nm has been observed in these experiments performed at the ACO storage ring at Orsay.
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Girard et al. (1984) studied this question.
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