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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

L'autofocalisation infrarouge dans le semi-conducteur InP:Fe
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Modelling and simulation of the growth of polymer micro-elements at the end of an optical fiber
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Model and simulation of the build-up of polymer micro-optical components on top of a fiber end
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Photorefractive optical limiting
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Photorefractive self-focusing in pulsed and continuous regime in SBN: application to Optical Limiting
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Etude de l'autofocalisation transitoire dans le semiconducteur photoréfractif InP :Fe aux longueurs d'onde des télécommunications
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Etude de l'auto-focalisation transitoire dans le semi-conducteur photoréfractif InP:Fe aux longueurs d'onde des télécommunications
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Fast self-induced waveguides ine photorefractive semi-conductor InP:Fe for reconfigurable optical swiching
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Time Resolved Applied Electric Field Masking in Photorefractive Semiconductors

We propose a theoretical analysis of the temporal self-focusing phenomena in the iron-doped indium phosphide (InP: Fe) semiconductor for low irradiations with continuous laser beams at infrared wavelengths for optical telecommunication applications such as optical switching and optical routing. Numerical models using two different methods based on charge transport equations are developed. The first method uses the classical finite differences scheme whereas the second method uses a novel algorithm based on Cellular Automata. Owing to the complexity of the non-linear differential system to be solved, full results are not retrieved but promising preliminary results are obtained and reviewed in this paper: they allow us to foresee that self-focusing on the millisecond time scale is possible in InP: Fe.
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Spatio-temporal numerical resolution of Kukhtarev equation In InP:Fe photorefractif semiconductor
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Theoretical and Experimental Temporal Self-Focusing Studies in Photorefractive InP:Fe at Telecommunication Wavelengths
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Photorefractive transient self focusing in semiconductor InP:Fe at telecommunications wavelengths
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Time resolved applied field masking inphotorefractive semiconductor
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Modelling the growth of a polymer micro-tip on an optical fiber end

Manufacturing end-of-fiber optical components able to realize optical functions ranging from a simple lens to more complex functions such as mode selective components is a decisive but \emph{a priori} complex task owing to the fiber core dimensions. Effective low cost methods allowing to grow polymer components by free-radical photopolymerization using the light coming out of the fiber have recently been reported. A novel phenomenological model of the photopolymerization process underlying is here given and used to simulate the polymer component growth in a three dimensional time-resolved manner. The simulations results are thus used to understand and optimize the component growth conditions, focusing particularly on the role of oxygen either present in the atmosphere or dissolved in the solution.
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Time resolved numerical simulation of a single laser beam in a photorefractive semi-conductor for telecommunications applications
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Fast self-induced waveguides in photorefractive semiconductor InP:Fe for reconfigurable optical switching

This paper presents a theoretical and experimental investigation of the self-focusing of a single infrared laser beam in the photorefractive semi-conductor InP : Fe for applications in the telecommunications wavelengths as reconfigurable optical switching. The temporal response of two-wave-mixing in photorefractive InP:Fe under a dc electric field at different temperatures has been studied showing that the temperature as well as the intensity can be used to tune the photorefractive response time. In that way, we analyze both experimentally and theoretically the space-charge field build-up with respect to time and space and provide strong hints on the short time self-focusing of an infrared laser beam in InP:Fe with time response in the range of the microseconds.
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Temporal behavior of two-wave-mixing in photorefractive InP:Fe versus temperature

The temporal response of two-wave-mixing in photorefractive InP:Fe under a dc electric field at different temperatures has been studied. In particular, the temperature dependence of the characteristic time constant has been studied both theoretically and experimentally, showing a strongly decreasing time constant with increasing temperature.
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Fast photorefractive self-focusing in semiconductors

Photorefractive (PR) spatial soliton propagation hints that all optical routing can be achieved through soliton interactions. This requires, however, fast build up and sensitivity to telecommunication wavelengths. We have investigated the build up of infrared (1,06m) photorefractive solitons in iron doped indium phosphide (InP:Fe) and shown that PR self focusing occurs at input powers of hundreds of W and intensities in the range of W/cm2, showing a build up time down to the microsecond.
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Photorefractive self-focusing in near IR for telecommunications
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Nicolas Fressengeas
@fresseng  ·  activity timestamp 10 years ago

Photorefractive self focusing in near IR for optical communications
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