The main research topic is the precision laser-based spectroscopy (double resonance and coherent population trapping) of Rubidium atoms in wall-coated cells in view of its application in compact, space and high performance frequency standards. During the first year, the experimental investigations will focus on the study of the double resonance (respectively coherent population trapping) signal produced by the Rubidium / Cesium atoms contained in an evacuated wall-coated glass cell and interacting with resonant electromagnetic fields. Various cell shapes and laser beam dimensions will be used and the spectroscopic studies will include a detailed analysis of the AC Stark effect (light-shift). During the second year, these signals will be optimised in view of their application in a future high performance atomic frequency standards. Both the short and the medium term frequency stability will be improved by increasing the figure of merit and minimising sensitivity of the clock signal towards variations of the external magnetic field, laser intensity and frequency, microwave power. The same wall-coated cells and wall-coating materials will be used in both double resonance and coherent population trapping schemes in order to compare these two approaches from a basic physical point of view as well as for their various potential future applications. These studies shall lead to the demonstration of state-of-the-art laboratory atomic clocks in preparation of follow-on steps towards the valorisation and technological transfer towards a new generation of compact or space atomic frequency standards, in particular for the European satellite navigation system GALILEO. In parallel with the two types of spectroscopic investigations, the problem of cell filling and coating will be addressed, in close collaboration with other laboratories and in the frame of separately funded projects. Alternative coating materials to paraffin will be evaluated in term of clock performances (stability, aging and sensitivity) and commercial attractiveness.