Publications by authors named "Bertrand Ménaert"

13 Publications

  • Page 1 of 1

Dielectric frame, Sellmeier equations, and phase-matching properties of the monoclinic acentric crystal GdCa4O(BO3)3.

Opt Lett 2016 Nov;41(22):5290-5293

We directly measured the phase-matching properties of the biaxial GdCa4O(BO3)3 (GdCOB) crystal using the sphere method. We studied second-harmonic generation and difference frequency generation in two principal planes of the crystal. All these data allowed us to refine the Sellmeier equations of the three principal refractive indices. These equations are valid over the entire transparency range of GdCOB and then could be used to calculate the tuning curves of infrared optical parametric generation.
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http://dx.doi.org/10.1364/OL.41.005290DOI Listing
November 2016

Phase-matching directions and refined Sellmeier equations of the monoclinic acentric crystal BaGa4Se7.

Opt Lett 2016 Jun;41(12):2731-4

We directly measured the phase-matching directions of second-harmonic and difference frequency generation in the principal planes of the biaxial BaGa4Se7 (BGSe) crystal using the sphere method. The simultaneous fit of the data allowed us to refine the Sellmeier equations of the three principal refractive indices of BGSe, and to calculate the tuning curves for infrared optical parametric generation.
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http://dx.doi.org/10.1364/OL.41.002731DOI Listing
June 2016

Phase-matching directions, refined Sellmeier equations, and second-order nonlinear coefficient of the infrared Langatate crystal La₃Ga(5.5)Ta(0.5)O₁₄.

Opt Lett 2014 Jul;39(13):4033-6

We directly measured phase-matching directions of second harmonic, sum, and difference frequency generations in the Langatate La₃Ga(5.5)Ta(0.5)O₁₄ (LGT) uniaxial crystal. The simultaneous fit of the data enabled us to refine the Sellmeier equations of the ordinary and extraordinary principal refractive indices over the entire transparency range of the crystal, and to calculate the phase-matching curves and efficiencies of LGT for infrared optical parametric generation.
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http://dx.doi.org/10.1364/OL.39.004033DOI Listing
July 2014

High-temperature elastic moduli of flux-grown α-GeO2 single crystal.

Chemphyschem 2014 Jan 2;15(1):118-25. Epub 2013 Dec 2.

Institut Charles Gerhardt Montpellier, UMR 5253, CNRS-UM2-ENSCM-UM1, C2M, Université Montpellier 2, CC 1504, Place Eugène Bataillon, 34095 Montpellier Cédex 5 (France), Fax: (+33) 467144290.

From high-precision Brillouin spectroscopy measurements, six elastic constants (C11, C33, C44, C66, C12, and C14) of a flux-grown GeO2 single crystal with the α-quartz-like structure are obtained in the 298-1273 K temperature range. High-temperature powder X-ray diffraction data is collected to determine the temperature dependence of the lattice parameters and the volume thermal expansion coefficients. The temperature dependence of the mass density, ρ, is evaluated and used to estimate the thermal dependence of its refractive indices (ordinary and extraordinary), according to the Lorentz-Lorenz equation. The extraction of the ambient piezoelectric stress contribution, e11, from the C'11-C11 difference gives, for the piezoelectric strain coefficient d11 , a value of 5.7(2) pC N(-1), which is more than twice that of α-quartz. As the quartz structure of α-GeO2 remains stable until melting, piezoelectric activity is observed until 1273 K.
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http://dx.doi.org/10.1002/cphc.201300793DOI Listing
January 2014

Vibrational origin of the thermal stability in the highly distorted α-quartz-type material GeO2: an experimental and theoretical study.

Inorg Chem 2013 Jun 4;52(12):7271-9. Epub 2013 Jun 4.

Institut Charles Gerhardt Montpellier (ICGM), UMR 5253 CNRS-UM2-ENSCM-UM1, équipe C2M, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier cedex 5, France.

We report an experimental and theoretical vibrational study of the high-performance piezoelectric GeO2 material. Polarized and variable-temperature Raman spectroscopic measurements on high-quality, water-free, flux-grown α-quartz GeO2 single crystals combined with state-of-the-art first-principles calculations allow the controversies on the mode symmetry assignment to be solved, the nature of the vibrations to be described in detail, and the origin of the high thermal stability of this material to be explained. The low-degree of dynamic disorder at high-temperature, which makes α-GeO2 one of the most promising piezoelectric materials for extreme temperature applications, is found to originate from the absence of a libration mode of the GeO4 tetrahedra.
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http://dx.doi.org/10.1021/ic4009416DOI Listing
June 2013

Widely tunable optical parametric oscillator in a 5 mm thick 5% MgO:PPLN partial cylinder.

Opt Lett 2013 Mar;38(6):860-2

Institut Néel Centre National de la Recherche Scientifique-Université Joseph Fourier, Grenoble, France.

A 5 mm thick and 38 mm long 5% MgO-doped periodically poled lithium niobate (MgO:PPLN) cylinder with a grating period of 28 μm has been engineered as a partial cylinder with an angular aperture of 45°. An optical parametric oscillator based on this crystal and pumped at 1.064 μm is reported. The output energy is comparable to that generated in the same kind of sample cut as a slab, but the wavelength tunability from 1.41 to 4.3 μm is much broader and continuous.
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http://dx.doi.org/10.1364/OL.38.000860DOI Listing
March 2013

Phase-matching properties and refined Sellmeier equations of the new nonlinear infrared crystal CdSiP2.

Opt Lett 2011 May;36(10):1800-2

Institut Néel Centre National de la Recherche Scientifique - Université Joseph Fourier, 25 Rue des Martyrs, BP 166, F38402 Grenoble Cedex 9, France.

We directly measured the second harmonic generation and difference frequency generation phase-matching directions of the nonlinear crystal CdSiP(2) until 9.5 μm using the sphere method. The simultaneous fit of the experimental angular data allowed the Sellmeier equations of the ordinary and extraordinary principal refractive indices to be refined over the entire transparency range of the crystal.
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http://dx.doi.org/10.1364/OL.36.001800DOI Listing
May 2011

Rotation of the absorption frame as a function of the electronic transition in the Nd3+:YCa₄O(BO₃)₃ monoclinic crystal.

Opt Express 2010 Aug;18(18):19169-74

Institut Néel CNRS/UJF, 25 rue des Martyrs, BP 166, F38402 Grenoble Cedex 9, France.

We report the first measurements of the angular distribution of absorption under polarized light corresponding to seven electronic transitions of Nd(3+) ions in the monoclinic crystal Nd:YCOB, revealing a rotation of the symmetry axes of the different patterns.
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http://dx.doi.org/10.1364/OE.18.019169DOI Listing
August 2010

Brillouin spectroscopy, calculated elastic and bond properties of GaAsO4.

Inorg Chem 2010 Oct;49(20):9470-8

Institut Charles Gerhardt Montpellier, UMR-CNRS-UM2-ENSCM-UM1 5253, Université Montpellier 2, Equipe C2M, Place E. Bataillon, 34095 Montpellier, Cedex 5, France.

Experimental and theoretical studies have been performed to demonstrate the high performance of the novel piezoelectric material GaAsO(4). Hydrothermally grown single crystals of α-quartz phase GaAsO(4) were studied by Brillouin spectroscopy to determine elastic constants. Experimentally obtained values of C(11), C(66), C(33), C(44), C(14) and C(12) are 59.32, 19.12, 103.54, 30.70, 1.7, and 21.1 GPa, respectively. Elastic and piezoelectric tensors were also calculated by a first principles method in this work, leading to a very good agreement with experimental results and confirming the values of elastic components obtained indirectly such as C(14) and the negligible piezoelectric correction for C(11). The thermal behavior of the elastic constant corresponding to the [100] longitudinal L mode (C(11)) was studied up to 1137 K to estimate potential piezoelectric performance. It was found that the thermal behavior is linear up to 1273 K which is just below the thermal decomposition temperature of 1303 K. High thermal stability can be linked to the higher polarizability of large cations Ga and As because of neighboring oxygen atoms. On the basis of thermal behavior, GaAsO(4) is a promising material for high temperature piezoelectric applications.
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http://dx.doi.org/10.1021/ic1011499DOI Listing
October 2010

Singular topology of optical absorption in biaxial crystals.

Opt Express 2009 Oct;17(22):19868-73

Institut Néel CNRS/UJF, 25 rue des Martyrs, BP 166, F38402 Grenoble Cedex 9 France.

We show for the first time that biaxial crystals exhibit continua of directions of propagation where the absorption coefficient is the same for the two associated polarization modes. This statement is supported by both calculations and experimental data obtained in Nd:YCOB.
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http://dx.doi.org/10.1364/OE.17.019868DOI Listing
October 2009

Angular quasi-phase-matching experiments and determination of accurate Sellmeier equations for 5%MgO:PPLN.

Opt Lett 2009 Sep;34(17):2578-80

Institut Néel CNRS/UJF, 25 rue des Martyrs, BP 166, F38402 Grenoble Cedex 9, France.

We validated the theory of angular quasi-phase-matching (AQPM) by performing measurements of second-harmonic generation and difference-frequency generation. A nonlinear least-squares fitting of these experimental data led to refine the Sellmeier equations of 5%MgO:PPLN that are now valid over the complete transparency range of the crystal. We also showed that AQPM exhibits complementary spectral ranges and acceptances compared with birefringence phase matching.
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http://dx.doi.org/10.1364/OL.34.002578DOI Listing
September 2009

Absorption and fluorescence anisotropies of monoclinic crystals: the case of Nd:YCOB.

Opt Express 2008 May;16(11):7997-8002

Institut Néel CNRS/UJF, 25 rue des Martyrs, BP 166, F38402 Grenoble Cedex 9, France.

We report for the first time measurements and modelization of the angular distributions of absorption and fluorescence in a monoclinic crystal. Studies on Nd:YCOB revealed specific topologies with ombilics. These new data upgrade the knowledge on low symmetry crystal optics.
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http://dx.doi.org/10.1364/oe.16.007997DOI Listing
May 2008

Continuous tuning of a microlaser-pumped optical parametric generator by use of a cylindrical periodically poled lithium niobate crystal.

Opt Lett 2003 Jun;28(12):1028-30

Laboratoire de Spectrométrie Physique, 140 Avenue de la Physique, BP 87, 38402 Saint Martin d'Heres, France.

An optical parametric generator with a cylindrical periodically poled LiNbO3 crystal and a Nd:YAG commercial microchip pump laser yields continuous tuning of the emitted wavelengths over a broad spectral range (1.42-1.7 microm and 2.8-4.2 microm), with large efficiency, a high repetition rate, and low divergence, in a compact and stable device.
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http://dx.doi.org/10.1364/ol.28.001028DOI Listing
June 2003