Stéphane Guérin

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We apply the techniques of control theory and of sub-Riemannian geometry to laser-induced population transfer in two-and three-level quantum systems. The aim is to induce complete population transfer by one or two laser pulses minimizing the pulse fluences. Sub-Riemannian geometry and singular-Riemannian geometry provide a natural framework for this(More)
A method of calculating the characteristics of non-collinear phase-matching in both uniaxial and biaxial crystals is presented. Although significant work has been done to characterize collinear phase-matching and to present many of its applications, non-collinear phase-matching also has unique characteristics, leading to several useful applications. The(More)
High-throughput synthesis of the ferroelectric solid solution Pb(Zr<sub>1-x</sub>Ti<sub>x</sub>)O<sub>3</sub> (PZT) on single Pt/Ti/SiO<sub>2</sub>/Si substrates was demonstrated using a modified molecular beam epitaxy (MBE) system. The PZT films exhibited a phase transition from rhombohehdral (R) to tetragonal (T) symmetry as a function of Zr:Ti ratio,(More)
les fluctuations de phase laser sont importantes. Abstract We develop a robust and realistic mechanism for the generation of indistinguishable single-photon (SP) pulses with identical frequency and polarization. They are produced on demand from a coupled double-Raman atom-cavity system driven by a sequence of laser pump pulses. This scheme features a high(More)
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