Very thick holographic nonspatial filtering of laser beams

Multidimensional tomographic imaging using volume holography

“…In Appendix III we show that (82) where, for (83) In the space domain, the above expression can be rewritten as (84) Expressions (83) and (84) are the key results of this section: they express the modal structure of the diffracted field as a mixture of the coherence modes of the source and the modes of the volume hologram [note that the modes in (83) or (84) are not orthogonal but can be orthonormalized in straightforward fashion with a Gramm-Schmidt procedure]. The mixing occurs primarily through the coupling constants i.e., the Fourier components of the refractive index modulation, while the modes of the hologram itself act as weighting functions.…”

Near field angular filtering with volume Bragg gratings in photothermorefractive glass

“…Volume Bragg Gratings (TBGs) have been widely applied in numerous advanced laser technology owing to high efficiency, angular and spectral selectivity. In the 1990s, the volume Bragg gratings recorded in different photosensitive materials was reported by many research institutions abroad, which finished the "non-focused spatial filtering" (Non-Spatial filtering) [9][10][11][12][13]. They used a divergent beam to demonstrate the angular selectivity of thick Bragg gratings.…”

Light-Sensitive Media-Composites for Recording Volume Holograms Based on Porous Glass and Polymer

“…The interest to static volume holograms with thickness of several millimeters is due, mainly, to their use in research and in creation of holographic optical elements (HOE) of various purposes with unique parameters (Sukhanov et al, 1984;Ludman at al., 1997;Popov, et al, 2000;Luo, at al., 2008). Requirements to materials for recording of such holograms are rather specific and cannot be met when using traditional light-sensitive materials.…”