Physics – Atomic Physics
Scientific paper
2007-02-20
European Physical Journal Applied Physics, 388 (30/05/2007) 183-189
Physics
Atomic Physics
Scientific paper
10.1051/epjap:2007072
The short-term stability of passive atomic frequency standards, especially in pulsed operation, is often limited by local oscillator noise via intermodulation effects. We present an experimental demonstration of the intermodulation effect on the frequency stability of a continuous atomic fountain clock where, under normal operating conditions, it is usually too small to observe. To achieve this, we deliberately degrade the phase stability of the microwave field interrogating the clock transition. We measure the frequency stability of the locked, commercial-grade local oscillator, for two modulation schemes of the microwave field: square-wave phase modulation and square-wave frequency modulation. We observe a degradation of the stability whose dependence with the modulation frequency reproduces the theoretical predictions for the intermodulation effect. In particular no observable degradation occurs when this frequency equals the Ramsey linewidth. Additionally we show that, without added phase noise, the frequency instability presently equal to 2x10-13 at 1s, is limited by atomic shot-noise and therefore could be reduced were the atomic flux increased.
Dudle Gregor
Guéna Jocelyne
Thomann Pierre
No associations
LandOfFree
An experimental study of intermodulation effects in an atomic fountain frequency standard does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An experimental study of intermodulation effects in an atomic fountain frequency standard, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An experimental study of intermodulation effects in an atomic fountain frequency standard will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-383775