Shrinkage control in a photopolymerizable hybrid solgel material for holographic recording

Ramos, G.; Álvarez-Herrero, Alberto; Belenguer, T.; Monte, Francisco del; Lévy, David

doi:10.1364/ao.43.004018

Cited by 39 publications

(30 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To observe the effects of the species diffusion clearly, we studied surface gratings with a spatial period of 0.168 mm. Shrinkage and swelling in photopolymers have been discussed by many authors [14][15][16][17][18]. It is well known that shrinkage occurs when monomer molecules begin to link forming chains of polymer, compacting the layer and decreasing the holes size.…”

Section: Reflection Analysismentioning

confidence: 99%

In dark analysis of PVA/AA materials at very low spatial frequencies: phase modulation evolution and diffusion estimation

et al. 2009

View full text Add to dashboard Cite

Molecular diffusion effects have been widely studied inside photopolymers for holographic applications. Recently some works have focused on low spatial frequencies to evaluate in real time the monomer diffusion effects. Assuming a Fermi-Dirac function-based profile, we have fitted the diffracted intensities, reflected and transmitted (up to the 8th order), to obtain the phase and surface profile of the recorded gratings. We have studied the influence of diffusion in polyvinyl-alcohol/acrylamide for the range of spatial frequencies between 2 lines/mm and 6 lines/mm. We have demonstrated the influence of the spatial frequency on the magnitude and sign of the material volume variations. We also studied in dark the evolution of the grating shape. We show that it is possible to achieve diffractive gratings with diffraction efficiency in the first order near 35% if the in dark evolution is taken into account. Furthermore we present a method to calculate the monomer diffusivity in photopolymers. The differential equation is deduced and solved, and experimental average value is obtained (D=1.1·10 −8 cm 2 s −1 ).

show abstract

Section: Reflection Analysismentioning

confidence: 99%

In dark analysis of PVA/AA materials at very low spatial frequencies: phase modulation evolution and diffusion estimation

et al. 2009

View full text Add to dashboard Cite

show abstract

“…The first deals with advanced material compositions [16,[21][22][23], including the incorporation of inorganic substances [10,24]. The second possibility is to apply special material processing, such as pre-imaging, incoherent-light exposure [25,26].…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Analysis of Bragg Selectivity

Sabel¹

2015

Applied Sciences

View full text Add to dashboard Cite

This paper targets an inherent control of optical shrinkage in photosensitive polymers, contributing by means of spatially resolved analysis of volume holographic phase gratings. Point by point scanning of the local material response to the Gaussian intensity distribution of the recording beams is accomplished. Derived information on the local grating period and grating slant is evaluated by mapping of optical shrinkage in the lateral plane as well as through the depth of the layer. The influence of recording intensity, exposure duration and the material viscosity on the Bragg selectivity is investigated.

show abstract

“…In particular volumetric deformations may cause a Bragg angle detuning by means of altered grating constants with the result of a disturbed selectivity and optical functionality. [12] As a consequence, many efforts are made to reduce shrinkage as an undesired side effect in terms of advanced material compositions, [9,13,14] special material processing [15] or by means of incorporation of inorganic substances. [16,17] Cationic ring-opening polymerization (CROP) systems show some advantages compared with the freeradically polymerizing materials.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Bragg Angle Shift in the Course of Volume Hologram Formation

Sabel

Zschocher²

2013

Materials Research Letters

View full text Add to dashboard Cite

Real-time investigation of Bragg angle shift during volume hologram formation is presented in an organic cationic ring-opening polymerization material. Positive as well as negative values of optical shrinkage are found, assumedly related to mechanical deformations of the volume and a change of the average refractive index, respectively. Ruled by the interplay of polymerization and diffusion, the originate grating formation mechanisms prove to represent competing effects regarding the contribution to the optical shrinkage. The influence of sample preparation and holographic exposure procedure on the effects observed is investigated and the usability for minimization of total Bragg resonance detuning is considered.

show abstract

Shrinkage control in a photopolymerizable hybrid solgel material for holographic recording

Cited by 39 publications

References 14 publications

In dark analysis of PVA/AA materials at very low spatial frequencies: phase modulation evolution and diffusion estimation

In dark analysis of PVA/AA materials at very low spatial frequencies: phase modulation evolution and diffusion estimation

Spatially Resolved Analysis of Bragg Selectivity

Dynamic Bragg Angle Shift in the Course of Volume Hologram Formation

Contact Info

Product

Resources

About