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 ($2800<R_{e^d}<5600$). The turbulence Reynolds number ($R{e}_T$) and the range of eddy sizes present in the turbulent flow are found to be responsible for the fluctuations at high flow rates ($8400<R_{e^d}<17000$). 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 $R{e}_T\approx 10$ and $l_{\max }^{+}\approx 1$. The simulated result explains the experimental observation and provides a basis for optimizing the dye solution flow rate for high PRR pumping.

© 2015 Optical Society of America

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