Diapositiva 1

1
Rubidium Oscillators
J. Mauricio López R.
Centro Nacional de Metrología CENAM
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Rubidium Oscillators
Relojes Ópticos
Rubidium
Trampa de iones de estroncio del NRC
3
Hyperfine enery levels of ground state of Rubidium
Energy
mF2
mF1
mF0
mF-1
Clock transition
F2
F1
Magnetic field
mF-2
mF1
mF0
mF-1
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Optical pumping process ilustrated
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(No Transcript)
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Physical package of Rubidium oscillators used to
be small with low energy consumption
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Typical frequency instability for Rubidium
oscillators
-9
-10
-11
Rubidium
Log (?y(?))
-12
-13
-14
-15
-16
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Log (?), seconds
1 day
1 month
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Typical frequency instability for atomic clocks
-9
Quartz
-10
-11
Rubidium
Log (?y(?))
-12
-13
Cesium
-14
-15
Maser de hidrógeno
-16
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Log (?), seconds
1 day
1 month
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Main adventages and disadesventages of the
Rubidium oscillators
Adventages
1. Small size (about 1 liter in volume)
2 Low cost (around 500 5000 USD)
3. Low energy consumtion
4. Short warming up time (less than 30 minutes)
5. Very good short term frequency stability (less
than1 hour)
6. Long life time
7. Portable
8. Easy transportation
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Main adventages and disadesventages of the
Rubidium oscillators
Disadventages
1. Not a primary frequency standard
2. Low frequency stability in the long therm (1
day and more)
3. Could be sensitive to Earth magnetic field and
other enviromental parameters
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Rubidium Oscillators
J. Mauricio López R.
jlopez_at_cenam.mx
Centro Nacional de Metrología CENAM