Energy Level diagram for n- 2 level atoms

1
Energy Level diagram for n- 2 level atoms
2
Radiation from an Extended Sample
Interaction with Radiation field
Raise Energy level
Destroy photon
3
Radiation from an Extended Sample
By some sort of change in basis
4
Spin operators are the same as before
Absorption or emission of a photon with momentum
k,
Radiation Rate in k direction
5
Non-linear Rayleigh scattering/superradiance
Collective scattering Dicke superradiance
Rayleigh Inouye et al., Science (1998)
6
Non-linear Rayleigh scattering/superradiance
Recoiling atoms interfere with stationary atoms
to form a diffraction grating, which then
enhances scattering into that mode
The Scattered Power
7
Dickes Superradiance?
8
Non-linear Rayleigh scattering/superradiance
Dipolar emission pattern radiates weakly along
polarization axis, collective scattering is
stronger along long axis I 1-100mW/cm2 t 50
ms
Normal decay of atoms
Superradiant decay of atoms
9
References Coherence in Spontaneous Radiation
Processes Dicke, Phys. Rev. 93 1 99
(1954) Superradiant Rayliegh Scattering from a
Bose Einstein Condensate S. Inouye, Science, 285
571 (1999) Cargese lecture notes W. Ketterle and
S. Inouye Collective enhancement and suppression
in Bose-Einstein condensates. Compte rendus de
l'académie des sciences, Série IV - Physique
Astrophysique, vol. 2, pp. 339-380 (2001)
e-print cond- mat/0101424.