Quasistationary pulse generation in flash-lamp-pumped Nd~(3+):Y_3Al_5O_(12) laser mode locked through quadratic polarization switching

摘要

Extended quasi-steady-state pulse train is developed through the all-solid-state combination of passive negative feedback in a GaAs platelet and positive feedback through cascaded χ~((2)) polarization switching. With an actively mode-locked flash-lamp-pumped Nd~(3+): Y_3Al_5O_(12) laser, stationary pulse trains lasting for 1 μs with pulses of duration of 11.6 ps and energy of 6.5 μJ are obtained. The total output amounts for 1.73 ml and the pulse evolution demonstrates that the semiconductor two photon absorption is able to realize a pulse compression from 43.9 to 11.6 ps.