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Agenda

Agenda. Last class review Example: Rabi flopping Calculating < r > part 1 Including dephasing and relaxation ASIDE: Problem set #5 due November 24 th . Reading for next class: M.E. pp 255-258. M.E.: 193-195. M.E.: 200-205. M.E.: 211-212. E 2. E 1. 2. Last class review.

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Agenda

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  1. Agenda • Last class review • Example: Rabi flopping • Calculating <r> part 1 • Including dephasing and relaxation ASIDE: Problem set #5 due November 24th. Reading for next class: M.E. pp 255-258 M.E.: 193-195 M.E.: 200-205 M.E.: 211-212 Laser Optics – Phys460

  2. E2 E1 2. Last class review Specific case: light interacting with a two-level atom Rabi flopping! Laser Optics – Phys460

  3. 1. Review, cont. Driving field off resonance: New “flopping” frequency: Recall what we are looking for: induced dipole! <r> -expectation value of displacement operator Laser Optics – Phys460

  4. E.g., Rabi flopping • Show that the units of are s-1. • A two level system with is driven by a monochromatic optical beam (polarized direction and intensity 1W/cm2) that is resonant to the two-level system. What is the corresponding Rabi flopping period? • Why is it hard to observe Rabi flopping in a condensed matter system? “Rabi frequency”! Laser Optics – Phys460

  5. 2. But what is <r>? For fun: what is ? M.E.pg 194 Low excitation regime: Method to calculate oscillator strength! Recall Lorentz model: Laser Optics – Phys460

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