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Optical Dipole Trap without Inhomogeneous ac Stark Broadening
JiYoungKim,JiSunLee,JoonHyukHan,D.Cho 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
We use a three-level structure of the $6S-6P-6D$ states of cesium atoms to build an optical trap where the $6S_{1/2}$ and the $6P_{3/2}$ states have the same ac Stark shift. There is no inhomogeneous broadening of the $D2$ transition inside the optical trap. The loading rate is increased as a result of improved Doppler cooling. However, the loss rate also increases, and there is no large gain in the number of trapped atoms compared with that of an optical trap with large inhomogeneous broadening. The lifetime and the temperature of the optically trapped atoms also do not depend critically on the broadening of the $D2$ resonance.