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Narrow and contrast resonance of increased absorption in Λ-system observed in Rb cell with buffer gas

Armen D. Sargsyan, A. Papoyan, A. S. Sarkisyan, Yuri P. Malakyan, G. G. Grigoryan, David G. Sarkisyan, Claude Leroy, Y. Pashayan-Leroy

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

We report observation of a narrow (sub-natural) and high-contrast resonance of increased absorption (“bright” resonance) in Rb cell with Ne buffer gas under previously unexplored experimental conditions for coupling and probe radiation configuration. The coupling laser-stabilized frequency is detuned by ~3 GHz from 5S1/2, Fg=3 → 5P3/2, Fe=2,3,4 transitions, while the probe laser frequency is scanned across these transitions. We believe the bright resonance formation, occurring when the probe laser frequency is blue-shifted from the coupling frequency by a value of the ground state hyperfine splitting, is caused predominantly by a 2-photon absorption of the probe radiation 5S1/2, Fg=2 → 5S1/2, Fg=3 with 5P3/2 as an intermediate state. We also report and interpret splitting of the bright resonance into 6 well resolved and contrast components in moderate magnetic fields (B ~ 10 ÷ 250 G).

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Narrow and contrast resonance of increased absorption in Lambda-system observed in Rb cell with buffer gas

Armen D. Sargsyan, A. Papoyan, A. S. Sarkisyan +5 more

We report observation of a narrow (sub-natural) and high-contrast resonance of increased absorption ("bright" resonance) in Rb cell with Ne buffer gas under previously unexplored experimental conditions for coupling and probe radiation configuration. The coupling laser stabilized frequency is detuned by ~ 3 GHz from 5S1/2, Fg=3 --> 5P3/2, Fe=2,3,4 transitions, while the probe laser frequency is scanned across these transitions. We believe the bright resonance formation, occurring when the probe laser frequency is blue-shifted from the coupling frequency by a value of the ground state hyperfine splitting, is caused predominantly by a 2-photon absorption of the probe radiation 5S1/2, Fg=2 --> 5S1/2, Fg=3 with 5P3/2 as an intermediate state. We also report and interpret splitting of the bright resonance into 6 well resolved and contrast components in moderate magnetic fields (B ~ 10 - 250 G).

arXiv:0902.1319•Feb 8, 2009•1 citation

Splitting of the electromagnetically induced transparency resonance on 85Rb atoms in strong magnetic fields up to the Paschen-Back regime

Armen D. Sargsyan, R. Mirzoyan, David G. Sarkisyan

Electromagnetically induced transparency (EIT) resonance in strong magnetic fields of up to 1.7 kG has been investigated with the use of a 30-μm cell filled with an atomic rubidium vapor and neon as a buffer gas. The EIT resonance in the Λ system of the D 1 line of 85 Rb atoms has been formed with the use of two narrowband (∼1 MHz) 795-nm diode lasers. The EIT resonance in a longitudinal magnetic field is split into five components. It has been demonstrated that the frequencies of the five EIT components are either blue- or red-shifted with an increase in the magnetic field, depending on the frequency ν P of the probe laser. In has been shown that in both cases the 85 Rb atoms enter the hyperfine Paschen-Back regime in magnetic fields of >1 kG. The hyperfine Paschen-Back regime is manifested by the frequency slopes of all five EIT components asymptotically approaching the same fixed value. The experiment agrees well with the theory.

Journal of Experimental and Theoretical Physics Letters•Nov 1, 2012•25 citations

Simultaneous observation ofN- and EIT- resonances in 40-micron thin cell filled with Rb and buffer gas

Armen D. Sargsyan, R. Mirzoyan, S. Cartaleva +1 more

We report simultaneous observation of the N- and EIT- resonances formation using multi-region (MR) cell, which contains micrometric –thin region with the thickness L varying in the range of 1μm - 90μm. MR cell is filled with natural Rb and 150 Torr neon gas. To form N- and EIT- resonances in Λ-system, two lasers are used: the probe (with tunable frequency), and the coupling (with the fixed frequency) with λ ≈ 795 nm wavelength and 1MHz- line-width. Although, the best parameters of N-resonance could be obtained for a cell thickness about 1cm, the use of MR cell with the thickness 30-40 μm still allows to obtain a good contrast and a narrow line-width. The N-resonance demonstrates subnatural increase of the probe absorption and is formed when probe frequency νP1 is in resonance with the 85Rb transition Fg=2 →5P1/2, while for the coupling frequency the condition υC = υP1 + Δ1 (Δ1=3036 MHz) is fulfilled. The EITresonance is formed when νP2 scans the transition 87Rb, Fg=2 →5P1/2 and for the same coupling frequency the condition υC = υP2 +Δ2 (Δ2=6835 MHz) should fulfill. The frequency separation between N- and EIT-resonances is equal to Δ2-Δ1≈ 3.8 GHz. We also detected the low-frequency beating signal when the condition υC ≈ νP' is fulfilled, which allows a directly determine the coupling frequency υC. Splitting of N-resonance in the external longitudinal magnetic field into five components is detected. Possible applications are addressed.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 15, 2013•0 citations

Laser spectroscopy with nanometric cells containing atomic vapor of metal: influence of buffer gas

David G. Sarkisyan, G. Hakhumyan, Armen D. Sargsyan +3 more

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.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 8, 2010•5 citations

Threshold nonlinear absorption in Zeeman transitions

Andal Narayanan, Abheera Hazra, S. N. Sandhya

We experimentally study the absorption spectroscopy from a collection of gaseous 87Rb atoms at room temperature irradiated with three fields. Two of these fields are in a pump–probe saturation absorption configuration. The third field co-propagates with the pump field. The three fields address Zeeman degenerate transitions between hyperfine levels 5S1/2, F = 1 and 5P3/2, F = 0, F = 1 around the D2 line. We find a sub-natural absorption resonance in the counter-propagating probe field for equal detunings of all three fields. This absorption arises in conjunction with the appearance of increased transmission due to electro-magnetically induced transparency in the co-propagating fields. The novel feature of this absorption is its onset only for the blue of 5P3/2, F = 0, as the laser frequency is scanned through the excited states 5P3/2, F = 0, F = 1 and F = 2. The absorption rapidly rises to near maximum values within a narrow band of frequency near 5P3/2, F = 0. Our experimental results are compared with a dressed atom model. We find the threshold absorption to be a result of coherent interaction between the dressed states of our system.

Journal of Physics B Atomic Molecular and Optical Physics•Oct 12, 2010•0 citations

Effect of Buffer Gas Influence on Magnetically-Induced Transitions in 87Rb Atoms, D2 Line

Armen D. Sargsyan, A. S. Sarkisyan, David G. Sarkisyan

Abstract Unusual magnetically-induced (MI) transitions Fg =1 → Fe = 3 of the 87Rb atoms, D2 lines, forbidden in the absence of magnetic field but becoming significant in magnetic fields >500 G have been studied. The effect of the buffer gas of neon on MI transitions was studied using the process of resonant absorption of laser radiation in a nanocell (NC) with Rb atomic vapors with an NC thickness L = 390 nm and a buffer gas of neon with the pressures of 6 and 20 Torr. The use of NC enables to achieve high spectral resolution and selectively study the MI transitions. It was found that the addition of neon to the cell results in a decrease in the amplitude of the MI transition and its spectral broadening (for some optical processes, the addition of a buffer gas results in an improvement of the parameters). The optimal power of a CW laser for the effective formation of the MI transitions was found to be equal to 10 μW.

Journal of Contemporary Physics (Armenian Academy of Sciences)•May 27, 2022•0 citations
We report observation of a narrow (sub-natural) and high-contrast resonance of increased absorption (“bright” resonance) in Rb cell with Ne buffer gas under previously unexplored experimental conditions for coupling and probe radiation configuration. The coupling laser-stabilized frequency is detuned by ~3 GHz from 5S1/2, Fg=3 → 5P3/2, Fe=2,3,4 transitions, while the probe laser frequency is scanned across these transitions. We believe the bright resonance formation, occurring when the probe laser frequency is blue-shifted from the coupling frequency by a value of the ground state hyperfine splitting, is caused predominantly by a 2-photon absorption of the probe radiation 5S1/2, Fg=2 → 5S1/2, Fg=3 with 5P3/2 as an intermediate state. We also report and interpret splitting of the bright resonance into 6 well resolved and contrast components in moderate magnetic fields (B ~ 10 ÷ 250 G).
We report observation of a narrow (sub-natural) and high-contrast resonance of increased absorption ("bright" resonance) in Rb cell with Ne buffer gas under previously unexplored experimental conditions for coupling and probe radiation configuration. The coupling laser stabilized frequency is detuned by ~ 3 GHz from 5S1/2, Fg=3 --> 5P3/2, Fe=2,3,4 transitions, while the probe laser frequency is scanned across these transitions. We believe the bright resonance formation, occurring when the probe laser frequency is blue-shifted from the coupling frequency by a value of the ground state hyperfine splitting, is caused predominantly by a 2-photon absorption of the probe radiation 5S1/2, Fg=2 --> 5S1/2, Fg=3 with 5P3/2 as an intermediate state. We also report and interpret splitting of the bright resonance into 6 well resolved and contrast components in moderate magnetic fields (B ~ 10 - 250 G).
Electromagnetically induced transparency (EIT) resonance in strong magnetic fields of up to 1.7 kG has been investigated with the use of a 30-μm cell filled with an atomic rubidium vapor and neon as a buffer gas. The EIT resonance in the Λ system of the D 1 line of 85 Rb atoms has been formed with the use of two narrowband (∼1 MHz) 795-nm diode lasers. The EIT resonance in a longitudinal magnetic field is split into five components. It has been demonstrated that the frequencies of the five EIT components are either blue- or red-shifted with an increase in the magnetic field, depending on the frequency ν P of the probe laser. In has been shown that in both cases the 85 Rb atoms enter the hyperfine Paschen-Back regime in magnetic fields of >1 kG. The hyperfine Paschen-Back regime is manifested by the frequency slopes of all five EIT components asymptotically approaching the same fixed value. The experiment agrees well with the theory.
We report simultaneous observation of the N- and EIT- resonances formation using multi-region (MR) cell, which contains micrometric –thin region with the thickness L varying in the range of 1μm - 90μm. MR cell is filled with natural Rb and 150 Torr neon gas. To form N- and EIT- resonances in Λ-system, two lasers are used: the probe (with tunable frequency), and the coupling (with the fixed frequency) with λ ≈ 795 nm wavelength and 1MHz- line-width. Although, the best parameters of N-resonance could be obtained for a cell thickness about 1cm, the use of MR cell with the thickness 30-40 μm still allows to obtain a good contrast and a narrow line-width. The N-resonance demonstrates subnatural increase of the probe absorption and is formed when probe frequency νP1 is in resonance with the 85Rb transition Fg=2 →5P1/2, while for the coupling frequency the condition υC = υP1 + Δ1 (Δ1=3036 MHz) is fulfilled. The EITresonance is formed when νP2 scans the transition 87Rb, Fg=2 →5P1/2 and for the same coupling frequency the condition υC = υP2 +Δ2 (Δ2=6835 MHz) should fulfill. The frequency separation between N- and EIT-resonances is equal to Δ2-Δ1≈ 3.8 GHz. We also detected the low-frequency beating signal when the condition υC ≈ νP' is fulfilled, which allows a directly determine the coupling frequency υC. Splitting of N-resonance in the external longitudinal magnetic field into five components is detected. Possible applications are addressed.
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.
We experimentally study the absorption spectroscopy from a collection of gaseous 87Rb atoms at room temperature irradiated with three fields. Two of these fields are in a pump–probe saturation absorption configuration. The third field co-propagates with the pump field. The three fields address Zeeman degenerate transitions between hyperfine levels 5S1/2, F = 1 and 5P3/2, F = 0, F = 1 around the D2 line. We find a sub-natural absorption resonance in the counter-propagating probe field for equal detunings of all three fields. This absorption arises in conjunction with the appearance of increased transmission due to electro-magnetically induced transparency in the co-propagating fields. The novel feature of this absorption is its onset only for the blue of 5P3/2, F = 0, as the laser frequency is scanned through the excited states 5P3/2, F = 0, F = 1 and F = 2. The absorption rapidly rises to near maximum values within a narrow band of frequency near 5P3/2, F = 0. Our experimental results are compared with a dressed atom model. We find the threshold absorption to be a result of coherent interaction between the dressed states of our system.
Abstract Unusual magnetically-induced (MI) transitions Fg =1 → Fe = 3 of the 87Rb atoms, D2 lines, forbidden in the absence of magnetic field but becoming significant in magnetic fields >500 G have been studied. The effect of the buffer gas of neon on MI transitions was studied using the process of resonant absorption of laser radiation in a nanocell (NC) with Rb atomic vapors with an NC thickness L = 390 nm and a buffer gas of neon with the pressures of 6 and 20 Torr. The use of NC enables to achieve high spectral resolution and selectively study the MI transitions. It was found that the addition of neon to the cell results in a decrease in the amplitude of the MI transition and its spectral broadening (for some optical processes, the addition of a buffer gas results in an improvement of the parameters). The optimal power of a CW laser for the effective formation of the MI transitions was found to be equal to 10 μW.