Atomic micro-clock of the type operating in a pulsed regime

摘要

Pulse mode CPT atomic micro-clock (200) comprising: a local oscillator (125); a dual-frequency laser source (102); means (300) configured to pulse the output signal of the source, according to a Ramsey type interrogation sequence (144) comprising pulses of duration T1 separated by intervals of duration T2; an alkaline steam microcell; a photodiode (105); a control loop (500) of the microwave frequency of the local oscillator; and a control loop (400 ') of the optical frequency of the source by means of a pulse control unit (SERVO_2') receiving the output signal of the photodiode and the interrogation sequence, and providing a correction signal ( δ_c_2 ') at the source. During the period T1, the block (SERVO_2 ’) extracts an error signal from the output signal of the photodiode and generates the correction signal from the error signal. During the period T2, it forces the error signal to zero and generates the correction signal by extrapolation. Figure for the abstract: figure 6