Femtosecond pulse self-shortening in Kerr media: role of modulational instability in the spectrum formation
Abstract
The mechanism of femtosecond pulse self-shortening in thin optical materials with Kerr nonlinearity is investigated. The experimentally observed spectral-angular distribution of the radiation intensity on the exit surface of a 1-mm-thick fused silica sample is compared with the results of numerical simulation based on solving the nonlinear Schrödinger equation for an electromagnetic wave with a transverse perturbation on the axis. Qualitative agreement between the calculated and experimental results confirms the hypothesis about the transient regime of multiple filamentation as a mechanism of femtosecond pulse self-shortening.
- Publication:
-
Quantum Electronics
- Pub Date:
- April 2018
- DOI:
- 10.1070/QEL16670
- Bibcode:
- 2018QuEle..48..306G