Objetivo
The aim of our Project is to carry out theoretical and experimental studies for developing a high-stability Rubidium vapour-cell frequency standard meeting the requirements of future GNSS on-board clocks: short-term stability below 1.10-12 at one second (with an objective of 5.10-13) and a daily frequency stability of below 1.10-14 (with an objective of 5.10-15). In the project the laser optical pumping and coherent population trapping (CPT) in Rubidium cells with buffer gases mixture and with anti-relaxation wall-coating will be investigated both theoretically and experimentally applied to on-board atomic frequency standards. The special cells filled by 87Rb isotope and with anti-relaxation wall-coating will be developed, manufactured and experimentally studied, especially for the relaxation processes on the ground states of 87Rb atoms with lamp and laser pumping. The breadboards of discriminators operating with cells filled by a buffer gas mixture and with wall-coating will be developed, studied and optimized both theoretically and experimentally. The most efficient excitation schemes in Rb discriminator based on the CPT effect will be studied. A theoretical basis for developing atomic frequency discriminators based on gas cell - with anti-relaxation wall-coating or with buffer gases - will be developed. For the realization of the stated goals, computer programs for multi-factor optimization of Rb laser-pumped atomic vapour frequency discriminator based on CPT effect as well as on double radio-optical resonance for both cells with wall-coating and those without it for achieving the highest short-term frequency stability of standard will be developed and used. As a result, it is expected that the method of laser pumping with using the cells filled by a buffer gas optimized mix and with wall-coating will improve the stability of atomic frequency standards down to below 1.10-12 on one second and below 1.10-14 on one day. The phenomena of CPT will be investigated in order to estimate the possibility of frequency stability improvement of Rb gas cell standard down to the same specifications.
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NEUCHÂTEL
Suiza