Objective
On this basis the work of the first assessment phase will be given a threefold objective in order to
- explore more fully the photorefractive behaviour of vanadium-doped CdTe crystals by varying key parameters;
- demonstrate the use of such crystals in some specific applications;
- attract industrials intended to join the full-scale project as proposers or advisers.
The first part of the work programme will involve coordinated efforts on crystal growth, chemical and physical characterisation, optical measurements. The variation of a key parameter -the vanadium to compensating centres ratio- will allow one to specify the photorefractive effect related to vanadium incorporation. Wave-mixing experiments including time and temperature dependences will be carried out and interpreted using theoretical modelling and computer simulation.
In parallel typical applications will be investigated in the field of optical transmission at 1.3 - 1.55(m. This wavelength range is of particular importance for low losses optical fibre transmission and also for free space interconnection (eye-safe wavelengths). Firstly a method for determining the coherence function and emission spectra of semiconductor lasers using a two-wave mixing configuration will be demonstrated. Secondly preliminary experiments will be performed on phase conjugate mirrors as a technique for adaptive coupling of a laser beam into an optical fibre and switching from multiple sources to multiple destinations.
The second phase of the project will address more ambitious objectives:
- to specify an optimum method of crystal growth leading to device-quality photorefractive II-VI crystals covering the most useful wavelengths;
- to realise prototype components intended to be inserted in optical networks;
- to enlarge the field of applications of photorefractive crystals.
The present project is aimed at optimising the use of the optical property "Photorefractivity" in optical components, by resorting to the most appropriate materials: II-VI semiconductors. As a matter of fact II-VI semiconductors have a high figure of merit, three times higher than for III-V compounds. The use of ZnTe, CdTe and mixed alloys allows one to cover a wide spectral range including the laser wavelengths at 0.8(m 1.06(m 1.3 (m and 1.55(m.
Preliminary experiments have been conducted on CdTe bulk crystals doped with the deep impurity vanadium what makes of this system the prototype of a new generation of photorefractive mediums.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology materials engineering crystals
- natural sciences chemical sciences inorganic chemistry transition metals
- engineering and technology electrical engineering, electronic engineering, information engineering information engineering telecommunications telecommunications networks optical networks
- natural sciences physical sciences electromagnetism and electronics semiconductivity
- natural sciences physical sciences optics fibre optics
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
92195 Meudon
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.