Abstract
We theoretically study the generation of odd and even harmonics in particular in free electron lasers (FELs). The comparative analysis is held for the spectral properties of SPARC and LEUTL FEL radiation. We analyze several different theoretical approaches to the harmonic power computation, in particular with regard to even harmonics. We compare the results with available data for SPARC and LEUTL FELs. The influence of such FEL parameters as the finite beam section, emittance and originating from it betatron oscillations on the harmonic generation and radiation is analyzed.
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