Speaker: Luis A. Orozco
Affiliation: Joint Quantum Institute(JQI), Physics, University of Maryland
Date: Tuesday, 5 May 2026 at 12:00
Location: Seminar Room, Serrano 113b
I will present experimental studies of one and two photon transitions in an array
of Cs atoms trapped with a lattice of evanescent fields around an optical nanofiber,
a waveguide. The transitions involved in the experiment are 6S1/2, 6P3/2 and 6D5/2.
The single atom absorption is about 0.5% on the 6S1/2 to 6P3/2 transition. We use
the 6S1/2 to 6P3/2 for the one photon excitation with the laser perpendicular to the
nanofiber and observe what couples into the fiber because of the interaction with
the atoms as we change polarization, angle, and detuning. The two 883 nm photon
propagates along the nanofiber and excites the atoms from 6S1/2 to 6D5/2. We
observe two-photon Rabi oscillations while the pulse is on, and then superradiant
decay from the 6D5/2 to 6P3/2 decay at 917 nm with a less pronounced effect on
the 6P3/2 to 6S1/2 transitions at 852 nm.
This work is performed at Shanxi University in Taiyuan China with Yanting Zhao,
Dianqiang Su, Tanbin Wu, and Jian Yuan, in collaboration with Pablo Solano and
Nicolas Vera from Universidad de Concepcion, and Ana Asenjo, Silvia Cardenas,
and Edgar Guardiola from Columbia University.