Schimpf, D.N.D.N.SchimpfSeise, E.E.SeiseEidam, T.T.EidamHädrich, S.S.HädrichLimpert, J.J.LimpertTünnermann, A.A.Tünnermann2022-03-112022-03-112010https://publica.fraunhofer.de/handle/publica/36670610.1117/12.841864We experimentally demonstrate that circular polarization state is beneficial if the Kerr-nonlinearity has to be lowered during the amplification of laser pulses. It can be shown that in a fiber-based chirped pulse amplification (CPA) system, the use of circularly and linearly polarized light result in different B-integrals, which are measured using phase-only pulse-shaping. The theoretical value of 2/3 for the ratio of the B-integrals of circularly and linearly polarized light is experimentally confirmed. Circularly polarized light facilitates peak-power scaling, moreover, the self-focussing threshold can be enhanced.enultrafast laserfiber laser and amplifierYtterbiumnonlinear fiber opticphotonic crystal fiber620conference paper