title: Flow and thermal characteristics of high Reynolds number (2800-17,000) dye cell: simulation and experiment.
abstract: This paper presents computational and experimental studies on wavelength/frequency fluctuation characteristics of a high pulse repetition rate (18 kHz) dye laser pumped by a frequency-doubled Nd:YAG laser (532 nm). The temperature gradient in the dye solution is found to be responsible for wavelength fluctuations of the dye laser at low flow rates (2800<Re(d)<5600). The turbulence Reynolds number (ReT) and the range of eddy sizes present in the turbulent flow are found to be responsible for the fluctuations at high flow rates (8400<Re(d)<17,000). A new dimensionless parameter, dimensionless eddy size (l(+)), has been defined to correlate the range of eddy sizes with the experimentally observed wavelength fluctuations. It was found that fluctuations can be controlled by keeping ReT≈10 and lmax(+)≈1. The simulated result explains the experimental observation and provides a basis for optimizing the dye solution flow rate for high PRR pumping.
authors.forename: G K
authors.initials: GK
authors.lastname: Mishra
authors.forename: Abhay
authors.initials: A
authors.lastname: Kumar
authors.forename: O
authors.initials: O
authors.lastname: Prakash
authors.forename: R
authors.initials: R
authors.lastname: Biswal
authors.forename: S K
authors.initials: SK
authors.lastname: Dixit
authors.forename: S V
authors.initials: SV
authors.lastname: Nakhe