Improving energetic sensitivity in holography with a new photopolymer containing a mixture of rose bengal and methylene blue

Ricardo Marin Mallavia; Antonio Fimia; Celia Garcia; Roberto Sastre

doi:10.1117/12.429475

4 June 2001 Improving energetic sensitivity in holography with a new photopolymer containing a mixture of rose bengal and methylene blue

Ricardo Marin Mallavia, Antonio Fimia, Celia Garcia, Roberto Sastre

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Proceedings Volume 4296, Practical Holography XV and Holographic Materials VII; (2001) https://doi.org/10.1117/12.429475
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

We present the results of the study as holographic recording material of aphotopolymerizable mixture of polyvinyl alcohol and acrylamide, with a photo initiator system formed by a 1:1 molar mixture of the anionic dye Rose Bengal (RB) and the cationic one Methylene Blue (MB), with triethanolamine as coinitiator. Under irradiation with 514 or 633 nm light and comparative conditions, photopolymers with this photo initiator system give rise to a clear sensitivity enhancement, with regard to the use of any of the dyes alone. Still higher enhancements were achieved using as absorbing component an isolated ion-pair from the 1:1 mixture of both dues, with some different properties than those of the physical 1:1 mixture of dyes. Maximum diffraction efficiencies of 35-64 percent with 30-100 mJ.cm^-2, and spatial resolution of ca. 1000 lines.mm^-1, could be reached. The photo initiator mechanism using either the mixture RB/MB or the isolated ion-pair RB-MB is likely based on charge-transfer processes from the excited chromophores, that seems to be favored in the case of the ion-pair.

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Ricardo Marin Mallavia, Antonio Fimia, Celia Garcia, and Roberto Sastre "Improving energetic sensitivity in holography with a new photopolymer containing a mixture of rose bengal and methylene blue", Proc. SPIE 4296, Practical Holography XV and Holographic Materials VII, (4 June 2001); https://doi.org/10.1117/12.429475

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KEYWORDS

Holography

Absorption

Diffraction

Ions

Holographic materials

Light

Dysprosium

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