Power enhanced and fast swept source for phase conjugate optical coherence tomography

FTuY - Coherence Tomography: Paper FTuY1We have developed a wavelength-swept source based on fiber parametric amplification and Fourier domain mode locking with increased power and speed to take full advantage of 2x resolution enhancement and dispersion cancellation of phase-conjugate OCT.postprintFrontiers in Optics 2010 / Laser Science XXVI (FiO/LS 2010), Rochester, N.Y., 24 October 2010. In Optics InfoBase, 201

Reasons and achievements of the mobility and professional activity of portuguese engineer Cândido Celestino Xavier Cordeiro (1842-1905)

Through the biography of engineer Cândido Xavier Cordeiro, an engineer who worked in the second half of the 19th century and the first years of the 20th century, i.e. in a period that began with the Regeneration and with a policy of material improvements in the country, we try to get closer to issues such as: the conditions of scientific and technical training in the country; the way in which training abroad and study visits favoured the transfer of ideas and technologies; the transfer of technology and its application to the works being carried out in the country; the importance of the development of the railway; the intervention of these men in the country's administrative and central and local affairs

Introduction of a Fully Relativistic Capable Basis Set in the ab initio Orthogonalized Linear Combination of Atomic Orbitals Method

Title from PDF of title page, viewed on September 30, 2014Thesis advisor: Paul RulisVitaIncludes bibliographic references (pages 46-48)Thesis (M. S.)--College of Arts and Sciences. University of Missouri--Kansas City, 2014Large simulation cell sizes, relativistic effects, and the need to correctly model excited state properties are major impediments to the accurate prediction of the optical properties of candidate materials for solid-state laser crystal and luminescent applications. To overcome these challenges, new methods must be created to improve the electron orbital wavefunction and interactions. In this work, a method has been developed to create new analytical four-component, fully-relativistic and single-component scalar relativistic descriptions of the atomic orbital wave functions from Grasp2K numerically represented atomic orbitals. In addition, adapted theory for the calculation of the relativistic kinetic energy contribution to Hamiltonian which bypasses directly solving the Dirac equation has been explicated. The orbital description improvements are tested against YAG, YBCO, SnO2 and BiF3. The improvements to the basis set reflect an improvement in both computational speed and accuracyAbstract -- List of illustrations -- List of tables -- Introduction -- Methods -- Scalar relativistic basis set improvements -- Adaptation of relativistic kinetic energy theory - Conclusions and future work -- Reference

Slow light using spectral hole burning in a Tm 3 + -doped yttrium-aluminum-garnet crystal

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Wide bandwidth phase-locked diode laser with an intra-cavity electro-optic modulator

International audienceTwo extended cavity laser diodes are phase-locked, thanks to an intra-cavity electro-optical modulator. The phase-locked loop bandwidth is on the order of 10 MHz, which is about twice larger than when the feedback correction is applied on the laser current. The phase noise reaches -120 dBrad2/Hz at 10 kHz. This new scheme reduces the residual laser phase noise, which constitutes one of the dominant contributions in the sensitivity limit of atom interferometers using two-photon transitions

Premiers résultats d'un gravimètre atomique au LNE-SYRTE

Dans le cadre du projet français de Balance du Watt, visant à redéfinir l'unité de masse du système international [1], un gravimètre atomique est en cours de mise au point à l'Observatoire de Paris. La mesure de g est basée sur les interférences entre ondes de matières d'atomes froids de $^{87}$ Rb. Les premières franges d'interférences ont été obtenues cette année, et la stabilité atteinte est de $7.10^{-8}\,{\rm g}/\surd$Hz

Atom interferometry at LNE-SYRTE for accurate measurement of gravity

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