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Wyświetlanie 1-15 z 22
Tytuł:
All-Optical Magnetometer Based on Resonant Excitation of Rubidium Atoms by Frequency Modulated Diode Laser Light
Autorzy:
Cartaleva, S.
Karaulanov, T.
Petrov, N.
Slavov, D.
Vaseva, K.
Yanev, A.
Mijailovic, M.
Grujic, Z.
Jelenkovic, B. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047842.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
07.55.Ge
Opis:
Magnetic field and its gradient measurements based on coherent population trapping resonances at the D$\text{}_{1}$ line of $\text{}^{87}$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.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 871-876
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent Population Trapping οn the Second Resonance Line of Potassium
Autorzy:
Gozzini, S.
Cartaleva, S.
Karaulanov, T.
Lucchesini, A.
Slavov, D.
Powiązania:
https://bibliotekanauki.pl/articles/1791197.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
Opis:
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.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 492-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dark Resonances in Quantum Optics
Autorzy:
Arimondo, E.
Powiązania:
https://bibliotekanauki.pl/articles/1814045.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
Opis:
The processes occurring in three-level systems are briefly reviewed. Coherent population trapping, bright resonances, electromagnetic-induced transparency, electromagnetic-induced transparency optical clock are discussed.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 723-728
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersive Propagation of Ultraslow Pulses in an Atomic Bose-Einstein Condensate
Autorzy:
Tarhan, D.
Sefi, S.
Müstecaplıoğlu, Ö.
Powiązania:
https://bibliotekanauki.pl/articles/1492766.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Nt
42.50.Gy
81.05.Ni
Opis:
One-dimensional propagation of ultraslow optical pulses in an atomic Bose-Einstein condensate taking into account the dispersion and the spatial inhomogeneity is investigated. Analytical and semi-analytical solutions of the dispersive inhomogeneous wave equation modeling the ultraslow pulse propagation are developed and compared against the standard wave equation solvers based upon Cranck-Nicholson and pseudo-spectral methods. The role of curvature of the trapping potential of the condensate on the amount of dispersion of the ultraslow pulse is pointed out.
Źródło:
Acta Physica Polonica A; 2011, 120, 6; 992-997
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Dimple Potential on Ultraslow Light in a Bose-Einstein Condensate
Autorzy:
Tarhan, D.
Uncu, H.
Powiązania:
https://bibliotekanauki.pl/articles/1490935.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
67.85.Hj
Opis:
We investigate the propagation of ultraslow optical pulse in atomic Bose-Einstein condensate in a harmonic trap decorated with a dimple potential. The role of dimple potential on the group velocity and time delay is studied. Since we consider the interatomic scattering interactions, nonlinear Schrödinger equation or the Gross-Pitaevskii equation is used in order to get the density profile of the atomic system. We find large group delays of order 1 ms in an atomic Bose-Einstein condensate in a harmonic trap with a deep dimple potential.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 141-143
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Laser Light Ellipticity on Hanle Electromagnetically Induced Absorption Amplitude and Line Width
Autorzy:
Dimitrijević, J.
Grujić, Z.
Mijailović, M.
Arsenović, D.
Panić, B.
Jelenković, B.
Powiązania:
https://bibliotekanauki.pl/articles/1815474.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
32.70.Jz
Opis:
Using the $\text{}^2S_{1//2}$ $F_g$=2→$\text{}^2P_{3//2}$ $F_e$=3 transition in $\text{}^{87}Rb$, 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.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 841-845
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetically Induced Absorption Resonance Sign Reversal
Autorzy:
Belfi, J.
Biancalana, V.
Cartaleva, S.
Dancheva, Y.
Mariotti, E.
Moi, L.
Nasyrov, K.
Slavov, D.
Todorov, P.
Vaseva, K.
Powiązania:
https://bibliotekanauki.pl/articles/1815471.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
Opis:
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.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 823-828
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetically Induced Transparency in a Double Well Atomic Josephson Junction
Autorzy:
Weatherall, J.
Search, C.
Powiązania:
https://bibliotekanauki.pl/articles/1791182.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
03.75.Lm
Opis:
Electromagnetically induced transparency is an important tool for controlling light propagation and nonlinear wave mixing in atomic gases with potential applications ranging from quantum computing to table top tests of general relativity. Here we consider electromagnetically induced transparency in an atomic Bose-Einstein condensate trapped in a double well potential. One well is prepared as in standard electromagnetically induced transparency with a weak probe laser and control laser in a Λp configuration while tunneling between the wells provides a coherent coupling between identical electronic states in the two wells leading to the formation of spatially delocalized inter-well dressed states. The macroscopic inter-well coherence of the Bose-Einstein condensate wave function qualitatively modifies the normal electromagnetically induced transparency linear susceptibility and leads to the formation of additional absorption resonances and larger dispersion than electromagnetically induced transparency. We show that these new resonances can be interpreted in terms of the inter-well dressed states and the formation of a novel type of dark state involving the control laser and the inter-well tunneling.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 455-459
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entanglement and Statistical Properties of a System Consisting of Three-Level Atom Interacting with a Nonlinear Kerr Medium Field
Autorzy:
Abdel-Khalek, S.
Al-Rajhi, M.
Berrada, K.
Powiązania:
https://bibliotekanauki.pl/articles/1398909.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Yz
03.67.-a
42.50.Dv
42.50.Gy
Opis:
In this paper, we present a proper quantum system to perform different tasks of quantum information processing with optimal conditions. We study the populations, entanglement, and nonclassical properties of a system consisting of three level atom interacting with a nonlinear Kerr medium field constructed in the framework of generalized Heisenberg algebra. We quantify these quantities in terms of different parameters involved in the whole system considering the case of moving and stationary atom in the real experimental meaning of the coupling constant. The nonlinearity introduced by these kinds of fields play a useful role to create high amount of entanglement during the time evolution. Interestingly, the relationship between the degree of nonlinearity and robust of entanglement is explored in this present model.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1083-1088
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entropy associated with local stabilization of the pulse area in multilevel atomic media
Autorzy:
Alhasan, A.
Powiązania:
https://bibliotekanauki.pl/articles/1050884.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.-r
42.50.Gy
42.50.Hz
32.80.Qk
32.10.Fn
Opis:
This paper provides an entropy analysis to resonant and short pulses propagation in four-level atomic medium. As an example, we take D_{1} transition in rubidium ^{87}Rb atoms including hyperfine structure. We show how to construct the time dependent Bloch-metric for each optical transition in the Liouville space. Furthermore, we attempt to relate local stabilization of the pulse area to the distribution of the space-entropy.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1205-1214
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser Beam Profile Influence on Dark Hanle Resonances in Rb Vapor
Autorzy:
Krmpot, A.
Ćuk, S.
Nikolić, S.
Radonjić, M.
Grujić, Z.
Jelenković, B.
Powiązania:
https://bibliotekanauki.pl/articles/1791239.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Jz
42.50.Gy
42.62.Fi
32.30.Jc
Opis:
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 $\text{}^{87}Rb:$ $F_{g}$=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.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 563-565
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Scattering by Trapped Three-Level Atoms
Autorzy:
Krekora, P.
Mostowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1931804.pdf
Data publikacji:
1994-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
42.50.Fx
Opis:
We study the scattering of the probe light beam by randomly distributed strongly pumped atoms in a pencil-like medium. The density of atoms is assumed to be small (of the order of one atom per light wavelength), therefore the medium formed by the atoms cannot be treated as a continuous one. Such a configuration of atoms can be practically realized in atomic traps. We show that intensity of the scattered light increases with the third power of the probe beam intensity and with the second power of the number of atoms. We also show that under certain conditions the light is scattered into few cones.
Źródło:
Acta Physica Polonica A; 1994, 86, 6; 907-916
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Speed and Suspended Propagation of Light Pulses in Atomic Medium with Electromagnetically Induced Transparency
Autorzy:
Dziczek, D.
Ziętek, B.
Chwirot, S.
Powiązania:
https://bibliotekanauki.pl/articles/2038170.pdf
Data publikacji:
2004-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Qk
42.25.Bs
42.50.Gy
Opis:
Experiments on hot rubidium vapor as an atomic medium with electromagnetically induced transparency for radiation of 795 nm wavelength (D1 absorption line of rubidium) are reported. Propagation of light pulses with velocity reduced to 11.5 km/s has been observed with a significant modification of the shape of square input pulses to adapt to the spectral window of induced transparency. So-called light storage, i.e. suspension of the propagation of light pulses in the medium by temporary turn-off of the electromagnetically induced transparency state was also demonstrated. "Storage" periods of several microseconds, limited by relatively fast relaxation of atomic spin polarization in the volume of interaction of atoms with radiation, were obtained.
Źródło:
Acta Physica Polonica A; 2004, 106, 1; 13-23
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of the (3,12,12) Hexagonal Archimedean Photonic Crystal
Autorzy:
Jovanović, Ð.
Gajić, R.
Hingerl, K.
Powiązania:
https://bibliotekanauki.pl/articles/1795628.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
61.50.Ah
41.20.Jb
42.25.Bs
42.25.Gy
Opis:
We present a theoretical research of the optical properties of the (3,12,12) hexagonal 2D Archimedean photonic crystals. The structures are made of GaAs dielectric rods in air. Our research is mainly focused on analyzing symmetry properties of the modes and the appearance of the uncoupled modes which strongly affects the propagation of the wave and the optical performances of the material.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 642-644
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbative Solution of Optical Bloch Equations for Analysis of Electromagnetically Induced Absorption
Autorzy:
Dimitrijević, J.
Arsenović, D.
Jelenković, B.
Powiązania:
https://bibliotekanauki.pl/articles/1791188.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
32.70.Jz
Opis:
We study phenomenon of electromagnetically induced absorption in the Hanle configuration by solving time-dependent optical Bloch equations for the case of the closed multilevel $F_g$=1 → $F_e$=2 transition. Our model gives optical Bloch equations as a non-homogeneous system of ordinary linear differential equations. For weak laser fields (Ω ≪ Γ i.e. Rabi frequency small compared to spontaneous emission rate), a perturbative method to solve linear differential equations can be applied. Perturbative method is realized by solving (in the time-domain) higher-order corrections to the density matrix which in the sum converge to the exact solution of optical Bloch equations. By its form, each successive correction is also system of ordinary linear differential equations which depends on the solution of previous ones. Corrections are partitioned such that odd give corrections to optical coherences, while even give corrections to populations and Zeeman coherences. We present numerical results for the behavior of density matrix elements with successive corrections, and compare them with exact solution of optical Bloch equations. Electromagnetically induced absorption is observed as a 4th and higher (even) correction to populations, when behavior in respect to both time and magnetic field is viewed. Since in our method each correction depends on the solution of previous ones, we can analyze how (through mechanism of transfer of coherences and transfer of populations between Zeeman sublevels) electromagnetically induced absorption is formed. We also discuss qualitative differences in the behavior (with respect to time) of certain density matrix elements for magnetic fields "inside" and "outside" electromagnetically induced absorption resonance.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 468-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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