TY - GEN
T1 - Real-time holographic recording in dichromated polyvinyl alcohol films
T2 - Fifth International Symposium on Display Holography
AU - Barikani, Mehdi
AU - Simova, Eli S.
AU - Kavehrad, Mohsen
PY - 1995
Y1 - 1995
N2 - In this work, we present a study on the effect of four external electron donors in the formulation of dichromated polyvinyl alcohol (DC-PVA) films on the photosensitivity and real-time diffraction efficiency of volume holographic transmission gratings. The studied amines were found to have a detrimental effect on both holographic characteristics, even in small concentration. We found that higher relative humidity significantly improves the photospeed and the diffracted efficiency in DC-PVA films with and without an electron donor in almost all cases. The effect of the environmental humidity on the real-time diffraction efficiency in DC-PVA films with and without electron donors has been studied. Measurements of holographic characteristics are discussed. The photochemical recording mechanism in DC- PVA in the presence of external electron donors is briefly discussed as well. The amines may form a strong chelate ring structure with the chromium ions and, possibly, interfere with the crosslinking action of the photoreduced chromium. Crosslinking of the PVA matrix may occur either by PVA radicals or complexation of PVA with chromium. In both cases, hologram formation includes an electron transfer reaction, and the amines, good electron donors hinder the process by making chelate with the chromium.
AB - In this work, we present a study on the effect of four external electron donors in the formulation of dichromated polyvinyl alcohol (DC-PVA) films on the photosensitivity and real-time diffraction efficiency of volume holographic transmission gratings. The studied amines were found to have a detrimental effect on both holographic characteristics, even in small concentration. We found that higher relative humidity significantly improves the photospeed and the diffracted efficiency in DC-PVA films with and without an electron donor in almost all cases. The effect of the environmental humidity on the real-time diffraction efficiency in DC-PVA films with and without electron donors has been studied. Measurements of holographic characteristics are discussed. The photochemical recording mechanism in DC- PVA in the presence of external electron donors is briefly discussed as well. The amines may form a strong chelate ring structure with the chromium ions and, possibly, interfere with the crosslinking action of the photoreduced chromium. Crosslinking of the PVA matrix may occur either by PVA radicals or complexation of PVA with chromium. In both cases, hologram formation includes an electron transfer reaction, and the amines, good electron donors hinder the process by making chelate with the chromium.
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M3 - Conference contribution
AN - SCOPUS:0029234458
SN - 0819416665
SN - 9780819416667
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 71
EP - 78
BT - Proceedings of SPIE - The International Society for Optical Engineering
A2 - Jeong, Tung H.
Y2 - 18 July 1994 through 22 July 1994
ER -