Dick Effect in the Integrating Sphere Cold Atom Clock

【摘要】 The Dick effect is an important factor limiting the frequency stability of sequentially-operating atomic frequency standards. Here we study the impact of the Dick effect in the integrating sphere cold atom clock（ISCAC）. To reduce the impact of the Dick effect, a 5 MHz local oscillator with ultra-low phase noise is selected and a new microwave synthesizer is built in-house. Consequently, the phase noise of microwave signal is optimized. The contribution of the Dick effect is reduced to 2.5×10^-13τ^-1/2（τ is the integrating time）. The frequency stability of 4.6 × 10^-13τ^-1/2 is achieved. The development of this optimization can promote the space applications of the compact ISCAC.更多还原

【Abstract】 The Dick effect is an important factor limiting the frequency stability of sequentially-operating atomic frequency standards. Here we study the impact of the Dick effect in the integrating sphere cold atom clock（ISCAC）. To reduce the impact of the Dick effect, a 5 MHz local oscillator with ultra-low phase noise is selected and a new microwave synthesizer is built in-house. Consequently, the phase noise of microwave signal is optimized. The contribution of the Dick effect is reduced to 2.5×10^-13τ^-1/2（τ is the integrating time）. The frequency stability of 4.6 × 10^-13τ^-1/2 is achieved. The development of this optimization can promote the space applications of the compact ISCAC.更多还原