Abstract
Double-layer interference calculations are used to show that the frost-preventing properties of insulating beryllium oxide can be improved. An underlying substrate of cubic boron nitride, which has a short-wavelength reststrahlen band, will reduce the thermal radiation leak of beryllium oxide in the 8–9.5 interval. The interference calculations for these highly dispersive and partly absorbing materials demonstrate that the configuration with beryllium oxide as an outer layer is essential for the performance. Less than 20% average emittance and 11 W/m2 irradiance in the 8–13-μm window is predicted when an optimum thickness of 2.5-μm beryllium oxide upon cubic boron nitride is used.
© 1993 Optical Society of America
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