1 October 1990 Potential limitations for using CVD diamond as LWIR windows
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Abstract
The infrared absorption in thin film polycrystalline diamond deposited in a microwave plasma is examined using Fourier transform infrared spectroscopy (FF-IR). The incorporation of small amounts of hydrogen during the growth process resuits in absorption in the "C-H stretch" region at 3.5 pm and 3.42 jim as well as absorption in the extrinsic defect related single-phonon region from 7jim to 12 rim. This absorption is precisely in the 8 jim to 12 jtm band where high transmittance is required by long wave infrared optical systems and therefore the amount of hydrogen incorporated during vapor phase growth of diamond could limit this materials usefulness as a bulk optical material. The effects of growth conditions and high temperature annealing on the absorption in these two IR regions are discussed. IR spectra are compared with Raman spectra and hydrogen content measured by nuclear reaction analysis.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas M. Hartnett, Richard P. Miller, "Potential limitations for using CVD diamond as LWIR windows", Proc. SPIE 1307, Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors, (1 October 1990); doi: 10.1117/12.21697; https://doi.org/10.1117/12.21697
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