Angular responses of the first and second diffracted orders in transmission diffraction grating recorded on photopolymer material

Neipp, Cristian; Gallego, Sergi; Ortuño, Manuel; Pascual, Inmaculada; Sheridan, John T.

doi:10.1364/oe.11.001835

Cited by 50 publications

(44 citation statements)

References 19 publications

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“…Acrylamide based photopolymers are one of the most studied holographic recording materials. Shrinkage occurring during holographic recording in an acrylamide-based photopolymer [1] has been determined using real time holographic interferometry [2] and by measuring the shift in the angular position of the Bragg peak of a holographically recorded diffraction grating [3][4][5][6]. The measurements are typically made of the diffraction efficiency at a single point of the recorded holographic grating.…”

Section: Introductionmentioning

confidence: 99%

Application of phase shifting electronic speckle pattern interferometry in studies of photoinduced shrinkage of photopolymer layers

Moothanchery¹,

Bavigadda²,

Pramanik³

et al. 2017

Opt. Express

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Photoinduced shrinkage occurring in photopolymer layers during holographic recording was determined by Phase Shifting Electronic Speckle Pattern Interferometry. Phase maps were calculated from the changes in intensity at each pixel due to the phase differences introduced between object and reference beams. Shrinkage was then obtained from the changes in phase as recording proceeded. The technique allows for whole field measurement of the dimensional changes in photopolymers during holographic recording.

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Section: Introductionmentioning

confidence: 99%

Application of phase shifting electronic speckle pattern interferometry in studies of photoinduced shrinkage of photopolymer layers

Moothanchery¹,

Bavigadda²,

Pramanik³

et al. 2017

Opt. Express

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“…It is a mixture of 4-cyanobiphenyls with alkyl chains of different lengths. It has an ordinary refractive index n0 = 1.5270, and a difference between extraordinary and ordinary index Δn = 0.2670 [26]. There is a difference of 0.037 between the ordinary refractive index of the liquid crystal and that of the monomer.…”

Section: Pva (% W/v) Aona (M) Tea (M) Prf (M)mentioning

confidence: 99%

Shrinkage measurement for holographic recording materials

et al. 2017

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There is an increasing demand for new holographic recording materials. One of them are photopolymers, which are becoming a classic media in this field. Their versatility is well known and new possibilities are being created by including new components, such as nanoparticles or dispersed liquid crystal molecules in classical formulations, making them interesting for additional applications in which the thin film preparation and the structural modification have a fundamental importance. Prior to obtaining a wide commercialization of displays based on photopolymers, one of the key aspects is to achieve a complete characterization of them. In this sense, one of the main parameters to estimate and control is the shrinkage of these materials. The volume variations change the angular response of the hologram in two aspects, the angular selectivity and the maximum diffraction efficiency. One criteria for the recording material to be used in a holographic data storage application is the shrinkage, maximum of 0.5%. Along this work, we compare two different methods to measure the holographic recording material shrinkage. The first one is measuring the angle of propagation for both diffracted orders ±1 when slanted gratings are recorded, so that an accurate value of the grating vector can be calculated. The second one is based on interference measurements at zero spatial frequency limit. We calculate the shrinkage for three different photopolymers: a polyvinyl alcohol acrylamide (PVA/AA) based photopolymer, one of the greenest photopolymers whose patent belongs to the Alicante University called Biophotopol and on the last place a holographic-dispersed liquid crystal photopolymer (H-PDLC)..

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“…It is common in holography to express the profile recorded in the grating in terms of the refractive index. For this study we assume that a refractive index profile stored in the layer n(z) has the form [25]: n can be disregarded [25]. Therefore they do not affect the values of the higher harmonics in the diffraction efficiency around the first Bragg angle.…”

Section: Theoretical Analysismentioning

confidence: 99%

3-dimensional analysis of holographic memories based on photopolymers using finite differences method

Gallego¹,

Ortuño²,

Neipp³

et al. 2006

SPIE Proceedings

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The characterization of the behavior of photopolymers is an important fact in order to control the holographic memories based on photopolymers. In recent years many 2-dimensional models have been proposed for the analysis of photopolymers. These models suppose that the photopolymer layer is homogeneous in depth and good agreement between theoretical simulations and experimental results has been obtained for layers thinner than 200 µm. The attenuation of the light inside the material by Beer's law is an important factor when higher thickness are considered. In this work we use a Finite-Difference method to solve the 3 dimensional problem. Now diffusion in depth direction and the attenuation of the light inside the material by Beer's law are also considered, the influence of the diffusivity of material in the attenuation of the refractive index profile in depth is analyzed.

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Angular responses of the first and second diffracted orders in transmission diffraction grating recorded on photopolymer material

Cited by 50 publications

References 19 publications

Application of phase shifting electronic speckle pattern interferometry in studies of photoinduced shrinkage of photopolymer layers

Application of phase shifting electronic speckle pattern interferometry in studies of photoinduced shrinkage of photopolymer layers

Shrinkage measurement for holographic recording materials

3-dimensional analysis of holographic memories based on photopolymers using finite differences method

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