On the microstructure of thermal and fluid flow field in a lasing medium of a high repetition rate dye laser

A high repetition rate, tunable dye laser suffers from thermal and flow field-induced inhomogeneity inside the laser-active zone of the dye solution, and shows a significant disparity in the spectral characteristics. The thermo–optical distortion developed in the lasing medium of dye solution, under high repetition rate pumping, perturbs the dynamics of the medium. The microstructures of the flow field in the hydrodynamic boundary layer, which are responsible for heat transfer, optical path length modulation, and divergence of the seeding radiation, transform the output characteristics of dye laser. The structure function, which represents the intensity of flow velocity fluctuations, and the eddy diffusivity of fluid flow help in design and development of a high-power tunable dye laser.