Probing multilayer stack reflectors by low coherence interferometry in extreme ultraviolet

International audienceWe use low coherence interferometry to investigate the depth structure of a complex multilayer stack reflector. The probing instrument is an interferometer based on a Fresnel's bi-mirror illuminated by relatively wide-band synchrotron undulator light near 13.5 nm. Simulations clearly confirm that our test object generates two back propagated signals that behave as if reflected on two effective planes. First results in this spectral range may open the way to a new physical approach to extreme ultraviolet sample characterization in the form of line-scan optical coherence tomography

Les fosses gallo-romaines de la rue du 19 mars 1962 à Locmaria près de Quimper

The excavation of a group pits in the center of the Gallo-Roman town of Locmaria, near Quimper, reveals an interesting collection of pottery. One of the pits contains a homogeneous group of Augustean ceramics. The others, filled towards the IIIrd century A.D. with an assemblage of pottery, the heterogeneous nature of which illustrates the movement of materials in a constantly evolving area. The analyses of the finds enable us to understand the mode of destruction of these urban intallations and their probable datation. They also give informations about the older and more récent periods of the Gallo-Roman town.La fouille d'un ensemble de fosses au centre de l'agglomération gallo-romaine de Locmaria, près de Quimper, livre un lot intéressant de poteries. L'une des fosses contient un mobilier homogène d'époque augustéenne. Les autres, comblées vers la fin du IIIe siècle après J.-C, reçoivent un lot de poteries dont la composition hétérogène traduit bien les transferts de matériaux dans un quartier constamment transformé. L'analyse de ce lot permet de comprendre le mode de destruction des installations urbaines disparues et leur probable datation. Elles renseignent également à propos des périodes les plus anciennes et les plus récentes de l'agglomération antique.Le Bihan Jean-Paul, Robic Jean-Yves. Les fosses gallo-romaines de la rue du 19 mars 1962 à Locmaria près de Quimper. In: Revue archéologique de l'ouest, tome 17, 2000. pp. 199-214

Méthodes et techniques de fouille appliquées au site protohistorique de Mez-Notariou à Ouessant

The complexity of the protohistoric site of Mez-notariou on Ushant, the duration of the excavation and the fact that it is on an island lead to the setting up of specially adapted and evolutive excavating strategy. A System is developed and continually modified. Appropriated, and often new, techniques of excavating, and of analysing the remains are refined : systematic overhead photography used for the ground plan and for plotting the contour lines, stereoscopic photography and research into methods of surveying in three dimensions, and the used of compressed air. These methods are analyse from the point of view of generalized application, and a review of the implications for the organisation of excavation sites is carried out.La complexité du site protohistorique de Mez-Notariou à Ouessant, la durée du chantier et son implantation dans une île suscitent la mise en place d'une stratégie de fouille adaptée et évolutive. Une méthode est développée, constamment modifiée. Des techniques de fouille et d'analyse des vestiges appropriées, et souvent nouvelles, sont mises au point : photographie verticale systématique appliquée au plan et au tracé des courbes de niveaux, stéréophotographie et recherche sur les méthodes de relevés en trois dimensions, usage de l'air comprimé. Ces méthodes sont analysées dans la perspective d'une application généralisée et une réflexion est conduite sur les conséquences pour l'organisation des chantiers de fouilles.Le Bihan Jean-Paul, Goalic Y.L., Robic Jean-Yves. Méthodes et techniques de fouille appliquées au site protohistorique de Mez-Notariou à Ouessant. In: Revue archéologique de l'ouest, tome 10, 1993. pp. 163-177

Probing multilayer stack reflectors by low coherence interferometry in extreme ultraviolet

International audienceWe use low coherence interferometry to investigate the depth structure of a complex multilayer stack reflector. The probing instrument is an interferometer based on a Fresnel's bi-mirror illuminated by relatively wide-band synchrotron undulator light near 13.5 nm. Simulations clearly confirm that our test object generates two back propagated signals that behave as if reflected on two effective planes. First results in this spectral range may open the way to a new physical approach to extreme ultraviolet sample characterization in the form of line-scan optical coherence tomography

Characterization of optics and masks for the EUV lithography

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Chemical Characterization of PM2.5 for the Year 2013 for 5 Rural Background Sites in France

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Chemical Characterization of PM2.5 for the Year 2013 for 5 Rural Background Sites in France

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Printability of nonsmoothed buried defects in extreme ultraviolet lithography mask blank

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