Fu Ensheng, Wang Zhijiang. Properties of higher harmonic operation in storage ring FELs[J]. Chinese Journal of Lasers, 1988, 15(5): 257
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In this paper, we propose that when wiggler magnetic parameter, using higher harmonic operation for a storage ring free electorn laser, we can not only obtain shorter wavelength coherent radiation, but may also get more gain than that of the fundamental harmonic with the same wavelength. At the same time, the initial laser intensity needed for the higher harmonic operation is lower than that for the fundamental harmonic operation. A possible experimental scheme is also presented.