Laser power (au) versus the longitudinal coordinate normalized to the gain length. The continuous line corresponds to the exact treatment. The computation has been done under the condition , where is the number of periods corresponding to the saturation length.
First harmonic and total energy spread versus the longitudinal coordinate (analytical dotted line, numerical continuous line).
Same as in Fig. 2, with the inclusion of third and fifth harmonics.
Same as in Fig. 3, for different values of the initial energy spread: (a) ; (b) ; (c)
Power growth versus the longitudinal coordinate for a cascade undulator scheme with two sections. The first section is operating at , while the second section, having the same K value, is tuned on the second harmonic of the first.
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