Abstract
The effect of Ru + Mn co-doping on the light-induced properties ofBi4Ge3O12 (BGO)crystals is studied and compared with single Ru- and Mn-doped crystals. Optical absorption spectraof Ru + Mn co-doped crystal demonstrates a photosensitivity shift to the visible spectralrange. In addition, a strong photochromic effect, being fully reversible bythermal annealing is observed. It is verified by photoluminescence emission thatcharge traps could be manipulated under ultraviolet (UV) excitation, as thephotoluminescence intensity decreases revealing the existence of the state filling effect.Ru + Mn doping leads to a faster response time during holographic recording at 633 nm and aprolonged read-out process, especially after a preliminary exposure to UV light.The ability to modify the defect structure and corresponding absorption bandssuggests the future potential for optical fixing using a two-step sensitization method.
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