Passive Q-switching of Nd:YAG lasers by dye-doped polyurethane-based elements

Effects of polyurethane matrix polarity on the spectral, nonlinear-optic and switching properties of thiopyrilo-4-tricarbocyanine phototropic dye were studied. The experimental results of passive Q-switching for the neodymium laser by Q-switches based on aliphatic polyurethane of high dielectric permittivity were presented. Positive influence of polymer matrix polarity on high-efficient generation of powerful single pulses was shown.