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We report numerical analyses of Bragg diffraction by Denisyuk reflection holograms recorded by a high-energy pulsed laser. An intensity threshold must be passed to pattern a multilayer reflection and transmission hologram, which exhibits a nonlinear fringe structure. Numerical evaluations are provided for the laser light intensity, readout diffraction offset angle, transmission of the layer, and thickness of the polymer matrix during hologram recording. A non-sinusoidal surface pattern is formed at the top of the multilayer structure, and its effect on the diffraction properties of the structure becomes significant when the recording tilt angle is increased. Experimental results show that the angle of the diffracted light increases nonlinearly according to the tilt geometry in grating formation.
Ali K. Yetisen,Yunuen Montelongo, Nicholas M. Farandos, Izabela Naydenova, Christopher R. Lowe, Seok Hyun Yun, (2014) Mechanism of multiple grating formation in high-energy recording of holographic sensors”, Applied Physics Letters 105, 261106 (2014). doi:10.1063/1.4905352