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Investigation of the Fluorescence Spectra of Cs-Vapor Layers with Nanometric Thickness

100%
Vaseva K., Todorov P., Cartaleva S., Slavov D., Saltiel S.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
573-575
EN
The high resolution spectroscopy of nanometric alkali-vapor layers has been made possible through the development of extremely thin cell. We present a detailed comparison of the fluorescence profiles amplitude and width, obtained in the extremely thin cell, both theoretically and experimentally. Experiments are performed on the D_{2} line of Cs-vapor layer with thickness L = mλ, where m = 0.5, 0.75, 1, 1.25. The enhancement rate of the transition profiles width is not growing monotonously, but it is larger for L varying in the interval from L = 0.75 λ to L = λ than that varying in the interval from L = λ to L = 1.25 λ. The used theoretical model, based on the optical Bloch equations is in qualitative agreement with the experimental observations.
2
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Analysis of High Efficiency Electromagnetically Induced Transparency in Potassium Vapor

100%
Gozzini S., Slavov D., Cartaleva S., Marmugi L., Lucchesini A.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
489-491
EN
We present a rate-equation theoretical model describing the optical pumping processes on the K D_{1} line and we then discuss their influence on the electromagnetically induced transparency resonance parameters. We present also a comparison with the results of an experiment performed in cells containing pure alkali metal or added with a few torrs of buffer gas. The model shows that, in the last case, the complete Maxwellisation of the atomic population velocity distribution, along with the overlapping Doppler profiles of the transitions from the ground-states typical of K, leads to a partial compensation of optical pumping and a significant increase of the amplitude of the electromagnetically induced transparency resonances.
3
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Coherent Population Trapping οn the Second Resonance Line of Potassium

100%
Gozzini S., Cartaleva S., Karaulanov T., Lucchesini A., Slavov D.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
492-494
EN
We present the observation of coherent population trapping resonances on the second resonance line of potassium: 4s^{2}S_{1/2} → 5 p^{2}P_{3/2} with wavelength of 404.4 nm. Moreover, a transfer of the coherent population trapping resonance occurs to the excited 4p^{2}P_{1/2} and 4p^{2}P_{3/2} states of the first resonance line due to cascade transitions. This transfer is evidenced by the observation of narrow resonances at the infrared 4s^{2}S_{1/2} → 4p^{2}P_{1/2} and 4s^{2}S_{1/2} → 4 p^{2}P_{3/2} transitions when alkali excitation is performed at the 404.4 nm violet line.
4
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Fluorescence Spectra Study in Extremely Thin Cs-Vapor Layers

86%
Vaseva K., Todorov P., Slavov D., Cartaleva S., Koynov K., Saltiel S.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
865-870
EN
The high resolution spectroscopy of nanometric-thin alkali-vapor layers was made possible through the development of extremely thin cell. We have investigated the behavior of the extremely thin cell fluorescence spectra both experimentally and theoretically. Experiment is performed on the D_2 line of Cs-vapor-layer with thickness L=mλ, where m = 0.5, 0.75, 1, 1.25. For open optical transitions, the fluorescence spectra shows narrow dip on the top of the sub-Doppler-width fluorescence profile, at L≥λ. In case of closed transition, an extremely small feature in the fluorescence slightly shifted from its maximum is observed at L =(5/4)λ. The used theoretical model, based on the optical Bloch equations is in qualitative agreement with the experimental observations.
5
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Zeeman Coherences Narrowing due to Ramsey Effects Induced by Thermal Motion of Rubidium Atoms

73%
Grujić Z., Mijailović M., Panić B., Minić M., Kovačević A., Obradović M., Jelenković B., Cartaleva S.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
799-803
EN
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.
6
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All-Optical Magnetometer Based on Resonant Excitation of Rubidium Atoms by Frequency Modulated Diode Laser Light

73%
Cartaleva S., Karaulanov T., Petrov N., Slavov D., Vaseva K., Yanev A., Mijailovic M., Grujic Z., Jelenkovic B.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
871-876
EN
Magnetic field and its gradient measurements based on coherent population trapping resonances at the D_1 line of ^{87}Rb are performed by means of coupling two ground-state Zeeman sublevels belonging to different hyperfine levels to a common excited state. Two coherent laser fields with frequency difference of 6.8 GHz are used. They are produced by direct current modulation of a diode laser. The resonance splitting and broadening caused by the applied magnetic field is measured by scanning the laser modulation frequency around the ground-state hyperfine frequency.
7
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Electromagnetically Induced Absorption Resonance Sign Reversal

73%
Belfi J., Biancalana V., Cartaleva S., Dancheva Y., Mariotti E., Moi L., Nasyrov K., Slavov D., Todorov P., Vaseva K.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
823-828
EN
Experimental results are presented about the transformation of the electromagnetically induced absorption resonance into the electromagnetically induced transparency one. The role of the depolarization of the excited state on the D_2 line of Cs atoms exposed to different confinements is discussed.
8
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Population Loss in Closed Optical Transitions οf Rb and Cs Atoms Confined in Micrometric Thin Cells

59%
Biancalana V., Cartaleva S., Dancheva Y., Gosh P., Mariotti E., Mitra S., Moi L., Petrov N., Ray B., Sarkisyan D., Slavov D.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
495-497
EN
We present the first experimental observation of narrow dips in the fluorescence profiles of completely closed hyperfine transitions in Rb vapor at high atomic density, which is attributed to the depolarization of the excited state. Moreover, at low atomic density, a narrow peak on the top of the fluorescence profile is demonstrated, centered at the completely closed transition within the D_{2} line of Cs. Experiments are performed in thin (700 μm) alkali cell by single light beam spectroscopy. The cell is filled with Cs containing a small portion of Rb.
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