Damage Tolerant Light Absorbing Materials

CBCF for infrared wavelength from 2 to 55 im is eompared with that of etched beryllium in Fig. 10. The data show that the CBCF is uniformly light absorbing up to at least 50 pm, in marked contrast to the etched beryllium light absorber which effectively absorbs wavelengths only up to about 20 pm. 

Etched beryllium light absorbers are somewhat more robust than Martin Black 54 but, as shown m Fig. 10, are meffective above certam wavelengths. Moreover, both beryllium and aluminum are sensitive to envuonmental degradation and may degrade thermally due to their low melting temperatures. 

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