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Photo-associative Ionization in Rb

Photo-associative Ionization in Rb. Stimulated Adiabatic Rapid Passage: STIRAP, the untold story. Marc Trachy Mudessar Shah, Alina Gearba, Hyounguk Jang, Larry Weaver, Brett DePaola. Relevant Levels of 87 Rb. 4D 5/2 F=?. 1529 nm. L2. 5P 3/2 F=3. L1. 780 nm. 5S 1/2 F=2.

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Photo-associative Ionization in Rb

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  1. Photo-associative Ionization in Rb Stimulated Adiabatic Rapid Passage: STIRAP, the untold story Marc Trachy Mudessar Shah, Alina Gearba, Hyounguk Jang, Larry Weaver, Brett DePaola

  2. Relevant Levels of 87Rb 4D5/2 F=? 1529 nm L2 5P3/2 F=3 L1 780 nm 5S1/2 F=2

  3. Description of STIRAP If No Decay Want to see time evolution!

  4. Time Evolution Theory But can we SEE it?

  5. Motivation • Toy system for (for example) KLS • Coherent control is hot • Group satisfaction • Technical Improvements • EDFA (Thanks LUMOS!) • Delay control • Detector replacement

  6. Experimental Setup

  7. 4D5/2 F=? 4d 5s 5p 1529 nm 5P3/2 F=3 780 nm 5S1/2 F=2

  8. 4D5/2 L2 5P3/2 L1 5S1/2

  9. 4D5/2 L2 5P3/2 L1 5S1/2 30 ns L1 L2

  10. 4D5/2 L2 5P3/2 L1 5S1/2 Theory (Gaussian Pulses)

  11. Theory • Density matrix formalism • Gaussian pulses • Zero linewidth lasers • Individual atoms • No collisions • No rescattering of radiation • Approximations • Rotating wave • Dipole • Near resonance (keeping it to 3 levels)

  12. Speculation on agreement • Radiation trapping • Polarization (mF) • Hyperfine separation vs detuning • Intuitive case more like CW or incoherent

  13. Lessons • Even a Toy system holds questions • Toys can be complicated • Need more levels in theory • Ready for more realistic toy systems • with CW lasers • KLS

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