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Decoding STIRAP: The Untold Story of Ionization in Rb

Explore the fascinating world of STIRAP (Stimulated Adiabatic Rapid Passage) in Rb atoms, revealing the intricacies of photo-associative ionization. Witness the time evolution theory and experimental setup, delving into 87Rb levels and laser frequencies. Discover the theoretical foundations with Gaussian pulses and density matrix formalism, shedding light on coherent control and zero linewidth lasers. Uncover the insights, speculations, and lessons learned from this captivating journey.

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Decoding STIRAP: The Untold Story of 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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