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Bencheikh K.,CNRS Laboratory for Photonics and Nanostructures | Richard S.,Horiba Jobin Yvon Inc. | Melin G.,PRYSMIAN DRAKA COMTEQ | Krabshuis G.,PRYSMIAN DRAKA COMTEQ Fibre B.V. | And 2 more authors.
Optics Letters | Year: 2012

Phase-matched third-harmonic generation is demonstrated in a germanium-doped optical fiber. Green light at 514.4 nm is generated in an LP03 mode when a pump field at ~1543.3 nm is launched into the fiber in the fundamental LP01 mode. The phase matching is achieved for a particular combination of the germanium doping concentration and the fiber core diameter. © 2012 Optical Society of America.

Richard S.,Horiba Jobin Yvon Inc. | Bencheikh K.,CNRS Laboratory for Photonics and Nanostructures | Boulanger B.,CNRS Neel Institute | Levenson J.A.,CNRS Laboratory for Photonics and Nanostructures
Optics Letters | Year: 2011

In this Letter we study spontaneous generation of triple photon states in optical fibers by third order spontaneous downconversion. Using a semiclassical approach we derive an explicit expression for the triple photons generation efficiency as a function of fiber parameters. We show that optical fibers with well suited index profiles and standard outer diameters could be the key component of future triple photons sources. © 2011 Optical Society of America.

Dumke J.C.,Louisiana State University | El-Zahab B.,Louisiana State University | Challa S.,Louisiana State University | Das S.,Louisiana State University | And 4 more authors.
Langmuir | Year: 2010

Lanthanide photochemistry has been frequently studied for its high luminescence intensity, narrow emission band, and stable luminescent lifetime decay. In the work presented here, nanoparticles prepared using an aerosolization process were derived from europium-based GUMBOS (Group of Uniform Material Based on Organic Salts). These nanoparticles were characterized using electron microscopy, X-ray photoelectron spectroscopy (XPS), absorbance, and photoluminescence spectroscopy. An average diameter of 39.5 ( 8.4 nm for our nanoparticles was estimated by use of electron microscopy. Absorbance, luminescence, and luminescence lifetime decay measurements indicate intense and steady luminescence, which suggests a multitude of possible applications for lanthanide-based GUMBOS, especially in sensory devices, OLEDs, and photovoltaic devices. © 2010 American Chemical Society.

Thiaville A.,University Paris - Sud | Vukadinovic N.,Dassault Aviation | Acher O.,French Atomic Energy Commission | Acher O.,Horiba Jobin Yvon Inc.
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

The f-sum rule for the magnetic permeability, derived previously for an assembly of isolated macrospins, is generalized for an arbitrary nonuniform three-dimensional magnetization texture, in which the magnetizations at different points are coupled by exchange and magnetostatic interactions. The sum value depends only on the magnetic texture at rest. It has no direct contribution from the exchange energy, but depends on the anisotropy, applied field, and demagnetizing energies. The derived formula is tested against numerical calculations for several complex and very different magnetization structures. This generalized sum rule should be useful for experiments, numerical simulations, and metrology. © 2012 American Physical Society.

Adar F.,Horiba Jobin Yvon Inc.
Spectroscopy (Santa Monica) | Year: 2012

Raman spectra of spin-oriented and drawn fibers were band-fitted to illustrate how this spectral treatment can unravel correlations between molecular conformers and sample history. Care must be taken to avoid over-fitting spectra; there should be chemical or physical reasons for introducing bands to improve the overall fit. © 2012 Advanstar Communications, Inc. All rights reserved.

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