High-efficiency coaxial waveguide dye laser with internal excitation

A new configuration for flash-pumped dye lasers is presented. A coaxial dye cell with internal excitation is used and 2% efficiency is feasible. Optical cavity deterioration produced by thermally induced refractive index gradients is compensated by the coaxial geometry, and low-loss guided propagation results without any recirculation of the dye solution.