Abstract

A photorefractive effect in terbium gallium garnet with refractive index changes up to Δn = 5 × 10 −8 for elementary volume phase holograms is reported. The light-induced refractive index changes can directly be attributed via Kramers-Kronig relations to the observed photochromic and light-induced, linear dichroitic behavior. This can also explain the possibility of writing holograms with orthogonally polarized beams.

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