Proton radiation effects on optical constants of Al film reflector |
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| Authors: | Liu Hai Wei Qiang He Shi-Yu and Zhao Dan |
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| Affiliation: | Space Materials and Environment Engineering Laboratory, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | The Al film reflectors can yield a high-reflectance over a broad wavelength
region, and have been widely used in the spacecraft optical instruments for
high quality optical applications. Under the irradiation of charged
particles in the Earth radiation belt, the reflectors could be deteriorated.
In order to reveal the deterioration mechanism, the change in optical
constants of Al film reflector induced by proton radiation with 60\,keV was
studied in an environment of vacuum with heat sink. Experimental results
showed that when the radiation damage primarily occurs in the Al reflecting
film, the extinction coefficient k will gradually decrease with increasing
radiation fluence, which results in the decrease of the energies of
reflective light. Therefore, the proton radiation induced an obvious
degradation of spectral reflectance in the wavelength region from 200 to
800\,nm on the Al film reflector. |
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| Keywords: | Al film reflector optical constants radiation damage |
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