Abstract
Absorption in the 8-12 μm spectral region in diamond films is dominated by single phonon effects due to departures from perfect crystallinity in the deposits. Conditions which maximize crystalline perfection must therefore be chosen to deposit diamond having the highest infrared (IR) transparency. Diamond having promising IR transmission has been deposited by both the hot filament and microwave plasma techniques. Quantitative measurement of IR absorption in polycrystalline diamond requires improvements in surface preparation techniques to reduce scatter and an understanding of the magnitude of surface absorption effects.
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