Ramsey Spectroscopy in an atomic fountain / Espectroscopia Ramsey em um chafariz atômico

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

We present some relevant aspects for the realization of a 133Cs fountain, intended to operate as a primary frequency standard to realize the definition of the second. The main goal of this work is the optimization of the experimental setup of the atomic fountain in its most critical parts: the interaction region and the detection system. Furthermore, the several phases of the optical manipulation which concern the operation cycle of an atomic fountain were also optimized. These procedures allowed us to increase the signal to noise ratio in the detection signal. When the launching velocity is about 3.39 m/s, the atoms reach the apogee about 60 cm above the capture region and spend 360 ms in the free flight zone. The atomic ensemble temperature in the detection region is about 15.5K and the population difference between the two fundamental level is measured through the Ramsey fringe with a linewidth of 1.4 Hz. This linewidth, allied to the obtained S/N resulted in the measured short-term stability of 5.18×1012. Some frequency shift as the black body radiation shift, gravitational shift, second order Doppler shift and second order Zeeman shift were measured.

ASSUNTO(S)

metrologia atomic clock césio padrão de freqüência atômico atomic frequency standar metrology cesium relógio atômico ramsey spectroscopy espectroscopia ramsey

ACESSO AO ARTIGO

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