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Laser Beam Profile Influence on Dark Hanle Resonances in Rb Vapor

100%

Krmpot A., Ćuk S., Nikolić S., Radonjić M., Grujić Z., Jelenković B.

Acta Physica Polonica A

2009

vol. 116

issue 4

563-565

Influence of two different laser beam profiles, the Gaussian and the Π (top hat) profile on the resonance line widths and amplitudes in the Hanle electromagnetically induced transparency was studied. The laser beam propagates through the vacuum Rb glass cell. Studies were done at D_1 line for the open ^{87}Rb: F_{g}=2 → F_{e}=1 transition. Hanle electromagnetically induced transparency was measured for the two beam profiles with the same total power and beam diameter and experimental results showed that Gaussian and the top hat profiles give different amplitudes and widths of the Hanle resonances. Resonances obtained from the top hat laser beam profile have lower amplitudes and higher line widths.

Effect of Laser Light Ellipticity on Hanle Electromagnetically Induced Absorption Amplitude and Line Width

100%

Dimitrijević J., Grujić Z., Mijailović M., Arsenović D., Panić B., Jelenković B.

Acta Physica Polonica A

2007

vol. 112

issue 5

841-845

Using the ^2S_{1/2} F_g=2→^2P_{3/2} F_e=3 transition in ^{87}Rb, we analyzed the interaction between the arbitrarily polarized laser light and Zeeman sublevels in the Hanle configuration. We studied theoretically and confirmed experimentally that the effect of the laser light polarization on the electromagnetically induced absorption strongly depends on the laser light power. For the same atomic transition, and for single laser light power (3 mW), it was recently shown that electromagnetically induced absorption line widths increase with polarization ellipticity and that electromagnetically induced absorption amplitude has maximum for certain laser light polarization different than linear. Here, we present results for amplitudes and widths of electromagnetically induced absorption for different laser light polarizations and for the laser light power≤ 200μW. It is verified that for small laser light power maximal electromagnetically induced absorption amplitude is for the linear polarization, whereas for larger power maximum of the electromagnetically induced absorption is at higher polarization ellipticity.

Zeeman Coherences Narrowing due to Ramsey Effects Induced by Thermal Motion of Rubidium Atoms

84%

Grujić Z., Mijailović M., Panić B., Minić M., Kovačević A., Obradović M., Jelenković B., Cartaleva S.

Acta Physica Polonica A

2007

vol. 112

issue 5

799-803

We investigated effects of spatially separated laser fields on amplitudes and widths of electromagnetically induced transparency in M-type atomic system. We have shown narrowing of the electromagnetically induced transmission resonance and therefore enhancement of medium non-linearities that can be explained by diffusion-induced Ramsey narrowing. Depending on the polarization of two laser beams, narrow probe Hanle transmission resonance changes its sign in respect of the profile obtained when the pump laser beam is off.

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3 Acta Physica Polonica A

1 2009

2 2007

3 Grujić Z.

3 Jelenković B.

2 Mijailović M.

2 Panić B.

1 Arsenović D.

1 Cartaleva S.

1 Dimitrijević J.

1 Kovačević A.

1 Krmpot A.

1 Minić M.

1 Nikolić S.

1 Obradović M.

1 Radonjić M.

1 Ćuk S.

Search results

Laser Beam Profile Influence on Dark Hanle Resonances in Rb Vapor

Effect of Laser Light Ellipticity on Hanle Electromagnetically Induced Absorption Amplitude and Line Width

Zeeman Coherences Narrowing due to Ramsey Effects Induced by Thermal Motion of Rubidium Atoms