Abstract
The characteristics of coherent population trapping (CPT) signal were investigated in small-size glass vapor cells containing [Formula: see text]Rb and Ne buffer gas with narrow line-width laser pumping on D2 line. The parameters of CPT signals were measured using small-size vapor cells with Ne buffer gas pressure in the range of 200–400 Torr, cell temperature in the range of 65–120 [Formula: see text]C and the values of laser pumping power of 30–400 [Formula: see text]W/cm2. Optimal conditions, under which the minimal value of short-term instability of resonance line is achieved, were obtained in experiments. Orientation frequency shifts of CPT resonance using glass [Formula: see text]Rb vapor cells containing buffer gas and anti-relaxation coating were compared. CPT signals using vapor cells based on integrated technologies containing [Formula: see text]Rb in atmosphere of Ne were also investigated. The CPT signals with typical line widths of 2–3 kHz and signal-to-noise ratio of 1500 in 1 Hz bandwidth are observed, which allows one to provide relative frequency instability of 10[Formula: see text] at 100 s.
Highlights
The development of modern methods of resonance signals inducing in optically oriented alkali atoms, such as the effect of coherent population trapping (CPT), and the progress in the establishment of coherent light sources with high stability have made possible the creation of a new generation of miniature quantum devices with optical pumping.[1]
Such devices include miniature Mx magnetometers[2] with sensitivity of 5 pT/Hz1/2 and small-size quantum frequency standards based on alkali vapor cells (87Rb, 133Cs) with physical package volume less than 20 cm[3] and relative frequency instability at the level of 10−11 s−1/2.3–5 Metrological characteristics of such devices are largely determined by the choice of the working alkali atoms, by the technology and the fabrication quality of the working vapor cell and by the parameters of the pumping source
In experiments we obtained the optimal values of the buffer gas pressure in the alkali vapor cell, the temperature of the cell and the intensity of the laser pumping radiation corresponding to maximal quality factor of CPT signal
Summary
The development of modern methods of resonance signals inducing in optically oriented alkali atoms, such as the effect of coherent population trapping (CPT), and the progress in the establishment of coherent light sources with high stability have made possible the creation of a new generation of miniature quantum devices with optical pumping.[1]. This inevitably causes the problem of the shift and broadening of resonance absorption line, which requires careful selection and adjustment of all elements of the physical package of a quantum device, which allows one to implement the minimum measuring error
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