Efficient and stable holographic gratings stored in an environmentally friendly photopolymer

Marta Morales-Vidal, Manuel G. Ramírez, Daniel Sirvent, Francisco J. Martínez-Guardiola, Mariela L. Álvarez, Inmaculada Pascual, Manuel Filipe P. Martins Costa
2019 Fourth International Conference on Applications of Optics and Photonics  
Holographic gratings stored in low-toxicity photopolymer, Biophotopol, have been analyzed to achieve stable and efficient holograms. A curing process allows the hologram stabilization, but at the same time, it could produce a diffraction efficiency (DE) reduction. Here, a detailed low-cost LED curing protocol is shown to stabilize over time 1205 l/mm transmission holograms, and at the same time, a 33% DE increment (with respect non-curing holograms) have been demonstrated. Finally, to obtain a
more » ... nally, to obtain a better understanding of DE change, a theoretical fit of our experimental result, based on Kogelnik's coupled wave theory was carried out and discussed.
doi:10.1117/12.2530574 fatcat:nv24qhponvgtrf2j5cmrxnynp4