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Japanese Journal of Applied Physics

Absorption of Rb-D Limes by Rb Filter Cell

Toshiharu Tako, Y. Koga, Isao Hirano, Misao Ohi

Published Nov 1, 1975• 9 citations
Publisher

Abstract

The effects of absorption of Rb-D lines are studied with the combination of natural Rb lamps and natural Rb filter cells containing nitrogen at the pressures of 100 Tori and 152 Torr. It is found that the hyperfine components of D lines effective for optical pumping is obtained with Rb atoms of natural abundance both for lamps and for cells. The optimum temperature of the filter cell is observed to be near at 60°C. The absorption coefficient of the filter cell is less than 1.5 cm -1 . The absorption cross sections obtained for three broad peaks consisting of hyper finecomponents are measured to be 10 -12 ∼10 -13 cm 2 , which is 10 2 ∼10 3 times larger than the atomic cross section of Rb in its ground state. The absorption cross sections for the filter cell with N 2 100 Torr have values a few times larger than those for the filter cell with N 2 152 Torr.

DOI
10.1143/jjap.14.1641

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 8, 2010•5 citations
The effects of absorption of Rb-D lines are studied with the combination of natural Rb lamps and natural Rb filter cells containing nitrogen at the pressures of 100 Tori and 152 Torr. It is found that the hyperfine components of D lines effective for optical pumping is obtained with Rb atoms of natural abundance both for lamps and for cells. The optimum temperature of the filter cell is observed to be near at 60°C. The absorption coefficient of the filter cell is less than 1.5 cm -1 . The absorption cross sections obtained for three broad peaks consisting of hyper finecomponents are measured to be 10 -12 ∼10 -13 cm 2 , which is 10 2 ∼10 3 times larger than the atomic cross section of Rb in its ground state. The absorption cross sections for the filter cell with N 2 100 Torr have values a few times larger than those for the filter cell with N 2 152 Torr.
This paper is concerned with experimental studies of the 87 Rb pumping light source, which is composed of a 87 Rb lamp and a 85 Rb filter cell. Spectral profiles of the pumping light were observed by means of a Fabry-Perot interferometer. Measurements were executed by using ten filter cells which contained 85 Rb atoms and various gases (N 2 , Ar and He) under various pressures. As a result, it became clear that the change of the pumping light spectrum with the filter cell temperature was specific to each cell. When we took note of the ratio and the difference of the two components of Rb D 1 line as measures of the filtering effect, the temperature dependence of these values relied on the kind and the pressure of the foreign gas.
The variation in the 87Rb D1 (λ = 794.8 nm) pumping light profiles due to 85Rb filter cell temperatures (< 80 °C) has been explained by considering both the shift and broadening of the 85Rb absorption spectrum caused by low-pressure foreign gases (< 200 Torr). The coefficients of the pressure shift and broadening by N2 gas were obtained as −8.0 ± 0.5 and 11 ± 1 MHz/Torr, respectively. The intensity ratio and difference of two peaks in the profiles were calculated in order to discuss the variation in the profiles quantitatively. The foreign gas He was examined for comparison. The absorption coefficient of Rb was also discussed.
This paper deals with the experimental studies of the rubidium (Rb) spectral lamp for the purpose of getting an excellent pumping light source for a Rb gas cell type frequency standard, or for a Rb microwave maser. Some of Rb lamps containing Ne, Ar, Kr, and Ne-Ar as a carrier gas were made by way of experiment. In order to observe the hyperfine spectrum of D1line, the Fabry-Perot type scanning interferometer was made, which is driven electrostrictively. The hyperfine components of D1line were resolved successfully. It was observed that the line which is used as a pumping source became intense as the lamp temperature was raised, and it began to be dipped and decrease, however, over the definite temperature. Also observed was that this optimum temperature differs from the temperature at which the integrated intensity of D1line shows a maximum.
Comparison of absorption and fluorescence in a nano-cell containing Rb vapor with other Rb nano-cells with addition of neon gas is presented. It is shown that the effect of collapse and revival of Dicke-type narrowing occurs for Rb nanocells containing N2 as buffer gas under 6 and 20 Torr pressure for the thickness L = λ /2 and L = where λ is the resonant λ, laser wavelength 794 nm (D1 line). Particularly for 6 Torr the line-width of the transmission spectrum for the thickness L =λ/2 is 2 times narrower than that for L = λ. For an ordinary Rb cell with L = 0.1 - 10 cm with addition of buffer gas, the velocity selective optical pumping/saturation (VSOP) resonances in saturated absorption spectra are fully suppressed when the buffer gas pressure > 0.5 Torr. A spectacular difference is that for L = λ, VSOP resonances located at the atomic transitions are still observable even when Ne pressure is ≥ 6 Torr. Narrowband fluorescence spectra of a nano-cell with L = λ/2 can be used as a convenient tool for online buffer gas pressure monitoring for the conditions when ordinary pressure gauges are unusable. Comparison of electromagnetically induced transparency (EIT) effect in a nano-cell filled with pure (without a buffer gas) Rb with another nano-cell, where buffer gas nitrogen is added, is presented. The use of N2 gas inside Rb nano-cells strongly extends the range of coupling laser detunings in which it is still possible to form EIT resonance.