Wang Renwen, Lei Shizhan. A free electron laser with variable spacial period length in weggler[J]. Chinese Journal of Lasers, 1983, 10(7): 385
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In order to maintain the constant gain coefficient and invariable phace difference between pumping field and radiation field of a free electron laser, we use a variable spaeial period length g which decreases gradually along the transmitting direction of relativistic electrons in the weggler. Thus the energy conversion efficiency of free electron laser can be raised. The equation for g of the resonator different from that of an amplifier of free electron laser is also given.