Abstract
We investigate experimentally the role that the initial temporal profile of ultrashort laser pulses has on the self-focusing dynamics in the anomalous group-velocity dispersion (GVD) regime. We observe that pulse-splitting occurs for super-Gaussian pulses, but not for Gaussian pulses. The splitting does not occur for either pulse shape when the GVD is near-zero. These observations agree with predictions based on the nonlinear Schrödinger equation, and can be understood intuitively using the method of nonlinear geometrical optics.
Highlights
8. J.K. Ranka, R.W. Schirmer, and A.L. Gaeta, “Observation of pulse splitting in nonlinear dispersive media,” Phys
Theory predicts that as the beam self-focuses the transverse profile evolves initially to a ring solution [17, 18], which was confirmed experimentally [19]. These results provided compelling evidence for the role of the initial beam shape on the spatial collapse dynamics, and motivated the development of the nonlinear geometrical optics (NGO) method for analyzing beam collapse without the need for full integration of the
We find that no pulse-splitting occurs at the zero-group-velocity dispersion (GVD) regime, regardless of the initial pulse shape
Summary
8. J.K. Ranka, R.W. Schirmer, and A.L. Gaeta, “Observation of pulse splitting in nonlinear dispersive media,” Phys. 9. S.A. Diddams, H.K. Eaton, A.A. Zozulya, and T.S. Clement, “Amplitude and phase measurements of femtosecond pulse splitting in nonlinear dispersive media,” Opt. Lett.
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