Study of output power of very high pulse repetition rate (18 kHz) dye laser pumped by frequency doubled diode pumped Nd: YAG laser (λ ∼ 532 nm)

This paper presents a comprehensive study of variation of output power of an 18 kHz pulse repletion rate dye laser pumped by frequency doubled Q-switched Nd: YAG laser (lambda similar to 532 nm) against the dye solution flow rate (2800 < Re-d < 15 400). The experimental results are explained on the basis of computational fluid dynamics calculations. A new concept of low yield boundary layer (LYBL) has been proposed in this paper to explain the low output power at low flow rates (2800 < Re-d < 5600). The increase in output power, when the flow is increased, is found to be related to the reduction in the thickness of this boundary layer and increase in the fraction of the total pump beam power being utilized for dye laser production. At higher flow rates, the size of eddies present in the moving dye solution starts dominating and adversely affect the output power.