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In this papar we reported our progress toward chip-scale atomic clock (CPT) based on the 87Rb coherent population trapping (CPT) transition. During last year, we did great work in improving the performance of our CSAC, especially in frequency drift and long-term frequency stability. It is a remarkable achievement that the amplitude of the drift is around 7.0×10−12/day and long-term stability is around...
The authors demonstrate a method to implement optical frequency standard based on frequency comb and Rb two-photon transitions. This scheme is simple and robust, which can operate for more than two hours. It can also eliminate 95% of the Doppler-broadening background, and the fractional stability can reach 8.4×10−12 and 7.1×10−13 at 1 s and 1000 s. This frequency standard may be utilized in many applications,...
A new design of all fiber-based, mode-locked laser with ultra-low phase noise of −158 dBc/Hz at 1MHz is reported. Both high repetition rate optical pulses and microwave with ultra-low phase noise were generated using an injection locked actively mode-locked fiber laser. The obtained microwave showed much lower phase noise than that of the equivalent commercial synthesizer. As the laser used is all...
We demonstrate a new phase-locking technique for long-term and high-precision stabilization of mode-locked Er-fiber lasers by direct optical-microwave phase detection without high-speed photodiodes and mixers. The excellent locking performance reaches 2.1×10−18 at 4000-s averaging time.
We report a long-term stable frequency transfer experiment over a 20 km fiber link using an electronic compensation scheme. The data show that the phase drift was reduced from 1.59 ns to 6.3 ps.
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