Control Algorithms in Quantum Frequency Standards Based on the Effect of Coherent Population Trapping

The problem of developing control algorithms in quantum frequency standards based on the effect of coherent population trapping is considered. Development of such algorithms will make it possible to create frequency standards with metrological characteristics that are not inferior to the characteristics of rubidium frequency standards, with reduced power consumption and overall dimensions. A method of studying the dependence of the actual value and frequency instability of quantum frequency standards is provided, based on the effect of coherent population trapping from modes of operation of separate parts of the standards. Minimization of the effect on the shift of the actual value of the standard frequency was selected as the criterion for optimization of the laser injection current, the output power of the microwave generator, and the mesh temperature. Comparative analysis of the methods of modifying the radiation intensity of a surface-emitting laser with a vertical resonator was conducted, and control algorithms that take account of the features of these methods were developed. Based on these algorithms, software and tuning methods in quantum frequency standards based on the effect of coherent population trapping were developed. The results of measuring frequency instability were provided for the test sample of the standard. It is shown that control algorithms and tuning methods can qualitatively change the metrological characteristics of quantum frequency standards based on the effect of coherent population trapping.