Dissipation Loss of Mid-Infrared Radiation in a Dielectric Waveguide

Dissipation loss of electromagnetic radiation with wavelengths of 20-55 mu m was theoretically studied in a three-layer planar dielectric insulating waveguide combined with a heterolaser. It was shown that the dependence of the loss on the waveguide layer thickness behaves differently for different wavelengths in the range of 20-55 mu m. The lowest loss (several inverse centimeters) is characteristic of radiation with wave-length. lambda = 20 mu m. The losses increase with the wavelength and reach a value of 150 cm(-1) at lambda = 40 mu m, which is almost independent of the waveguide layer thickness. For electromagnetic radiation with lambda = 50 and 55 mu m, a sharp (hundreds of times) decrease in the loss with an increase in the waveguide layer thickness is observed.