Patricia Segonds

Nonlinear optical properties of some tellurium (IV) oxide glasses

Abstract Thermal and optical properties of glasses of the TeO 2 | ZnO, TeO 2 | Nb 2 O 5 and TeO 2 | M 2 O | Nb 2 O 5 (M = Li, K) systems have been investigated. Linear and nonlinear indices of the materials increase with the TeO 2 rate. The highest values are obtained for the niobium tellurite glasses emphasizing the particularly significant role of NbO 6 octahedra in the optical response.

Crystal growth and refined Sellmeier equations over the complete transparency range of RbTiOPO4

Abstract The phase-matching directions sum- and difference-frequency generations are measured in the principal planes of RbTiOPO 4 crystals grown from a halide flux. The use of crystals with a cylindrical shape and of a tunable laser source allows us to perform accurate measurements over the complete transparency range of that material, and to determine a refined set of Sellmeier equations valid for any phase-matched interaction in that crystal.

Time-resolved absolute interferometric measurement of third-order nonlinear-optical susceptibilities

A modified Mach–Zehnder interferometer has been built for measurement of nonlinear-optical susceptibilities in bulk materials. Both slow- and fast-intensity-dependent refractive-index changes can be measured in absolute value, with femtosecond time resolution, high sensitivity, and precision, by means of a new fringe-locking technique. Results on fast nonlinearities of CS2 liquid and glasses are presented.

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

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.

Linear and nonlinear optical properties of the monoclinic Ca 4 YO(BO 3 ) 3 crystal

We report that the optical frame orientation is wavelength independent over the entire transmission range of the nonlinear monoclinic crystal Ca4YO(BO3)3 (YCOB). We used a new method based on internal conical refraction associated with x-ray diffraction on a single crystal cut as a sphere. Direct phase-matching-angle measurements of second-harmonic generation were performed in the principal planes of the spherical crystal for fundamental wavelengths up to 3.5 μm, and three absorption peaks were measured above 2.4 μm. By fitting all data simultaneously, we found new dispersion equations of the refractive indices of YCOB.

Nonlinear, dispersive, and phase-matching properties of the new chalcopyrite CdSiP 2 [Invited]

We compare the nonlinear and dispersive properties of the recently discovered mid-infrared nonlinear crystal CdSiP2 with other chalcopyrite materials to establish its potential for super-continuum generation through a second-order nonlinear process.

Laser operation of Yb3+ in the acentric RbTiOPO4 codoped with Nb5+.

We report on continuous-wave lasing of Yb(3+) at room temperature in the noncentrosymmetric RbTiOPO(4) crystal, codoped with Nb(5+), for all three possible polarizations. A maximum output power of 154 mW at 1050 nm was obtained for an absorbed power of 386 mW. The highest slope efficiency reached approximately 60% and the lowest threshold (with respect to the absorbed power) was 18 mW. The laser was tunable from 1009 to 1081 nm.

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

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.

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

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.

Angle noncritical phase-matched second-harmonic generation in the monoclinic crystal BaGa 4 Se 7

We performed a complete study of angle noncritical phase-matched second-harmonic generation in BaGa4Se7 in the mid-infrared region. We measured the dielectric frame orientation and showed that it does not rotate as a function of wavelength. We determined the phase-matching wavelengths and the associated spectral and angular acceptances along the x and y axes of the dielectric frame. We also estimated the magnitude of the nonlinear coefficients involved.