Abstract
An emerging cationic photo-initiator titanocene (TI) dispersed poly (methyl methacrylate) (PMMA) photopolymer was fabricated by an optimized three-step thermo-polymerization method with excellent holographic performances. Materials with different thicknesses (1-3 mm) were prepared and characterized experimentally. The influences of material thickness changes on holographic properties have been investigated in detail. We achieved the response time of 4.98s in 1mm TI/PMMAs, while the cumulative gratings strength of 6.88 and single grating diffraction efficiency of 74% in 3 mm ones. Furthermore, gratings recorded in materials were examined with controlling experimental conditions in a green-light two-beam coupling interference system, under different polarization directions, ambient temperatures and intersection angles, respectively. A better holographic recording condition was proposed. Meanwhile, the influence on recording surroundings for TI/PMMA were analyzed. This work can provide a basis to depict the holographic storage capacity and stability in TI/PMMA polymers.
Highlights
In this work, TI/PMMA photopolymer was examined to record volume diffraction gratings by using a 532nm green-beam twowave coupling interference system
We achieved the improvement of 51% and 35% in diffraction efficiency and response time in TI/PMMA compared to PQ/PMMA photopolymer in our previous work
Grating strength and response time with different polarization directions, ambient temperatures and intersection angles were measured in 2mm TI/PMMAs, respectively
Summary
TI/PMMA photopolymer was examined to record volume diffraction gratings by using a 532nm green-beam twowave coupling interference system. We achieved the improvement of 51% and 35% in diffraction efficiency and response time in TI/PMMA compared to PQ/PMMA photopolymer in our previous work.15,20 The reason for the enhancement of holographic properties in TI/PMMA is mainly due to the higher sensitivity of TIs to green light and more photosensitive molecule amount in exposure area. We experimentally researched the diffraction efficiency, response time, Bragg angular selectivity and cumulative grating strength in TI/PMMAs under different thickness, respectively.
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