Abstract
Thermal diffusivities of pure and doped yttrium aluminum garnet single crystals were measured as a function of temperature. Samples doped with rare earth ions (3 at% and 25 at% of Yb 3+, and 0.8 at% and 2.1 at% of V 3+) were investigated in the temperature range from 34 °C to 300 °C. Determination of the thermal diffusivity was based on an analysis of propagation of a thermal wave in the sample. The frequency of the thermal wave was 100 mHz. A temperature disturbance connected with the thermal wave propagating in the sample was detected using the mirage effect. The results showed that the thermal diffusivity of all investigated samples decreases with an increase of sample temperature. A drop in the thermal diffusivity is more pronounced for pure and low-doped crystals.
Highlights
The thermal diffusivity is a very important quantity determined in dynamic thermal measurements
This article presents the results of investigations of the thermal-diffusivity dependence on temperature for pure yttrium aluminum garnet (YAG) (Y3Al5O12) single crystals and crystals doped with different concentrations of trivalent ions: Yb and V
The results of measurements carried out for pure and doped YAG single crystals revealed a significant decrease of the thermal diffusivity caused by increasing temperature from 34 ◦C to 300 ◦C
Summary
The thermal diffusivity is a very important quantity determined in dynamic thermal measurements It characterizes the speed of reaching thermal equilibrium between a sample and its surrounding. A complete characterization of selected properties of Yb:YAG single crystal and its applications was mentioned in our previous article [6]. Another popular crystal applied in nonlinear optics is YAG doped with vanadium ions. This article presents the results of investigations of the thermal-diffusivity dependence on temperature for pure YAG (Y3Al5O12) single crystals and crystals doped with different concentrations of trivalent ions: Yb and V.
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