Objective
The objective of this project is to demonstrate that high efficiency, low threshold current, tunable, medium power lasers can be obtained on (111)B GaAs substrates, and that these lasers can also cover the 1.0-1.3 microns range. The material system GaInAs/AlGaAs/GaAs (100) reaches its limits around 1.06-1.1 microns, due to limitations associated to the appearance of dislocations in the strained InGaAs Quantum Well (QW) (Critical Layer Thickness, CLT, limit).
The use of (111)B GaAs substrates allows to increase the critical thickness for PseudoMorphic InGaAs QW's. We plan to investigate the maximum reachable wavelength from strained InGaAs QW's grown on (111) GaAs substrates. Besides, this orientation offers a different valence band structure, that will allow to lower the lasing threshold current. High quantum efficiency is also expected because of the lower non-radiative recombination rates in this orientation. As another novelty, we plan to develop Bragg reflectors on (111)B GaAs substrates, to reduce the spontaneous radiative recombination, and thus to further lower the threshold current of such a laser diode. Another novel concept offered by (111) lasers is tunability, due to the presence of the piezoelectric field in strained quantum wells grown on polar orientations, this field being maximum for (111) orientations. The screening of the piezoelectric field can be used to adjust the wavelength by controlling the losses. We plan a practical approach to realise tunable lasers based on this principle.
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.
- natural sciences physical sciences electromagnetism and electronics optoelectronics
- natural sciences physical sciences optics laser physics
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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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
28040 MADRID
Spain
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.