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We construct a frequency stabilized extended-cavity diode laser (ECDL) at 822.5 nm wavelength that could be a reliable frequency reference. The laser frequency is locked to the Cs 6S1/2rarr8S1/2 two-photon-transition (TPT) with the Allan deviation of 4.4times10-13 (60 s). The possible systematic error is evaluated as 2 kHz.
High performance frequency standards, including cesium fountains and most optical standards, operate with pulsed measurements repeated at a fixed frequency. By introducing frequency modulation of the excitation coherent with the measurement cycle time, we have observed biases in the primary frequency standard NIST-F1 much larger than biases predicted by previous theories. We derive a theory of such...
In this paper we describe a basic experiment with the aim of developing a new type of microwave power standard that utilizes atomic resonances. The microwave field strength is determined from the oscillation of the population of atomic quantum states caused by the interaction between a microwave and Cs atoms (Rabi oscillation). A rectangular Cs glass cell was developed for this experiment and inserted...
We report preliminary results from a Cs fountain primary frequency standard operated in a regime where the collisional frequency shift is zero. This shift is of opposite sign for the two clock states. The shift is cancelled by equalizing the contributions from the two clock states by adjusting the clock state composition during the microwave interrogation. Design details of, and modifications to,...
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