We analyze the propagation of an extremely short optical pulse from the numerical solution of the Maxwell’s equation related to the effective action obtained in the framework of the theory of superstrings in flat time space. The pulse dynamics turned out to be unstable and eventually leads to a collapse. We particularly analyze the Schwinger mechanism which occurs during the collapse of the pulse.
The problem of the propagation of an extremely short optical pulse in a medium of carbon nanotubes with nonlinear absorption and amplification is considered. Nonlinear absorption is described phenomenologically based on published data. The mode in which the gain is higher than the linear absorption coefficient is considered. This mode is also described phenomenologically. The extremely short optical pulse is considered on the basis of Maxwell's equations, with a microscopically calculated dependence of the current on the pulse field. The possibility of efficient generation of higher harmonics that are not initially present in the pulse is shown.
Генерация высших гармоник при распространении предельно короткого оптического импульса в среде углеродных нанотрубок с нелинейным поглощением
