Abstract
Recently, the possibility was discussed of creating an x-ray free-electron laser (FEE) using a high-power laser pulse as the undulator (optical-wiggler FEE).1 The optical-wiggler FEE is characterized by relatively low energy of the used electrons [(e ~ 1)/10 MeV], To achieve high gain for x rays we use monoenergetic e-beams (Ay/y ~ I0_4) and wigglers with a large number of periodic elements (N > 104). In such FEE, the energy of x-ray quantum can exceed the induced emission (absorption) linewidth:
© 1992 Optical Society of America
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