15 research outputs found
Detection electro-optique par echantillonnage de rayonnement Terahertz emis par une antenne Ă large ouverture
Full text linkPhotoinscription in glassy SiO2 using a femtosecond laser: Small-angle neutron scattering and high-energy x-ray diffraction study
Full text linkRefractive index changes of stantard telecommunication fiber through exposure to femtosecond laser pulses at 810 nm
Full text linkA phenomenological approach for femtosecond-pulses-induced refractive-index changes inside dielectrics
Full text linkChanges in refractive index of standard telecommunication fiber through exposure to femtosecond laser pulses at 810 nm
Full text linkFORMATION OF BRAGG GRATINGS IN GERMANIUM DOPED OPTICAL FIBERS USING A PRISM INTERFEROMETER
Full text linkBragg gratings have been written in Germanium doped core silica fibers by transversally exposing the fibers to fringe patterns produced by a pair of coherent U.V. pulsed beams combined inside a prism interferometer. The transmission spectra of the gratings have been recorded at various times of irradiation. The drop in transmission near resonance wavelength may be as large as 100%, depending on the experimental conditions of the writing experiment. The thermal annealing behavior of different gratings shows that the evolution of the fiber transmittivity recovery versus temperature depends upon the number and the energy of the laser pulses applied to form the grating and upon the nature of the fiber
La corrélation à filtre de gaz dans le domaine submillimétrique
Full text linkLa méthode de corrélation à filtre de gaz permet de
détecter un gaz cible au sein d'un mélange. La pression dans
les deux cellules joue des rĂ´les primordiaux sur la
sensibilité ainsi que sur la sélectivité. Cette
méthode a été exploitée dans le domaine de
l'infrarouge lointain. La source Ă©mettrice est une antenne Ă
large ouverture dont le spectre s'Ă©tend jusqu'Ă environ
2 THz
