Nos tutelles



Accueil > Agenda Scientifique

26 septembre 2017: 1 événement


  • Trapped Ion Optical Atomic Frequency Standard in India

    Mardi 26 septembre 09:30-10:30 - Subhadeep De - CSIR-National Physical Laboratory, New Delhi , India.

    Trapped Ion Optical Atomic Frequency Standard in India

    Résumé : Accurate time is the basis for various sophisticated technologies. As for example, high-speed communication, positioning of satellites in their orbits, navigation, weather prediction, digital archiving, secured electronic transactions, network surveillance, mapping of underground resources, automatic transport system etc. rely on accurate “time synchronization” and “time stamping”. Recently realized space quantum communication have used highly accurate time synchronization between satellite and ground stations together with time stamping on the data packets as a tool for detection of weak photonic signal that carries the information. In fundamental sciences such as astronomical observations, measuring temporal constancy of fundamental constants, geodesy, violation of Lorentz symmetry rely on ultra-precise clocks. Atomic clocks are the backbone for generation of accurate time & frequency and in this regard highly forbidden optical transitions of atoms serve the most accuracy so far. Considering the next generation standard for the SI second will be based on the optical transitions and CSIR-NPL being the national metrology institute (NMI) of India, we have started developing frequency standards based on the ultra-narrow 4f146s 2S1/2 - 4f136s2 2F7/2 electric octupole (E3) optical transition of ytterbium-ion (171Yb+). At present we are assembling the Paul trap in its ultra-high vacuum housing and preparing the necessary optics for trapping and laser cooling of the ion. Overall progress on this activity and future plans to use it for probing fundamental sciences will be presented.

    Lieu : service 322, campus Saint-Jérôme

    En savoir plus : Trapped Ion Optical Atomic Frequency Standard in India