Optical-fibre passively mode locked laser generator with nonlinear polarisation switching

摘要

A passively-mode-locked laser generator comprising an active optical fibre and fibre pumping means adapted to cause the generation of an emission signal in the fibre, a polarization control means, signal extraction means and at least one optical component with transmissiveness depending on polarization, all inserted in an optical fibre path that, for a pumping energy lower than a predetermined value corresponding to a linear propagation condition of the signal, gives rise to a polarization rotation of the emission signal through an angle causing the extinction of the signal itself within said optical component with transmissiveness depending on polarization and, for a pumping energy of a higher power than said predetermined value, causes a polarization rotation of the emission signal through an angle corresponding to the transmission with low losses within said optical components of the only pulses of high peak power of the emission signal.