Moisture resistant and anti-reflection optical coatings produced by plasma polymerization of organic compoundsThe need for protective coatings on critical optical surfaces, such as halide crystal windows or lenses used in spectroscopy, has long been recognized. It has been demonstrated that thin, one micron, organic coatings produced by polymerization of flourinated monomers in low temperature gas discharge (plasma) exhibit very high degrees of moisture resistence, e.g., hundreds of hours protection for cesium iodide vs. minutes before degradation sets in for untreated surfaces. The index of refraction of these coatings is intermediate between that of the halide substrate and air, a condition for anti-reflection, another desirable property of optical coatings. Thus, the organic coatings not only offer protection, but improved transmittance as well. The polymer coating is non-absorbing over the range 0.4 to 40 microns with an exception at 8.0 microns, the expected absorption for C-F bonds.
Document ID
19760041081
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Hollahan, J. R. (Tegal Corp. Richmond, Calif., United States)
Wydeven, T. (NASA Ames Research Center Moffett Field, Calif., United States)