Abstract
In this contribution, we report on the investigation of energy scaling in modelocked fiber oscillators based on recent experimental results. Our numerical simulation is done with a non-distributed model, treating every part of the cavity (Fig.1.a) separately by solving the nonlinear Schrodinger equation with the split-step algorithm [1]. The parameters for each element match those of the experimental setup in [2], where the generation of microjoule pulses is demonstrated in a low nonlinearity large mode area (LMA) photonic crystal fiber (PCF) oscillator without dispersion compensation. Calculated pulse solutions show very good agreement with the experimental data in [2]. Guided by the results of a recent systematic experimental study on the dispersion issue in modelocked fiber lasers [3], we applied the chirped pulse concept to the LMA-PCF laser by incorporation of a positive dispersive element with negligible nonlinearity directly in front of the gain fiber, in order to achieve further energy and peak power scaling.
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