Determination of Thermal-Diffusivity Dependence on Temperature of YAG Single Crystals with Different Concentrations of Yb3+ and V3+ Doping Ions

作者：Trefon Radziejewska D^*; Bodzenta J; Kazmierczak Balata A; Lukasiewicz T

来源：International Journal of Thermophysics, 2012, 33(4): 707-715.

DOI：10.1007/s10765-012-1177-1

• Optical crystals
• Temperature dependence
• Thermal diffusivity
• Thermal wave measurement

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 Yb3+, and 0.8 at% and 2.1 at% of V3+) were investigated in the temperature range from 34 degrees C to 300 degrees 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 100mHz. 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.

• 出版日期2012-4