
520 Laser-based measurements for time and frequency domain applications
Frequency
Synthesizer
Quartz
Oscillator
Servo
Feedback
-
9192631770Hz
5MHz
Getter
StateSelection
Magnets
StateDetection
Magnets
Getter
Detector
1pps
Cesium
Oven
Microwave
Interrogation
Cavity
VacuumCavity
FIGURE 7.38
Schematic setup of an early cesium beam frequency standard. (Adapted from [6].)
preparation method entails the rejection of most of the atoms entering the system. While
inside the Ramsey cavity, the cesium beam is exposed to the output signal from a quartz-
based microwave synthesizer whose frequency is tuned to the desired atomic res onance
(ν
0
= 9192631770 Hz). In this way,