Title :
Cesium microwave emission without population inversion
Author :
Levi, Filippo ; Godone, Aldo ; Vanier, Jacques
Author_Institution :
Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy
fDate :
5/1/1999 12:00:00 AM
Abstract :
The use of coherent population trapping (CPT) for the realization of a Cs coherent microwave emitter without population inversion is described. Preliminary experimental results are reported regarding the radio frequency spectrum of the emitted microwave radiation, the emission profile width, and the transient behavior of the output power. This new approach, based on the coherence properties of the laser radiation, allows the implementation of a microwave frequency standard where the linear light shift is absent and the thermal noise limit for the frequency instability is below 10/sup -12/ for an integration time of 1 s.
Keywords :
caesium; frequency stability; frequency standards; masers; thermal noise; 1 s; Cs; coherence properties; coherent microwave emitter; coherent population trapping; emission profile width; emitted microwave radiation; frequency instability; laser radiation; masers; microwave frequency standard; output power; radio frequency spectrum; thermal noise limit; transient behavior; Atom optics; Atomic beams; Atomic measurements; Electrical capacitance tomography; Masers; Microwave frequencies; Optical coupling; Optical noise; Optical pumping; Stationary state;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
