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Measuring the Density of Atoms in a Magneto-Optical Trap

Measuring the Density of Atoms in a Magneto-Optical Trap. Cameron Cook Advisors: Dr. Brett DePaola Dr. Larry Weaver Kansas State University REU 2010. The Goal. Become familiar with the MOT(magneto optical trap) lab

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Measuring the Density of Atoms in a Magneto-Optical Trap

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  1. Measuring the Density of Atoms in a Magneto-Optical Trap Cameron Cook Advisors: Dr. Brett DePaola Dr. Larry Weaver Kansas State University REU 2010

  2. The Goal • Become familiar with the MOT(magneto optical trap) lab • Find a method that will measure the MOT’s atomic density quickly, accurately, and in a manner that is easily reproducible • Calibrate digital CCD camera to laser intensity • Why do we want to know density?

  3. 87Rb Hyperfine Structure • Nuclear spin, I=3/2

  4. What is a magneto-optical trap? • Need active medium = 87Rb • Optical=2 lasers • Magneto = 2 Anti-Hemholtzcoils Temperature=150µK Chamber pressure=10-11Torr Approx. Density 1010 atoms/cm3

  5. BASEX inversion Camera image • BASEX (BAsis Set EXpansion) forces axis of symmetry from raw to inversion Test image

  6. BASEX accuracy • Induced an Abel transform on BASEX’S inversion • Result is deconstructed 2-D plot • Error ranges from 2% - 35%

  7. Vrakking iterative method invert deconstruct Percent error

  8. Camera Calibration • Spatial: compare distance between plates to distance in pixels

  9. Camera calibration Intensity calibration neutral density filter (ND3.0) Diverging lens power meter iris laser camera

  10. Camera calibration • Shutter speed linear • Gain function is exponential

  11. Results k = 1.16·1012 counts/nW From previous work, we know the ratio of About 1019 photons/second hitting camera

  12. Thanks to Dr. Brett DePaola, Dr. Larry Weaver, BachanaLomsadze, Hyounuk Jang, Vince Needham, Kristan Corwin, Kansas State University, and the National Science Foundation

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