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Rubidium Oscillators

Rubidium Oscillators. J. Mauricio López R. Centro Nacional de Metrología CENAM. Rubidium Oscillators. Relojes Ópticos. Rubidium. Trampa de iones de estroncio del NRC. Hyperfine enery levels of ground state of Rubidium. Energy. m F =2. m F =1. m F =0. m F =-1. Clock transition. F=2.

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Rubidium Oscillators

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  1. Rubidium Oscillators J. Mauricio López R. Centro Nacional de Metrología CENAM

  2. Rubidium Oscillators Relojes Ópticos Rubidium Trampa de iones de estroncio del NRC

  3. Hyperfine enery levels of ground state of Rubidium Energy mF=2 mF=1 mF=0 mF=-1 Clock transition F=2 F=1 Magnetic field mF=-2 mF=1 mF=0 mF=-1

  4. Optical pumping process ilustrated

  5. C field power 85Rb filter cell 87Rb lamp 87Rb Phase detec. and servo control Magnetic shield RF source Cavity at 6.834,682,613 GHz VCXO SYNTH 5 or 10 MHz

  6. Physical package of Rubidium oscillators used to be small with low energy consumption

  7. 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

  8. 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

  9. 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

  10. 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

  11. Rubidium Oscillators J. Mauricio López R. jlopez@cenam.mx Centro Nacional de Metrología CENAM

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