Conservation of the temporal shape of the space integrated power of femtosecond pulses during nonlinear propagation
- Liu, Y
- Jiang, HB
- Gong, QH
DOIAbstract
The spatiotemporal transformation of a focused femtosecond laser pulse during nonlinear propagation in fused silica was investigated numerically. We found that the on-axis intensity of the pulse experiences a shortening of pulse duration, formation of a double peak and then an evolution to one peak as a result of the interplay of plasma-induced defocusing, self-focusing and diffraction. By contrast, the temporal profile of the space integrated power of the pulse retains the initial shape but with a slight depletion due to the nonlinear loss. As a result, although it is possible to obtain a shortened pulse by selecting the central portion of the pulse at appropriate locations, the percentage of available energy cannot exceed the percentage o...
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