10474820
Beschreibung
Karteikarten von Tom Schobert, aktualisiert more than 1 year ago
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Erstellt von Tom Schobert
vor etwa 7 Jahre
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| Frage | Antworten |
| Lorentzian shape(saturation broadening) | - at high intensities curve is broaderned → more photons are scattered far from resonance |
| Lambert-Beer Law (Atomic scattering cross section) | Absorption of light: I(z)=I_0 exp(-σ_10 nz) σ_10=(ħω_10 γ_10)/(2I_s ) (atomic scattering cross section) |
| Velocity selective coherent population trapping | - beyond doppler and recoil cooling - bring atom in a dark state - velocity selective because of doppler effect |
| Forces on a two level atom in a light field | spatial dependence is now taken into account |
| Dissipative Force | is used for cooling and slowing atoms (all directed light fields have this force) δ_Doppler=- (k_L ) ⃗∇; δ_eff=δ+δ_Doppler for slow velocities:(F_diss ) ⃗≈F ⃗_0-β∇ F0 is constant; rest friction force depending on sign of δ |
| Reactive Force | can be used for conservative trapping (F_react ) ⃗(r ⃗ )=-∇u_opt (r ⃗ ); conservative force |
| Dissipative vs. Reactive Force | in general a light field has a dissipative and a reactive force part for large detunings |δ|≫γ_10: (F_diss ) ⃗∝I/δ^2 F ⃗_react∝ -∇I/δ |
| two level atom | |
| optical pumping | |
| BEC Expansion | |
| Mach Zehnder Interferometer | |
| Diffraction by grating | |
| Dark States | |
| Absorption imaging of ultracold atoms | |
| BEC with attractive interactions | |
| BEC in a harmonic trap | |
| BEC in optical lattices |
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