Ramazanoglu, M., Larochelle, S., Garland, C. W., Birgeneau, R. J.
We have studied the effects of quenched random disorder created by dispersed aerosil nanoparticle gels on the nematic to smectic-A (N-SmA) and smectic-A to reentrant nematic (SmA- RN) phase...
Ye, F., Zhou, L., Meyer, S. A., Shelton, L. J., Belanger, D. P., Lu, L., ...
The critical exponent beta =0.17(1) for the three-dimensional random-field Ising model (RFIM) order parameter upon zero-field cooling (ZFC) has been determined using extinction-free magnetic x-ray...
Structural and magnetic properties of the single-layer manganese oxide La{1-x}Sr{1+x}MnO4 (2004)
Larochelle, S., Mehta, A., Lu, L., Mang, P. K., Vajk, O. P., Kaneko, N., ...
Using x-ray and neutron scattering, we have studied the structural and magnetic properties of the single-layer manganite La{1-x}Sr{1+x}MnO4 (0 < x < 0.7). Single crystals were grown by the...
Phase Decomposition and Chemical Inhomogeneity in Nd2-xCexCuO4 (2004)
Mang, P. K., Larochelle, S., Mehta, A., Vajk, O. P., Erickson, A. S., Lu, L., ...
Extensive X-ray and neutron scattering experiments and additional transmission electron microscopy results reveal the partial decomposition of Nd2-xCexCuO4 (NCCO) in a low-oxygen-fugacity environment...
Susceptibilities and Spin Gaps of Weakly-coupled Spin Ladders (2003)
We calculate the uniform and staggered susceptibilities of two-chain spin-1/2 Heisenberg ladders using Monte-Carlo simulations. We show that the gap extracted from the uniform susceptibility and the...
Spurious magnetism in high-Tc superconductor (2003)
Mang, P. K., Larochelle, S., Greven, M.
One challenge in condensed-matter physics is to unravel the interplay between magnetism and superconductivity in copper oxides with a high critical temperature (Tc). Kang et al. claim to have...
Order Parameter Criticality of the d=3 Random-Field Ising Antiferromagnet Fe(0.85)Zn(0.15)F2 (2002)
Ye, F., Zhou, L., Larochelle, S., Lu, L., Belanger, D. P., Greven, M., ...
The critical exponent beta =0.16 +- 0.02 for the random-field Ising model order parameter is determined using extinction-free magnetic x-ray scattering for Fe(0.85)Zn(0.15)F2 in magnetic fields of 10...
Liang, Ruixing, Bonn, D. A., Hardy, W. N., Wynn, Janice C., Moler, K. A., Lu, L., ...
High-purity and homogeneous YBa2Cu3Oy single crystals with carrier doping level near the AFM-SC boundary have been obtained in the oxygen content range between y = 6.340 and 6.370. The crystals are...
Contribution Of The Transverse (2001)
K. Dossou, S. Larochelle, M. Fontaine
The birefringence resulting from the index change asymmetry is calculated, using a finite element method, as a function of the absorption coefficient and transverse profiles. Spectral responses are...
Nature of $e_g$ Electron Order in La$_{1-x}$Sr$_{1+x}$MnO$_4$ (2001)
Larochelle, S., Mehta, A., Kaneko, N., Mang, P. K., Panchula, A. F., Zhou, L., ...
Synchrotron x-ray scattering measurements of the low-temperature structure of the single-layer manganese oxide La$_{1-x}$Sr$_{1+x}$MnO$_4$, over the doping range $0.33 \le x \le 0.67$, indicate the...
Pulse shaping with a phase-shifted fiber Bragg grating for antisymmetric pulse generation (2000)
G. Curatu, S. Larochelle, P. -a. Blanger
Pulses of arbitrary temporal shape can be generated by spectrally filtering a short pulse. Frequency selective reflectors, such as fiber Bragg gratings, can be designed to obtain the desired pulse...
Planar waveguides in ZBLAN fabricated by He ion implantation (2000)
Y. Zhao, S. Larochelle, J. Knystautas, N. Blanger, A. Villeneuve, M. Saad
: Single and double planar waveguides were fabricated by 2 MeV and 4 MeV He + implantation in ZBLAN. Calculation of ion implantation parameters, cut-off wavelength measurement and near-field...
C. Par, A. Villeneuve, S. Larochelle
This paper presents a linear stability analysis which confirms this observation. SPM compensation Dispersion compensation Dispersion compensation
M. Rochette, S. Larochelle, P. Y. Cortes, M. Guy, J. Lauzon
: Compensation of Polarization Mode Dispersion (PMD) induced by a chirped Bragg grating is performed using a short length of highly birefringent fiber. A recirculating loop experiment demonstrates...
P. -y. Corts, H. Fathallah, S. Larochelle, L. A. Rusch, P. Loiselle
: We present an interferometric setup to write apodized or apodized-chirped Bragg Gratings at any wavelength with the same phase mask and to a precision of 0.1 nm. An encoder for CDMA applications is...
Cascaded Nonlinear Phase Shift in a Novel Anharmonic Phase-Mismatch Configuration (2000)
G. Baldenberger, S. Larochelle, A. Villeneuve
this paper, like Trevino-Palacios et al. we consider a SHG process with a quasi-continuous varying phase mismatch (PM). In Section 2 we generalize the approach taken by Armstrong et al. for solving...
Split Compensation Of Dispersion And Self-Phase Modulation In Optical Communication Systems (2000)
C. Par, A. Villeneuve, S. Larochelle
We analyze in details a simplified configuration of a compensation method based on a negative nonlinearity. It is shown that one can cascade the compensation of dispersive and self-phase modulation...
Experimental Demonstration of Optical Fast Frequency Hopping-CDMA Communications (2000)
H. Fathallah, P. -y. Corts, L. A. Rusch, S. Larochelle, L. Pujol
: We demonstrate an all-fiber fast optical frequency-hop code division multiple access (FFH-CDMA) for high bandwidth communications. Transmission rates of up to 1.6 Gb/s per user were achieved with...
Gain Equalization of EDFA's with Bragg Gratings (2000)
M. Rochette, M. Guy, S. Larochelle, J. Lauzon, F. Tr Epanier
Flat-gain amplifiers are needed to ensure proper amplification of every channel in wavelength-division-multiplexed communication systems. Such amplifiers can be realized by combining a precisely...
1.25 Gbit/s transmission of optical FFH-OCDMA signals over 80 km with 16 users (2000)
H. Ben Jaafar, S. Larochelle, P. -y. Corts, H. Fathallah
: Encoding/decoding of FFH-OCDMA signals from 16 users is performed with Bragg grating arrays. Transmission of the multiplexed signals is demonstrated over 80 km of standard fiber at data rate...
Channel-Dropping Filter Based on a Grating-Frustrated Two-Core Fiber (2000)
A. -c. Jacob-poulin, R. Valle, S. Larochelle, D. Faucher, G. R. Atkins
We present experimental results on the operation of a dissimilar two-core fiber segment as a channel-dropping filter based on the principle of grating-frustrated coupling. The restoration of 100%...