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)

Abstract

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 (λ ~ 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.

Linewidth of a high pulse repetition rate (~20 kHz) class dye laser

“…[16] discuss the effect of thermal and flow related inhomogeneity on the wavelength fluctuation of the dye laser with the help of computational fluid dynamics (CFD) calculations. [8] discussed the effect of output power using the same approach. introduced the new fluid flow parameter dimensionless eddy size [6] and a lowyield boundary layer [8] to provide a semiquantitative basis for the observed physics.…”

“…[8] discussed the effect of output power using the same approach. introduced the new fluid flow parameter dimensionless eddy size [6] and a lowyield boundary layer [8] to provide a semiquantitative basis for the observed physics. These studies were performed for the dye solution flow Reynolds number (R e d) in the range of < < R 2800 170 00 e d .…”