6,473 research outputs found
Dubreuil (V.), Marchand (J.-P). — Le climat, l'eau et les hommes, ouvrage en l'honneur de Jean Mounier
No full textCouderc Jean-Marie. Dubreuil (V.), Marchand (J.-P). — Le climat, l'eau et les hommes, ouvrage en l'honneur de Jean Mounier. In: Norois, n°177, Janvier-Mars 1998. p. 110
Dubreuil (V.), Marchand (J.-P). — Le climat, l'eau et les hommes, ouvrage en l'honneur de Jean Mounier
No full textCouderc Jean-Marie. Dubreuil (V.), Marchand (J.-P). — Le climat, l'eau et les hommes, ouvrage en l'honneur de Jean Mounier. In: Norois, n°177, Janvier-Mars 1998. p. 110
Twofold phase matching for low-noise polarization frequency conversion in nonlinear waveguides
No full text4868. Autres relations de l'entrée de Louis XI à Paris, publiées par A. Couderc dans Mémoires de la Société de l'histoire de Paris, XXIII (1896), 125-166
No full text4868. Autres relations de l'entrée de Louis XI à Paris, publiées par A. Couderc dans Mémoires de la Société de l'histoire de Paris, XXIII (1896), 125-166. In: Molinier Auguste. Les Sources de l'histoire de France - Des origines aux guerres d'Italie (1494). V. Introduction générale - Les Valois (suite), Louis XI et Charles VIII (1461-1494) Paris : A. Picard et fils, 1904. p. 73
Observation of supercontinuum spiral emission in optical fibers
No full textIn this work, we reveal that when using femtosecond pump pulses, one has access to a different regime, where the peak power inside the MM fiber may reach and even surpass the critical power Pcr for catastrophic self-focusing (this is about 10 MW in fused- silica). When these peak power levels are reached, the propagating light beam undergoes a so-called filamentation phenomenon, leading to the so-called conical emission (CE)]. In our experiments, we report for the first time the formation of a supercontinuum spiral emission (SSE), where the spectral components of the output beam are spatially separated in the far-field emitted at the fiber output
Infrared light power transmission limitation of optical fibers
No full textLuminescence from silica defects is associated with a multiphoton absorption mechanism, responsible for strong nonlinear losses in graded-index multimode optical fibers. Our experiments reveal the existence of a fundamental limitation to the power transmission capabilities of optical fibers
Spatiotemporal nonlinear dynamics in multimode fibers
No full textNonlinear mode coupling in multimode optical fibers leads to complex self-organization phenomena. These are associated with the emergence of extreme waves, in the form of stable nonlinear coherent attractors characterized by low-order transverse mode patterns. The periodic or quasi-periodic oscillations of the multimode beam intensity due to mode beating lead to light scattering into a series of spectral sidebands spanning multiple octaves. We overview recent theory and experiments of complex spatiotemporal nonlinear beam reshaping phenomena in both passive and active multimode optical fiber systems
Glass Fiber Poling by an Extended Cavity Microchip Laser
No full textWe experimentally prove that glass fibers are efficiently optically poled when inserted in the extended cavity of a microchip laser. Methodical second harmonic measurements confirm the good quality of the poling
Multiphoton-Absorption-Excited Up-Conversion Luminescence in Optical Fibers
No full textWe experimentally demonstrate a previously unforeseen nonlinear effect in optical fibers: up-conversion luminescence generation excited by multiphoton absorption of femtosecond infrared pulses. We directly estimate the average number of photons involved in the up-conversion process, by varying the wavelength of the pump source. We highlight the role of nonbridging oxygen hole centers and oxygen-deficient center defects and directly compare the intensity of side-scattered luminescence with numerical simulations of pulse propagation
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