A HIGH POWER LNA LASER FOR APPLICATION TO A NEW POLARIZED ELECTRON SOURCE (2008)
Essabaa, S., Arianer, J., Brissaud, I., Humblot, H., Leduc, M., Schearer, L.
The recent development of high energy electron accelerators has generated a renewed interest in high current, high polarization electron sources. We have investigated several modifications to a...
Schearer, L., Essabaa, S., Leduc, M.
A diode-pumped Nd:Lanthanum Magnesium Hexaluminate laser was constructed which provides up to 15 mW of single-mode, tunable CW emission at 1083 nm. By appropriately polarizing the narrow-band laser...
A HIGH POWER LNA LASER FOR APPLICATION TO A NEW POLARIZED ELECTRON SOURCE (2008)
Essabaa, S., Arianer, J., Brissaud, I., Humblot, H., Leduc, M., Schearer, L.
The recent development of high energy electron accelerators has generated a renewed interest in high current, high polarization electron sources. We have investigated several modifications to a...
Schearer, L., Essabaa, S., Leduc, M.
A diode-pumped Nd:Lanthanum Magnesium Hexaluminate laser was constructed which provides up to 15 mW of single-mode, tunable CW emission at 1083 nm. By appropriately polarizing the narrow-band laser...
Schearer, L., Essabaa, S., Leduc, M.
A diode-pumped Nd:Lanthanum Magnesium Hexaluminate laser was constructed which provides up to 15 mW of single-mode, tunable CW emission at 1083 nm. By appropriately polarizing the narrow-band laser...
A HIGH POWER LNA LASER FOR APPLICATION TO A NEW POLARIZED ELECTRON SOURCE (2008)
Essabaa, S., Arianer, J., Brissaud, I., Humblot, H., Leduc, M., Schearer, L.
The recent development of high energy electron accelerators has generated a renewed interest in high current, high polarization electron sources. We have investigated several modifications to a...
Optical pumping of helium with arc lamp excited LNA lasers (2008)
Aminoff, C.G., Larat, C., Leduc, M., Laloë, F.
We have developed a compact and relatively inexpensive laser source at λ =1.083 μm, suitable for optical pumping in helium. The laser is made of an LNA crystal transversely pumped by...
Obtaining polarized liquid helium 3 from optically oriented gas (2008)
Tastevin, G., Nacher, P.J., Wiesenfeld, L., Leduc, M., Laloë, F.
Spin polarized liquid helium three can be obtained by liquefaction of a gas polarized by laser optical pumping. We show that this method can lead to nuclear polarizations exceeding 40 % in a liquid...
Direct detection of spin waves in gaseous 3He↑ (2008)
Tastevin, G., Nacher, P.J., Leduc, M., Laloë, F.
In gaseous spin-polarized 3He at low temperature, spin-diffusion becomes oscillatory and gives rise to spin waves; these waves have a quality factor μM, where M is the (relative) nuclear...
Spin rotation effects and spin waves in gaseous 3He↑ (2008)
Nacher, P.J., Tastevin, G., Leduc, M., Crampton, S.B., Laloë, F.
Spin polarized gases such as H↑ or 3He↑ can propagate damped spin waves at low temperatures; their origin is the so-called « identical spin rotation effect » in collisions between...
Nuclear polarization through optical pumping of gaseous 3He below 1 K (2008)
Himbert, M., Lefevre-Seguin, V., Nacher, P.J., Dupont-Roc, J., Leduc, M., Laloë, F.
We have extended to temperatures below 1 K the optical pumping technique for polarizing the nuclei pf ground state 3He atoms in the gas phase. A superfluid 4He film covering the surface of the pyrex...
Polarisation nucléaire de 3He gazeux par pompage optique laser (2008)
Nacher, P.J., Leduc, M., Trénec, G., Laloë, F.
Une polarisation nucléaire élevée, de l'ordre de 70 %, a été obtenue par pompage optique dans 3He gazeux grâce à l'utilisation d'un laser à centres colorés (F+2* dans NaF) fournissant...
NUCLEAR POLARIZATION OF A 3He GAS BY LASER OPTICAL PUMPING (2008)
Leduc, M., Trenec, G., Laloë, F.
A brief introduction to the optical pumping technique as a method for nuclearly polarizing a 3He gas is given. Large polarizations should be obtainable by replacing the discharge lamps by tunable...
Barbé, R., Leduc, M., Laloë, F.
On vérifie en détail les calculs théoriques d'un article précédent sur les formes inhabituelles de courbes de résonance en champ de radiofréquence inhomogène. Les expériences sont...
Résonance magnétique en champ de radiofréquence inhomogène. 1 re partie : Étude théorique (2008)
Barbé, R., Leduc, M., Laloë, F.
On étudie dans cet article l'effet d'un champ de radiofréquence très inhomogène sur un ensemble de spins en mouvement. Lorsque le champ magnétique statique est balayé au voisinage de la...
Dupont-Roc, J., Leduc, M., Laloë, F.
Dans ce second article, nous nous intéressons aux expériences de résonance magnétique sur des atomes de 3He soumis au pompage optique « indirect » par l'intermédiaire du niveau métastable 2...
Dupont-Roc, J., Leduc, M., Laloë, F.
On étudie théoriquement l'effet des collisions d'échange de métastabilité dans 3He sur les variables internes des atomes, dans l'état fondamental 1 1S0 et dans l'état métastable 2 3S 1. La...
Leduc, M., Laloë, F., Brossel, J.
On décrit dans cet article une expérience de pompage optique d'un mélange gazeux des deux isotopes 3He et 4He, dans lequel une décharge faible est entretenue. Ceci permet d'orienter...
Optical pumping of helium with arc lamp excited LNA lasers (2008)
Aminoff, C.G., Larat, C., Leduc, M., Laloë, F.
We have developed a compact and relatively inexpensive laser source at λ =1.083 μm, suitable for optical pumping in helium. The laser is made of an LNA crystal transversely pumped by...
Obtaining polarized liquid helium 3 from optically oriented gas (2008)
Tastevin, G., Nacher, P.J., Wiesenfeld, L., Leduc, M., Laloë, F.
Spin polarized liquid helium three can be obtained by liquefaction of a gas polarized by laser optical pumping. We show that this method can lead to nuclear polarizations exceeding 40 % in a liquid...
Direct detection of spin waves in gaseous 3He↑ (2008)
Tastevin, G., Nacher, P.J., Leduc, M., Laloë, F.
In gaseous spin-polarized 3He at low temperature, spin-diffusion becomes oscillatory and gives rise to spin waves; these waves have a quality factor μM, where M is the (relative) nuclear...
Spin rotation effects and spin waves in gaseous 3He↑ (2008)
Nacher, P.J., Tastevin, G., Leduc, M., Crampton, S.B., Laloë, F.
Spin polarized gases such as H↑ or 3He↑ can propagate damped spin waves at low temperatures; their origin is the so-called « identical spin rotation effect » in collisions between...
NUCLEAR POLARIZATION OF A 3He GAS BY LASER OPTICAL PUMPING (2008)
Leduc, M., Trenec, G., Laloë, F.
A brief introduction to the optical pumping technique as a method for nuclearly polarizing a 3He gas is given. Large polarizations should be obtainable by replacing the discharge lamps by tunable...
Barbé, R., Leduc, M., Laloë, F.
On vérifie en détail les calculs théoriques d'un article précédent sur les formes inhabituelles de courbes de résonance en champ de radiofréquence inhomogène. Les expériences sont...
Résonance magnétique en champ de radiofréquence inhomogène. 1 re partie : Étude théorique (2008)
Barbé, R., Leduc, M., Laloë, F.
On étudie dans cet article l'effet d'un champ de radiofréquence très inhomogène sur un ensemble de spins en mouvement. Lorsque le champ magnétique statique est balayé au voisinage de la...
Dupont-Roc, J., Leduc, M., Laloë, F.
Dans ce second article, nous nous intéressons aux expériences de résonance magnétique sur des atomes de 3He soumis au pompage optique « indirect » par l'intermédiaire du niveau métastable 2...
Dupont-Roc, J., Leduc, M., Laloë, F.
On étudie théoriquement l'effet des collisions d'échange de métastabilité dans 3He sur les variables internes des atomes, dans l'état fondamental 1 1S0 et dans l'état métastable 2 3S 1. La...
Leduc, M., Laloë, F., Brossel, J.
On décrit dans cet article une expérience de pompage optique d'un mélange gazeux des deux isotopes 3He et 4He, dans lequel une décharge faible est entretenue. Ceci permet d'orienter...
Laloë, F., Leduc, M., Minguzzi, P.
On étudie dans cet article le lien qui existe entre l'anisotropie des propriétés optiques d'une vapeur atomique et les propriétés angulaires des atomes dans l'état fondamental. La direction du...
Laloë, F., Leduc, M., Minguzzi, P.
Cet article est consacré à l'étude de l'optimisation des signaux de détection optique obtenus dans une expérience de pompage optique. Les formules générales obtenues dans des publications...
Laloë, F., Leduc, M., Minguzzi, P.
On étudie dans cet article le lien qui existe entre l'anisotropie des propriétés optiques d'une vapeur atomique et les propriétés angulaires des atomes dans l'état fondamental. La direction du...
Laloë, F., Leduc, M., Minguzzi, P.
Cet article est consacré à l'étude de l'optimisation des signaux de détection optique obtenus dans une expérience de pompage optique. Les formules générales obtenues dans des publications...
Koelemeij, J. C. J., Leduc, M.
A numerical investigation of two-laser photoassociation (PA) spectroscopy on spin-polarized metastable helium (He*) atoms is presented within the context of experimental observation of the...
Bose-Einstein Condensation of Metastable Helium (2006)
Santos, F. Pereira Dos, Leonard, J., Wang, Junmin, Barrelet, C. J., Perales, F., Rasel, E., ...
We have observed a Bose-Einstein Condensate in a dilute gas of $^4$He in the $2^3S_1$ metastable state. We find a critical temperature of $(4.7\pm0.5) \mu$K and a typical number of atoms at the...
Moal, S., Portier, M., Kim, J., Dugué, J., Rapol, U. D., Leduc, M., ...
We present a new measurement of the s-wave scattering length a of spin-polarized helium atoms in the 2^3S_1 metastable state. Using two-photon photoassociation spectroscopy and dark resonances we...
Moal, S., Portier, M., Kim, J., Dugué, J., Rapol, U. D., Leduc, M., ...
We present a new measurement of the s-wave scattering length a of spin-polarized helium atoms in the 2^3S_1 metastable state. Using two-photon photoassociation spectroscopy and dark resonances we...
Kim, J., Moal, S., Portier, M., Dugué, J., Leduc, M., Cohen-Tannoudji, C.
We observe light-induced frequency shifts in one-color photoassociative spectra of magnetically trapped $^4$He$^*$ atoms in the metastable $2^3S_1$ state. A pair of ultracold spin-polarized $2^3S_1$...
Rotationally induced Penning ionization of ultracold photoassociated helium dimers (2005)
Léonard, J., Mosk, A. P., Walhout, M., Leduc, M., Van Rijnbach, M., Nehari, D., ...
We have studied photoassociation of metastable \tripS helium atoms near the \tripS-\tripP asymptote by both ion detection in a magneto-optical trap and trap-loss measurements in a magnetic trap. A...
Smart, S.M., Bunce, R.G.H., Marrs, R., LeDuc, M., Firbank, L.G., Maskell, L.C., ...
Presence of higher plant species was recorded in 1455 permanently marked quadrats located across Britain in 1978, 1990 and 1998 in a stratified, random sample of 259 1 km squares. Significant...
Moal, S., Portier, M., Kim, J., Dugué, J., Rapol, U. D., Leduc, M., ...
We present a new measurement of the s-wave scattering length a of spin-polarized helium atoms in the 2^3S_1 metastable state. Using two-photon photoassociation spectroscopy and dark resonances we...
Moal, S., Portier, M., Kim, J., Dugué, J., Rapol, U. D., Leduc, M., ...
We present a new measurement of the s-wave scattering length a of spin-polarized helium atoms in the 2^3S_1 metastable state. Using two-photon photoassociation spectroscopy and dark resonances we...
Koelemeij, J. C. J., Leduc, M.
A numerical investigation of two-laser photoassociation (PA) spectroscopy on spin-polarized metastable helium (He*) atoms is presented within the context of experimental observation of the...
Analysis of Photoassociation Spectra for Giant Helium Dimers. (2004)
Léonard, J., Mosk, A.P., Walhout, M., Leduc, M., Cohen-Tannoudji, C.
We perform a theoretical analysis to interpret the spectra of purelylong-range helium dimers produced by photoassociation (PA) in anultra-cold gas of metastable helium atoms. The experimental...
Analysis of Photoassociation Spectra for Giant Helium Dimers. (2004)
Léonard, J., Mosk, A.P., Walhout, M., Leduc, M., Cohen-Tannoudji, C.
We perform a theoretical analysis to interpret the spectra of purelylong-range helium dimers produced by photoassociation (PA) in anultra-cold gas of metastable helium atoms. The experimental...
Analyses of photoassociation spectra for giant helium dimers (2004)
Leonard, J., Mosk, A.P., Walhout, M., Straten, P. Van Der, Leduc, M., Cohen-Tannoudji, C.
Analysis of Photoassociation Spectra for Giant Helium Dimers. (2003)
Léonard, J., Mosk, A.P., Walhout, M., Leduc, M., Cohen-Tannoudji, C.
We perform a theoretical analysis to interpret the spectra of purelylong-range helium dimers produced by photoassociation (PA) in anultra-cold gas of metastable helium atoms. The experimental...
Analysis of Photoassociation Spectra for Giant Helium Dimers (2003)
Leonard, J., Mosk, A. P., Walhout, M., Leduc, M., Cohen-Tannoudji, C.
We perform a theoretical analysis to interpret the spectra of purely long-range helium dimers produced by photoassociation (PA) in an ultra-cold gas of metastable helium atoms. The experimental...
Analysis of Photoassociation Spectra for Giant Helium Dimers. (2003)
Léonard, J., Mosk, A.P., Walhout, M., Leduc, M., Cohen-Tannoudji, C.
We perform a theoretical analysis to interpret the spectra of purelylong-range helium dimers produced by photoassociation (PA) in anultra-cold gas of metastable helium atoms. The experimental...
Giant Helium Dimers Produced by Photoassociation of Ultracold Metastable Atoms (2003)
Leonard, J., Walhout, M., Mosk, A. P., Mueller, T., Leduc, M., Cohen-Tannoudji, C.
We produce giant helium dimers by photoassociation of metastable helium atoms in a magnetically trapped, ultracold cloud. The photoassociation laser is detuned red of the atomic $2^3S_1 - 2^3P_0 $...
RESET Roadmap for European research on Smartcard rElated Technologies (2003)
Gras, F., Le Dantec, B., Trebucq, O., Cucinelli, B, Leduc, M., Simplot, D., ...
The objective of RESET (Roadmap for European research on Smartcard related Technologies) is to investigate the RTD needs corresponding to current and expected future technology gaps, identified by...
RESET Roadmap for European research on Smartcard rElated Technologies (2003)
Gras, F., Le Dantec, B., Trebucq, O., Cucinelli, B, Leduc, M., Simplot, D., ...
The objective of RESET (Roadmap for European research on Smartcard related Technologies) is to investigate the RTD needs corresponding to current and expected future technology gaps, identified by...
RESET Roadmap for European research on Smartcard rElated Technologies (2003)
Gras, F., Le Dantec, B., Trebucq, O., Cucinelli, B, Leduc, M., Simplot, D., ...
The objective of RESET (Roadmap for European research on Smartcard related Technologies) is to investigate the RTD needs corresponding to current and expected future technology gaps, identified by...
Hydrodynamic modes in a trapped gas of metastable helium above the Bose-Einstein transition (2002)
Leduc, M., Leonard, J., Santos, F. Pereira Dos, Jahier, E., Schwartz, S., Cohen-Tannoudji, C.
This article describes experiments performed with an ultracold gas of metastable helium above the Bose-Einstein transition. The gas is trapped in an harmonic magnetic potential and collective...
Penning collisions of laser-cooled metastable helium atoms (2001)
Santos, F. Pereira Dos, Perales, F., Leonard, J., Sinatra, A., Wang, Junmin, Pavone, F. S., ...
We present experimental results on the two-body loss rates in a magneto-optical trap of metastable helium atoms. Absolute rates are measured in a systematic way for several laser detunings ranging...
Efficient magneto-optical trapping of a metastable helium gas (2001)
Santos, F. Pereira Dos, Perales, F., Leonard, J., Sinatra, A., Wang, Junmin, Pavone, F. S., ...
This article presents a new experiment aiming at BEC of metastable helium atoms. It describes the design of a high flux discharge source of atoms and a robust laser system using a DBR diode coupled...
Bose-Einstein Condensation of Metastable Helium (2001)
Santos, F. Pereira Dos, Leonard, J., Wang, Junmin, Barrelet, C. J., Perales, F., Rasel, E., ...
We have observed a Bose-Einstein Condensate in a dilute gas of $^4$He in the $2^3S_1$ metastable state. We find a critical temperature of $(4.7\pm0.5) \mu$K and a typical number of atoms at the...
Controlled Radical Polymerization with Dendrimers Containing Stable Radicals. (1998)
Shigemoto, T., Matyjaszewski, K., Leduc, M., Frechet, J. M.
TEMPO-based stable radicals were attached to dendrimers of variable size and used to control radical polymerization of styrene, vinyl acetate and (meth)acrylates. Thermal polymerization of styrene...
Expression of Recombinant Human BChE in the Milk of Transgenic Mice (1998)
Huang, Y. J., Lazaris, A., Bellemare, A., Leduc, M., Cote, M., Karatzas, C. N., ...
Human butyrylcholinesterase (huBChE) has been successfully used as prophylaxis in animal models to prevent intoxication as a result of exposure to Organophosphate (OP) agents. Since large quantities...
Direct measurement of the spatial correlation function of ultracold atoms (1997)
Saubamea, B., Hijmans, T.W., Kulin, S., Rasel, E., Peik, E., Leduc, M., ...
Coherent manipulation of Atomic Wave Packets by Adiabatic Transfer (1997)
Kulin, S., Saubamea, B., Peik, E., Lawall, J., Hijmans, T.W., Leduc, M., ...
3He Nuclear Spin Relaxation in Cesium Coated Cells at Room Temperature (1995)
Chéron, B., Gilles, H., Hamel, J., Leduc, M., Moreau, O., Noël, E.
The relaxation time Tl of 3He gas, nuclearly polarized by optical pumping, has been significantly increased by internally coating the glass cells with cesium. Values of Tl of order 45 hours were...
3He Nuclear Spin Relaxation in Cesium Coated Cells at Room Temperature (1995)
Chéron, B., Gilles, H., Hamel, J., Leduc, M., Moreau, O., Noël, E.
The relaxation time Tl of 3He gas, nuclearly polarized by optical pumping, has been significantly increased by internally coating the glass cells with cesium. Values of Tl of order 45 hours were...
3He Nuclear Spin Relaxation in Cesium Coated Cells at Room Temperature (1995)
Chéron, B., Gilles, H., Hamel, J., Leduc, M., Moreau, O., Noël, E.
The relaxation time Tl of 3He gas, nuclearly polarized by optical pumping, has been significantly increased by internally coating the glass cells with cesium. Values of Tl of order 45 hours were...
Accurate optical measurement of nuclear polarization in optically pumped 3He gas (1992)
Bigelow, N., Nacher, P., Leduc, M.
Large nuclear polarizations M (over 80 %) can now be achieved in gaseous 3He by optical pumping. The gas is excited by an RF discharge and is oriented using a high power LNA laser which is lamp...