Abstract
The effect of the high-order dispersions on a femtosecond pulse enhancement in an external resonator is analyzed. It is shown that the degradation of the enhancement factor can be partially compensated by adjustment of group-delay, dispersion and incident pulse width. Presence of a Kerr-medium inside an external resonator results in the stable quasi-soliton formation that improves the enhancement factor. This provides the enhancement factor growth as well as its robustness against the high-order dispersions, when the fourth-order dispersion is negative.
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