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Proceedings Paper

Potential limitations for using CVD diamond as LWIR windows
Author(s): Thomas M. Hartnett; Richard P. Miller
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Paper 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.

Paper Details

Date Published: 1 October 1990
PDF: 11 pages
Proc. SPIE 1307, Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors, (1 October 1990); doi: 10.1117/12.21697
Show Author Affiliations
Thomas M. Hartnett, Raytheon Research Div. (United States)
Richard P. Miller, Raytheon Research Div. (United States)

Published in SPIE Proceedings Vol. 1307:
Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors
Rudolf Hartmann; M. J. Soileau; Vijay K. Varadan, Editor(s)

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