7 December 1992 Sol-gel-derived AgCl photochromic coating on glass for holographic application
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A sol-gel derived photochromic glass coating of about 1.5 micrometers in thickness is synthesized by infiltration of Ag+ into a predried Na-Al-B-Si gel layer. The formation of small Ag colloids is initiated by a soft heat treatment and the colloids are converted by a HCl vapor treatment into AgCl crystallites of about 40 nm in diameter. The coating darkens by UV irradiation, forming Ag crystallites of about 5 nm in size. This process is completely reversible at 400 degree(s)C and no decay is observed in numerous cycles. An amplitude hologram which acts as a diffraction grating with a grating period of about 10 micrometers can be produced within this layer by a two-wave mixing experiment with laser light of 351 nm wavelength. The diffraction efficiency of this grating is determined to 0.11%. After thermal erasing the diffraction pattern can be rewritten and erased repeatedly without any loss of efficiency.
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Martin Mennig, Martin Mennig, Herbert Krug, Herbert Krug, Claudia Fink-Straube, Claudia Fink-Straube, Peter William Oliveira, Peter William Oliveira, Helmut K. Schmidt, Helmut K. Schmidt, "Sol-gel-derived AgCl photochromic coating on glass for holographic application", Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992); doi: 10.1117/12.132030; https://doi.org/10.1117/12.132030


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