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International audience; We report the observation of the very narrow 4d105s 2S1/2→4d95s2 2D5/2 transition in atomic silver. The frequencies of the hyperfine components in 107Ag and 109Ag have been measured using Doppler-free twophoton laser spectroscopy of a thermal beam and heterodyne calibration with respect to the a1 component of the 62P(4-5) line in molecular iodine near 661 nm. For the center of gravity of a mixture of natural abundance, we deduce the value 906 641 295.77(19) MHz. For the isotope shift, we obtain nu(109Ag)−nu(107Ag) =564.1537 MHz, from which we deduce the frequency and isotope shift of the 4d105s 2S1/2→4d106p 2P3/2 transition at 206 nm

International audience; We demonstrate an original solution to obtain a single-frequency ring laser coupled to an external passive nonresonant ring cavity, which plays the role of an optical diode. This system provides more output power than systems with an intracavity unidirectional device. To the best of our knowledge, this work marks the first demonstration of a unidirectional planar ring laser at 1.3 _m. Using 12 W at 797 nm to pump a Nd:YLF laser, combined with intracavity second-harmonic generation, we achieve yields of 440 mW at 661.3 nm and 340 mW at 656.0 nm

International audience; We describe single-frequency operation of a diode-pumped Nd:YLF laser in the range 1311.9-1317.2 nm. It can be used for the interrogation of the clock transition in calcium (1314.0 nm) or spectroscopy in hydrogen and metastable singly ionized helium (1312.6 nm). By using a twisted-mode cavity, we have obtained output powers of 830 and 970mWat 1312.6 and 1314.0 nm, respectively, in a single longitudinal mode

International audience

This document describes a set of laser spectroscopy experiments carried out from 1985 to 2003. We describe measurements of isotope shifts (Gd, Xe), determinations of the Rydberg constant and 1S Lamb shift in hydrogen as well as parity violation in Cs. After a review of atomic, molecular and ionic candidates for an optical clock, we describe a project using atomic silver. In this experiment undertaken at the BNM-INM, Cnam, Paris, the aim is to realise the S.I. second via a Doppler-free two-photon transition at 661.3 nm excited with a sample of laser-cooled atoms. We present the early results obtained using a thermal atomic beam and dye lasers and describe the development of suitable solid-state lasers., Ce document décrit une ensemble de travaux effectué entre 1985 et 2003 dans le domaine de la spectroscopie laser des atomes. Il s'agit des mesures d'écart isotopiques (Gd, Xe), de la détermination de la constante de Rydberg, de la mesure du Lamb shift du niveau fondamental de l'hydrogène ainsi que de la violation de la parité dans le Cs. Un survol des candidats atomiques , moléculaires et ioniques susceptibles de fournir une horloge optique est suivi de la description d'un projet concernant l'atome d'argent. Cette expérience, entreprise au BNM-INM, Cnam, Paris, vise la réalisation de la seconde grâce à l'emploi d'une transition à deux photons de 661,3 nm sans effet Doppler excitée dans un échantillon d'atomes refroidis par laser. Les premières expériences réalisées avec un jet atomique thermique et des lasers à colorant sont présentées ainsi que le développement des sources laser solides adéquates.