We performed light optical diffraction experiments on a nanoparticle-polymer volume holographic grating in an angular range including also far-off-Bragg replay. A comparison of three diffraction theories -on the same level of complexity -with our experimental results shows that the dynamical theory of diffraction and the first-order two-wave coupling theory using the beta-value method fit the data very well. In contrast, the prevalent two-wave coupling theory using the K-vector closure method yields a poor fit with an order of magnitude worse mean squared error. These findings must be considered for accurate determination of coupling strength and grating thickness.
The angular dependence of the diffraction efficiency of volumetype\ud
holographic gratings recorded in a single-domain light-sensitive liquid\ud
crystalline elastomer was investigated. Usually this dependence is expected\ud
to be very similar for intensity gratings and for polarization gratings.\ud
However, our measurements resolved a profound difference between the\ud
two types of the gratings: a typical Bragg peak of the diffraction efficiency\ud
is observed only for intensity gratings, while polarization gratings exhibit a\ud
profound dip at the Bragg angle. The appearance of this dip is explained by\ud
strongly anisotropic optical absorption of the actinic light during the\ud
recording process
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