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Atmospheric pressure sensitivity of the ultrastable monolithic nonplanar ring laser has been observed in optic frequency standard experiments. Atmospheric pressure perturbations affect the frequency stability of monolithic nonplanar ring lasers about 3.7 GHz/kPa. In this paper, this susceptibility is measured and quantitatively analyzed. This phenomenon needs to be cancelled in portable device of...
We report on the development of a compact Cs cell CPT frequency standard operating in the Dicke regime. Combining a double Lambda scheme and a Ramsey interrogation, high contrast fringes whose linewidth depends on the time separating two pulses, are obtained. Compared to the continuous regime, the pulsed interrogation reduces the light shift by a factor 300 and permits to reach frequency stability...
Two 674-nm optical frequency standards based on the 2S1/2 - 2D5/2 transition in 88Sr+ are under development at NPL. Comparison of the standards allows determination of the frequency stability and reproducibility via difference frequency measurements. A relative frequency stability between the traps of ap3times10-15 over a 100 s averaging time has been observed. A compact, transportable system is also...
A new scheme of frequency calibration based on adaptive neural-fuzzy inference system (ANFIS) is proposed in this paper. In normal mode, an oven- controlled crystal oscillator (OCXO) is steered by integrating time interval counter (TIC), fuzzy controller, D/A converter, etc., such that its frequency can follow a primary cesium atomic clock. In addition, the ANFIS is applied when the system enters...
The output of a femtosecond fiber laser can be both spectrally broadened and stabilized, thereby providing a broadband coherent source in the near infrared. In the frequency domain, the result is a frequency comb with frequency stabilities at the millihertz level (relative to the reference), while in the time domain, the result is an optical pulse train with sub-femtosecond relative timing jitter...
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