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cold-atoms.physics.lsa.umich

Modification to Various Projects in Raithel’s Lab Louise Niu, University of Michigan REU 2008 Advisor: Georg Raithel. http://cold-atoms.physics.lsa.umich.edu. Outline. Laser Cooling. Rb Atoms absorb photons in the laser beam Conservation of Momentum Atom slows down

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cold-atoms.physics.lsa.umich

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  1. Modification to Various Projects in Raithel’s LabLouise Niu, University of Michigan REU 2008Advisor: Georg Raithel http://cold-atoms.physics.lsa.umich.edu

  2. Outline

  3. Laser Cooling • Rb Atoms absorb photons in the laser beam • Conservation of Momentum • Atom slows down • Atom spits photons in a random direction • Continuous photon stream from one direction One dimensional laser cooling Animation Atom

  4. Magneto-Optical Trap (MOT) • 3 orthogonal pairs of counter-propagating laser beams. • Quadruple magnetic field trap atoms in the center. • Cool Rb Atoms to 1mK. (MOT)

  5. Building Compensating Magnetic Coils • Motivation: • Create bias magnetic field to adjust MOT postion for Cryo-MOT • Design & Setup: • 3-dimentional Anti-Helmholtz magnetic field • Each pair coils generates 2 gauss magnetic field in its center • Vertical direction: wrap coils on the chamber • Horizontal plane: coil form+cardboard Made by Louise !! lol

  6. Building Compensating Magnetic Coils • MATLAB Simulation:

  7. Building Compensating Magnetic Coils 1. Coil Wrapping 2. Mount Coils 3.Connect to Power Supply

  8. Testing

  9. Building Compensating Magnetic Coils

  10. Bose-Einstein Condensation (BEC) • Bosonic Atoms: having integer spin • Low temperature: very close to absolute zero (10s of nK) • Atoms are in the same lowest energy level • Atoms are absolutely identical • Act as one giant wave

  11. How to make a BEC 1.Laser cooling and trapping • 2. Turn laser light off and turn 3-D magnetic trap on • 3. Evaporative cooling: 11

  12. Building High Voltage Power Supply • Motivation: • To supply high voltage for MCP • Micro-Channel Plate: • A component to detect Ions • Phosphor screen Ions Phosphor screen

  13. Building High Voltage Power Supply Power supply High V-source Current meter Aluminum Box Power plug Power switch

  14. Building High Voltage Power Supply

  15. In addition… • Other projects: • Laser Amplifier • Pulsed Coil • Atom Laser • Software Applied: • MATLAB • Mathematica • Photoshop • Adobe Illustrator • AutoCAD

  16. Acknowledgements • Prof. Georg Raithel • Graduate Students: • Aaron Reinhard • Brenton Knuffman • Eric Paradis • Kelly Younge • Mallory Traxler • Melinda Morang • Rachel Sapiro • Rahul Mhaskar • Rui Zhang • Undergraduate Students: • Jordan Montgomery • Varun Vaidya

  17. Thanks for your attention !

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