QUANTUM INTERFERENCE PHENOMENON IN THE COLD ATOMIC CASCADE SYSTEM
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Date
2007
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
By using the technique of electromagnetically induced transparency(EIT), we have observed the quantum interference phenomenon in the lower-lying atomic Rydberg states of cold Cs atom in a magneto-optical trap (MOT) with typical atom numbers up to $1\times 10^{7}$, and cloud temperature about 100$\mu$K. In our experiments, a grating feedback diode laser is frequency stabilized on the Cs atom via Doppler-free saturation absorption transition $\ 6s ^{2}S_{1/2}, F=4> \rightarrow 6p ^{2}P_{3/2} , F^{\prime }=5>$, and a tunable Ti:Sapphire laser scans across the $\ 6p ^{2}P_{3/2}, F^{\prime }=5> \rightarrow 8s ^{2}S_{1/2}, F^{\prime\prime }=4>$ transition frequency. Both spontaneous emission fluorescence from MOT and transmission intensity of the diode laser are monitored. A subnatural linewidth signal is obtained for probing the transition of Cs $\ 6p ^{2}P_{3/2}, F^{\prime }=5> \rightarrow 8s ^{2}S_{1/2}, F^{\prime\prime }=4>$. These signals correspond to the cascade EIT among the$\ 6s ^{2}S_{1/2}, F=4> \leftrightarrow 6p ^{2}P_{3/2}, F^{\prime }=5>\leftrightarrow 8s ^{2}S_{1/2}, F^{\prime\prime }=4 >$. \vspace{1em} This project is financially sponsored by National Science Council (grand no. NSC-95-2112-M-012-MY3). \vspace{5em}
Description
Author Institution: Department of Physics, National Cheng-Kung University, Tainan 70101,Taiwan(R.O.C.); Department of Physics, National Cheng-Kung University, Tainan 70101, Taiwan(R.O.C.); Department of Physics, National Cheng-Kung University, Tainan 70101, Taiwan(R.O.C.); Department of Physics, National Cheng-Kung University, Tainan 70101, Taiwan(R.O.C.)