We experimentally demonstrate simultaneous phase and group velocity locking of fundamental generated second harmonic pulses in Lithium Niobate, under conditions material mismatch. In phase-mismatched, pulsed generation addition to a reflected signal two forward-propagating are also at the interface between linear order nonlinear material: first pulse results from solution homogeneous wave equation, propagates expected dispersion; is inhomogeneous phase-locked trapped by pump pulse, follows...

L’historicité, la contextualité et polysémie des notions de diversité performance expliquent l’hétérogénéité conclusions auxquelles aboutissent les études empiriques qui en testent relation. Les dimensions culturelles temporelles, le type management adopté, modes d’intégration professionnelle, conjoncture contexte intra-organisationnel influent sur équipes diversifiées. Afin transmuer levier performance, organisations sont invitées à concevoir politiques soucieuses d’inscrire changement dans...

In this Letter, the first implementation, to our knowledge, of X-junctions between photorefractive soliton waveguides in lithium niobate-on-insulator (LNOI) films is reported. The experiments were performed on 8 µm thick congruent undoped LiNbO3. Compared with bulk crystals, use reduces formation time, allows more control over interaction injected beams, and opens a route integration silicon optoelectronics functions. created X-junction structures show effective supervised learning,...

We report picosecond pulsed experiments and numerical simulations of spatially induced modulational instability, which we used to form stable periodic arrays bright soliton beams in a planar Kerr-like CS2 waveguide. have found that the generation stage these is accurately described by usual nonlinear Schrödinger wave equation, whereas temporal dynamics nonlinearity beneficial for subsequent propagation arrays. In regime finite molecular relaxation time reorientational index inhibits...

This work presents a reconfigurable opto-microfluidic coupling between optical waveguides and tilted microfluidic channels in monolithic lithium niobate crystal. The light path connecting two waveguide arrays located on opposite sides of channel depends the refractive index liquid phase hosting As result, properties flowing fluid, which is pumped into demand, can be exploited to control pathways inside optofluidic device. Proof-of-concept applications are herein presented, including...

Surface-wave solitons, induced by the pyroelectric effect, are formed at interface between a photorefractive ferroelectric medium and linear medium. These optical solitons trapped in both transverse dimensions efficiently attracted to interface. The asymmetric shape of nonlinear index change under charge saturation regime is responsible for surface-wave solitons' formation. Experimental demonstrations performed lithium niobate sample with moderate temperature change. phenomenon successfully...

In this paper we describe an upconversion detector in the mid infrared (around 3.5 μm). We take advantage of PPLN ridge waveguide technology to achieve single photon detection at room temperature on a spatial mode. With pump power 192 mW obtain efficiency 0.4% for 22k dark count per second, which corresponds noise equivalent 3.0 fW · Hz-1/2 and internal conversion 85 %/W pump.

In this paper, we present the first microfluidic junctions for droplet generation directly engraved on lithium niobate crystals by micromachining techniques, preparatory to a fully integrated opto-microfluidics lab-on-chip system. particular, laser ablation technique and mechanical are exploited realise channels in T- cross junction configurations. The quality of both lateral bottom surfaces therefore compared together with detailed study their roughness measured means atomic force...

Type II second-harmonic generation was performed in a 15.8-mm-long KTiOPO4 (KTP) micrometric ridge waveguide with an average transversal section of 38 μm2. Theoretical predictions are compared experiments. Strong agreements obtained for both phase-matching wavelengths and intensity. This work opens wide perspectives integrated parametric optics.

In this paper we report self-trapping of subnanojoule femtosecond near-infrared beams in photonic-grade undoped bulk lithium niobate under application an external dc electric field. We show that the phenomenon occurs thanks to photorefractive effect induced by a weak second-harmonic component generated large velocity mismatch. It offers way extend niobate's response spectrum for peak intensity lower than $1\phantom{\rule{0.3em}{0ex}}\mathrm{GW}∕{\mathrm{cm}}^{2}$, which is three orders...

Nonlinear quadratic waveguides are key components to obtain efficient frequency conversion. In this paper we present the performances of highly multimode periodically poled lithium niobate (PPLN) ridge for high power CW SHG presented. We report generation 1 W second harmonic on fundamental guided mode with a conversion efficiency 56% at telecom wavelengths. A stable nonlinear process is obtained despite use an undoped congruent LiNbO 3 crystal. The input damage threshold waveguide found set...

Amorphous Ge-Sb-Se thin films were co-sputtered from ${{\rm GeSe}_4}$GeSe4 and Sb}_2}{{\rm Se}_3}$Sb2Se3 targets. Depending on the film composition, linear optical properties studied by ellipsometry. The Kerr coefficient two-photon absorption estimated using Sheik-Bahae's formalism for of GeSe}_4} {\text -} {\rm Sb}_2{{\rm Se}_3}$GeSe4-Sb2Se3 compared to GeSe}_2}{\text -}{\rm Se}_3}$GeSe2-Sb2Se3 pseudo-binary system As}_2}{{\rm Se}_3}$As2Se3 as reference. was found within range $4.9...

Influence of the anisotropic tensorial electro-optic effect LiNbO(3):Fe photorefractive defocusing medium on propagation a vortex beam is numerically and experimentally investigated. Characteristic behaviors are depicted by varying light polarization, sign angular momentum directions.

Birefringence phase-matched third-harmonic generation at 1594 nm is performed for the first time in a KTiOPO 4 single crystal micrometric ridge waveguide. The energy conversion efficiency reaches 3.4% pump as low 2 µJ over pulse duration of 15 ps repetition rate 10 Hz. Strong agreements between theory and experiments both phase-matching obtained, which let us envision future triple photon quantum experiments.

La persistance du plafond de verre dans les entreprises françaises tient au cumul résistances sociales et organisationnelles (effets structure) freins relationnels réseau) qui entravent, limitent retardent l’insertion professionnelle l’avancement des femmes-cadres. Ces barrières créent distorsions systémiques à caractère sexiste nuisent l’épanouissement personnel professionnel ainsi qu’au bien-être travail cadres-femmes, tout autant qu’elles peuvent affecter la performance globale...

We report the formation of a 2D waveguide induced by self-trapped vortex beam in photorefractive–photovoltaic medium. Demonstrations are performed monitoring self-trapping dynamic an annular LiNbO3:Fe crystal. Control experimental observations is consistent with underlying physics revealed numerical model.

We report on the first on-sky sensitivity test a single arm of Astronomical Light Optical Hybrid Analysis (ALOHA) instrument, an uncooled up-conversion interferometer in L band (3.5 |$\mu$|m). Despite low coupling efficiency (in range 1 per cent) between 1-m class telescope and our we detect magnitude Lmag = 2.8 star with signal-to-noise ratio SNR 2.7 over 30 min integration time spectral resolution λ/Δλ 100. As ALOHA project aims to shift light from near-infrared, use very loss silica...

Abstract Triple-photon generation (TPG) is based on a third-order nonlinear optical interaction, which the most direct way to produce pure quantum three-photon states. These states can exhibit three-body correlations, and their statistics cannot be reproduced by any Gaussian of coherent sources or parametric twin-photon generator, making them potentially useful for information processing tasks such as state distillation, error-correction universal computing. Furthermore, entangled photon...

Design, fabrication and test of an optofluidic device are presented. It is constituted a circular waveguide crossing fluidic channel integrated in monolithic LiNbO₃ wafer. The realized by precision sawing the optical induced photorefractive beam self-trapping controlled pyroelectric effect. self-aligning property this latter writing technique allows both, efficient light coupling inside collection after crossing. shown that refractive index liquid present can be accurately...

Self-confined beams and spatial solitons were always investigated for a purely academic point of view, describing their formation cross-interaction. We propose novel paradigm integrated photonics circuits based on self-confined interconnections. consider that are not designed since beginning; network writing lasers provide the circuit configuration inside which information at different wavelength travels. we new designs interconnections both digital analog switching gates somehow inspired by...