Concept

Médecine au laser

Publications associées (246)

Laser-induced temperature jump measurements in the kinetics of association and dissociation of the nitrogen oxide (N2O3) + M = nitrogen dioxide + nitrous oxide + M system

Kinetic measurements have been made on the gas-phase reaction N2O4 + M .dblharw. 2NO2 + M by applying the temp.-jump relaxation method. Equil. mixts. contg. NO2, N2O4, a small quantity of an IR absorber, and an excess of a third-body bath gas, have been su ...

1992

Bulk Gaalas Mirror as a Saturable Absorber for Subpicosecond Pulse Generation around 835 Nm

Franz-Karl Reinhart, Marc-André Dupertuis, Denis Martin, Paul Beaud

We report on a bulk GaAlAs mirror which is used as a saturable absorber for subpicosecond pulse generation around 835 nm. The mirror consists of a 200 nm layer of bulk GaAlAs (with approximately 5% Al content) which is grown on a linear Bragg mirror and is ...

1992

Interface Measurements of Heterojunction Band Lineups with the Vanderbilt Free-Electron Laser

Giorgio Margaritondo, Alok Rudra, Marc Ilegems, Denis Martin

We used optical pumping by the Vanderbilt free-electron laser and the technique of internal photoemission to measure with high accuracy the conduction-band discontinuity of semiconductor heterojunction interfaces. The experiment is the first application to ...

1992

Luminescence Peculiarities on (Alga)as Single Quantum-Well

Franz-Karl Reinhart, Jean-Daniel Ganière

This paper reports on single quantum well characterization by means of luminescence excited with a laser (photoluminescence) and an electron beam (cathodoluminescence) at liquid helium temperatures. Small quantum well regions with smaller confinement were ...

1992

New Cascade Laser Transitions in Ch2f2 Pumped with the 9r32 Line of a Cw Co2-Laser

New cascade laser transitions of (CH2F2)C-12 at 172.50-mu-m, 208.83-mu-m, 220.44-mu-m, 223.99-mu-m and 250.61-mu-m are reported. A waveguide FIR laser was pumped with a quasi cw (CO2)-C-12-O-16 laser operating on the 9R32 line. Together with the already kn ...

1991

Temperature effect on the photolytic deposition of platinum ohmic contacts and Schottky diodes

Hubert van den Bergh

An argon laser is used to induce Laser Chem. Vapor Deposition (LCVD) of platinum using platinum bihexafluoroacetylacetonate as precursor. The process can be photolytic or pyrolytic depending on the laser power used. These processes are studied by recording ...

1991

Growth rates and electrical conductivity of microscopic ohmic contacts fabricated by laser chemical vapor deposition of platinum

Hubert van den Bergh

The laser chem. vapor deposition of platinum from its bishexafluoroacetylacetonate deriv. is studied with a cw Ar ion laser at 458 and 514 nm. The height, the width, as well as the elec. cond. of the deposited stripes are reported as a function of the vapo ...

1987

Laser isotope separation by combining isotopically selective condensation with infrared vibrational predissociation

Hubert van den Bergh, Bertrand Calpini, René Monot

The feasibility of a new, 2-laser, isotope sepn. scheme was tested. The 1st laser induces isotopically selective condensation in the collisional region of a free jet of SF6 dild. in Ar. Thus, a mol. beam contg. non-clustered 32SF6 and clustered 34SF6{m}Ar{ ...

1985

Optical alignment in magic-angle NMR

Geoffrey Bodenhausen

A simple optical alignment system is described for adjusting the angle of the axis of rotation of an Andrews-Beams rotor in magic-angle NMR expts. A low-power ruby laser mounted between the horns of the magnet cryostat is used a light source. The beam from ...

1982

Collisional energy transfer from excited polyatomic molecules produced by infrared multiple photon absorption

Hubert van den Bergh

A simple energy-grained master equation was used to model data on the multiphoton dissocn. of CF2HCl as a function of laser fluence and Ar bath-gas pressure. Information on energy transfer from vibrationally excited CF2HCl was obtained from an anal. of the ...

1981

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