Fig. 1.
(a) SC spectral phase from 4 nJ 350 fs seed pulses for different fiber lengths with the transform limit and power spectrum inset. Evolution of the (b) power spectrum (c) residual spectral phase after GDD compensation (residual phase set to −5 outside of the −20 dB power spectral envelope) and (d) local and accumulated characteristic lengths all as a function of fiber length. The local dispersion length and accumulated dispersion lengths, χD, are in blue and the local nonlinear length and accumulated nonlinear length, χNL, are in black. The calculated length for the onset of WB, 62 mm, is included as the vertical dashed white line in (b) and (c) and dashed black line in (d)