This paper presents the results of an experimental investigation of the degradation of a series-produced optical coating made from lead fluoride on a substrate made from IKS-25 chalcogenide glass after the combined action of high-speed fluxes of solid microparticles (carbon-containing microparticles of size 0.1-200μm, with a speed of 0.1-30km/sec and a flux density of up to 10<sup>4</sup>cm<sup>−2</sup>sec<sup>−1</sup>), a relaxing plasma (with a concentration of atoms and ions of oxygen, carbon, hydrogen, nitrogen and their compounds of about 10<sup>14</sup>−10<sup>17</sup>cm<sup>−3</sup>, a flux density of up to 10<sup>23</sup>cm<sup>−2</sup>sec<sup>−1</sup>, and a flux speed up to 10km/sec), short-wavelength radiation (with an exposure of 0.1J/cm<sup>2</sup> in the vacuum UV region of wavelengths 90-180nm and 1.2J/cm<sup>2</sup> in the UV region with wavelengths 180-400nm) under vacuum conditions (with pumping to 10<sup>−7</sup>-10<sup>−5</sup>Torr) accompanying thermal cycling (in the temperature range −20to+160°C). An estimate is given of the possibility of using the described methods to physically model the action on optical materials of the main harmful factors in low near-earth orbits.
© 2008 Optical Society of America
E. V. Kalashnikov and S. N. Rachkulik, "Study of the combined action of high-speed flows of finely dispersed particles, plasma, and short-wavelength radiation on optical materials accompanying thermal cycling under vacuum conditions," J. Opt. Technol. 75, 819-825 (2008)