The temperature dependence of the damping coefficient alpha of a surface electromagnetic wave (SEW) on a platinum mirror has been experimentally measured. The SEW was excited by laser radiation (λ=10.6 µm) on a diffraction grating from which the first order of diffraction propagated along the surface of the mirror. In the temperature range 20-110 °C, the temperature coefficient of damping of the SEW is obtained as β=dα/dT=(18±2)10<sup>−4</sup> cm<sup>−1 </sup>°C<sup>−1</sup>. It is obtained from the data of these measurements that dA/dT=2.7×10<sup>−5</sup> °C<sup>−1</sup>, where A is the absorbance of platinum. At the same time that the SEW was excited, excitation of a volume near-surface wave (NSW) on the diffraction grating was observed, propagating from the grating at an angle of 2.5° to the surface of the mirror. It is shown that the appearance of an NSW, also called a squeezed wave, is associated with divergence of the laser radiation.

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