Objetivo - To develop a generic family of spatial light modulators (SLM), based on the concept of electroholography (EH). The SLMs will be constructed of paraelectric photorefractive crystals, in particular potassium lithium tantalate niobate (KLTN). The SLMs are tailored to be used in holographic memory systems, and conoscopic holography metric systems.Expected Outcome- The project is expected to assess the potential of electroholography as an approach for constructing SLMs for optical computing applications. Results- Growth and characterisation of KLTN crystals operating at room temperature with very high diffraction efficiency, crystals with photorefrective sensitivity at 690 nm, and the development of fixing processes in these crystals. - Construction of the first EH pixels using the KLTN crystals.- Growth of doped KLTN crystal that are suitable for the EH SLMs A crystal growth system was designed and built. The system that implements the "top seeded solution growth" method has been completed and was used so far to grow approximately 32 crystals. These first samples were used primarily to investigate the photorefractive (PR) effect in KLTN crystals, in particular the voltage controlled PR effect and the fixing processes, both of paramount importance for the SLMs. Finally, a new KLTN sample was grown with high photorefractive sensitivity at 690 nm.- Construction of EH SLM prototypes The group in Jerusalem tested a new architecture for an SLM based on paraelectric photorefractive crystals - the electroholographic SLM that is based on the voltage controlled PR effect in paraelectric PR crystals. In addition, initial efforts to realise the Fabry-Perot SLM were launched. Construction of the basic EH pixel.- Incorporation of the SLM prototypes in holographic systems The French group at Orsay devoted its efforts to the development of a generic method for phase multiplexing volume holograms that will enable real time updating and refresh of the stored information, and will eventually serve as a test ground for the SLMs. Programa(s) IC-ISC C - Activity (Euratom, EEC) on cooperation in science and technology, 1984- Tema(s) Data not available Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador Centre National de la Recherche Scientifique Aportación de la UE Sin datos Dirección 91403 Orsay Francia Ver en el mapa Coste total Sin datos
