Abstract

Photosensitive polymers based on poly-methylmethacrylat (PMMA) are well- suitable materials for holographic recording. A hologram recorded by two plane waves can acts as a spectral filter with the selectivity Δl/l = λ/t , where λ- is the grating spacing, T-is the hologram thickness. We used a PMMA polymer with a content of 10% to 20% residual monomer methyl methacrylate sensitize for UV light by (0.1 wt.%) 2,2-dimethoxy-2-phenylacetophenone (short: DMPA). The holograms were recorded at λ=351nm (Ar⁺-ion laser) in transmission geometry and reconstructed at λ=783⋯ 785 nm (tunable semiconductor laser, tuning step 2pm) in reflection geometry. The grating spacing of the recorded holograms was around 265nm. Because the thickness of the recorded holograms in reflection geometry was 10mm, they provided a high spectral selectivity (up to 20pm) and diffraction efficiency (up to 85%). The total optical loss was only 10% per 10mm, which indicates the perfect optical quality of the samples.

© 2001 EPS