Abstract: Miniatured transportable optical clock has been paid much attentions in recent years as a portable instrument supporting the comparison of clocks from different stations.For an optical clock aiming to operate in vehicles when they are stopped,vibration noise shows an important influence on its frequency shift through disturbing the tilt of the beam generated by the atomic beam chamber.A novel design method of a vibration isolator applied for optical system in transportable optical clock has been proposed,including finding the quantitative relation from the vibration of the chamber base to the beam tilt and the introduced stability to the clock,measuring the real vibration of a cabinet holding the optical clock,and designing three-axis vibration isolator for the atomic beam chamber.A detailed design of a vertical vibration isolator applying TS-300 and 500BM-1 vibration isolation platform is described.It is displayed by calculation and simulation that the stability of the optical clock introduced from the beam tilt caused by vibration noise is considered to be no more than 2.94×10^-15 τ^-1/2 when the clock is placed at the center of the cabinet.Moreover,a better value of theoretical stability introduced by vibration of 1.12×10^-15 τ^-1/2 can be expected with the optimization of the sensor in the vibration isolator according to the simulated results.

Key words: Optical clock, Vibration isolator, Feedback control, Simulation