Measurement of the trap parameters of ¹³³Cs cold atoms in a magneto-optical trap by external periodic perturbation

We report the trap parameters of ¹³³Cs cold atoms in a magneto-optical trap (MOT). We realized the forced damped harmonic oscillations of ¹³³Cs cold atoms by the periodic intensity modulation of the lasers counter-propagating along anti-Helmholtz coil axis. The trap parameters such as trap frequency, damping coefficient, and driving force were measured by the resonance curve, which is obtained through the vibrational amplitude of ¹³³Cs cold atoms according to modulation frequency of the laser intensity modulation. The experimental results were consistent with our theoretical model, which considers all the possible transition lines used to trap ¹³³Cs atom.