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Filtering Effect of the ^<87>Rb Cell Containing High Pressure Foreign Gas on ^<87>Rb Lamp Light

Isao MATSUDA, 近藤 義一, 内武 倉持, 宣徳 大浦, KONDO, Yoshikazu, Naimu Kuramochi, N. Oura

Published Jan 1, 1982• 0 citations
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Abstract

Spectral profiles of the ^<87>Rb D_1 line (λ=794.8 nm) passed through the cell are calculated to evaluate the filtering effect. Upon the calculatio, the broadening and shift of the pronle due to high pressure foreign gas are taken into account to make the cell absorb the unwanted spectral components emitted from the lamp. Filtering effect is discussed on the ^<87>Rb cell containing a pressure of 300 to 900 Torr of N_2 or He gas.

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Analysis of the effect of foreign gases in the filtering action of a ^85Rb cell

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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.

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Spectral Profiles of the87Rb Pumping Light Source

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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.

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Calculation of hyperfine-transition-frequency shifts in the ground state of rubidium

V. S. Zholnerov, Eugene Simon Polzik, S. Teplova +1 more

The frequency shifts of the (F = 2, m = 0)--(F = 3, m = 0) transition in the 5 /sup 2/S/sub 1//sub ///sub 2/ state have been calculated for the /sup 85/Rb isotope on perturbation of the unpolarized light of the D1 line (lambda = 794.7 nm) of a spectral lamp as functions of the temperature of the absorbing vapor, the pressure of the buffer gas, and the length of the cell. The change in intensity and spectral distribution in the emitted light as it passes through the cell, containing rubibium vapor, has been taken into account. Experimentally measured contour lines of standard spectral lamps were used in the calculations.

Optics and Spectroscopy•Oct 1, 1985•0 citations
Spectral profiles of the ^<87>Rb D_1 line (λ=794.8 nm) passed through the cell are calculated to evaluate the filtering effect. Upon the calculatio, the broadening and shift of the pronle due to high pressure foreign gas are taken into account to make the cell absorb the unwanted spectral components emitted from the lamp. Filtering effect is discussed on the ^<87>Rb cell containing a pressure of 300 to 900 Torr of N_2 or He 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 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.
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.
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.
The frequency shifts of the (F = 2, m = 0)--(F = 3, m = 0) transition in the 5 /sup 2/S/sub 1//sub ///sub 2/ state have been calculated for the /sup 85/Rb isotope on perturbation of the unpolarized light of the D1 line (lambda = 794.7 nm) of a spectral lamp as functions of the temperature of the absorbing vapor, the pressure of the buffer gas, and the length of the cell. The change in intensity and spectral distribution in the emitted light as it passes through the cell, containing rubibium vapor, has been taken into account. Experimentally measured contour lines of standard spectral lamps were used in the calculations.