Light at a standstill Henrik Porte

Introduction Energy scheme Setup Theoretical model Stopping light Changing the shape of the pulse Splitting the pulse E.A. Cornell: Nature 409, 461-462 (2001)

Energy level scheme C. Liu, Z. Dutton, C.H. C. Liu, Z. Dutton, C.H. Behroozi, L.V. Hau: Nature 409, 490-493 (2001)

Setup C. Liu, Z. Dutton, C.H. Behroozi, L.V. Hau: Nature 409, 490-493 (2001)

Theoretical model Electromacgnetically induced transparency Dark state Absorbtion Storing information Restoring the pulse by stimulated emission C. Liu, Z. Dutton, C.H. Behroozi, L.V. Hau: Nature 409, 490-493 (2001)

Slow light and light at a standstill C. Liu, Z. Dutton, C.H. Behroozi, L.V. Hau: Nature 409, 490-493 (2001)

Transmission through the atom cloud C. Liu, Z. Dutton, C.H. Behroozi, L.V. Hau: Nature 409, 490-493 (2001)

Changing the shape of the pulse and splitting the pulse C. Liu, Z. Dutton, C.H. Behroozi, L.V. Hau: Nature 409, 490-493 (2001)

Conclusion Light at a standstill in a cloud of ultracold atoms Change the shape of the pulse by changing the intensity of the coupling laser Split the pulse by multiple read out

Question How does the coupling laserbeam determine the refractive index of the atom cloud?