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Blue MOT Trap atom number Loading Rate Zeeman slower flux

Blue MOT Trap atom number Loading Rate Zeeman slower flux. Trapped atom number. Trap laser (6 mW - 1 cm diameter) x 6 - G /2 detuned to 171Yb 1P1. PMT = 5 V @ v con = 0.3 V. Zeeman slower. oven. D=15 cm. Lens f=7.5 cm, diameter d=2.54 cm. Power meter = 0.3 m W. G  n . n .

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Blue MOT Trap atom number Loading Rate Zeeman slower flux

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  1. Blue MOT Trap atom number Loading RateZeeman slower flux

  2. Trapped atom number Trap laser (6 mW - 1 cm diameter) x 6 -G/2 detuned to 171Yb 1P1 PMT = 5 V @ vcon= 0.3 V Zeeman slower oven D=15 cm Lens f=7.5 cm, diameter d=2.54 cm Power meter = 0.3 mW

  3. Gn n = 0.14

  4. Flux measurement Trap laser (6 mW - 1 cm diameter) x 2 0 Hz detuned to 171Yb 1P1 PMT = ~ 2 V @ vcon= 0.608 V Zeeman slower oven Fluorescent power of atomic beam is too weak to be measured by power meter, thus a calibrated PMT was used. Calibration reference PMT = 5 V @ vcon= 0.300 V  P = 0.3 W However PMT gain varies with control voltage, thus PMT gain with control voltage was measured.

  5. PMT gain with control voltage PMT voltage (V) is normalized to be 1 volt when control voltage is 0.2 V

  6. Gain ratio =189

  7. Atomic beam fluorescence • What was measured is the number of atoms inside interaction volume. • 2. What is to be measured is the loading rate of MOT, which is the flux of atomic beam. • Flux is always preserved while the speed of atoms vary with Zeeman slower. • Flux varies only with oven temperature. • The number of atoms inside interaction volume varies with the speed of atoms.

  8. Total number of atoms interacting with probe laser F is flux of atomic beam : N cm-2s-1 A is area of interaction L is interacting length v is velocity of atoms Density of atoms interacting with probe laser n=N/cm-3

  9. PMT signal : 2 V @ vcon=0.608 V  0.011 V @ vcon=0.300 V  0.00066 W Gn =0) = 0.1 n = 1.4 /cm2 = 1.54 = 30000 cm/s = 1.5

  10. Loading rate from MOT experiment N atoms = 3X107 ( pmt signal 6 v) Loading rate = = 4.8 =0.032 3.2 % of atoms are trapped. Atoms may defuse out by Zeeman slower. Only a small fraction of slowed atoms can reach MOT region.

  11. Zeeman slowed Atom density Atom density) variation by a contribution of slowed atom of n()= We can know the value of by comparing the PMT signal of the table =

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