The thermal conductivities of nine different synthetic garnet laser crystals at various temperatures,
range from 273 to 393 K have been investigated by instantaneous measurement method. The results
show that the thermal conductivity of each crystal decreases exponentially with the temperature
increasing. It is notable that, different host crystals, such as YAG, GGG, and GSGG have different
thermal conductivity, which is attributed to the crucial influence of crystal structure and composition on
the absolute value of their thermal conductivity. Moreover, with respect to the same host crystals, the
impurity scattering also results in the change of their thermal conductivities. This is because that a
higher concentration of doped ions leads to a more phonon scattering modes, which results in a shorter
mean free path of the phonons and a lower thermal conductivity. In addition, different host crystals have
various dependences of thermal conductivity on dopant concentration. This works provides reliable and
useful information for designing high power, high quality, and high stability laser devices.
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