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Wyświetlanie 1-15 z 21
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:
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:
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:
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:
Realisation of Transparency below the One-Photon Absorption Level for a Coupling Laser Driving a Lambda System under EIT Conditions
Autorzy:
Spani Molella, L.
Rinkleff, R.-H.
Danzmann, K.
Powiązania:
https://bibliotekanauki.pl/articles/2047834.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
42.62.Fi
Opis:
The concept of parametric spectra in electromagnetically induced transparency is clarified. In this context, the possibility for a coupling laser to reach absorption levels below the one-photon absorption is experimentally shown. In this sense, the first results of electromagnetically induced transparency for a coupling laser in a coherent-population-trapping dominated system are presented.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 847-851
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
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
Tytuł:
Superluminal Pulse Propagation in a One-Sided Nanomechanical Cavity System
Autorzy:
Tarhan, D.
Powiązania:
https://bibliotekanauki.pl/articles/1399500.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
42.50.Ct
42.50.Wk
Opis:
We investigate the propagation of a pulse field in an optomechanical system. We examine the question of advance of the pulse under the conditions of electromagnetically induced transparency in the mechanical system contained in a high quality cavity. We show that the group delay can be controlled by the power of the coupling field. The time delay is negative which corresponds to superluminal light when there is a strong coupling between the nano-oscillator and the cavity.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 46-49
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:
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:
Zeeman Coherences Narrowing due to Ramsey Effects Induced by Thermal Motion of Rubidium Atoms
Autorzy:
Grujić, Z.
Mijailović, M.
Panić, B.
Minić, M.
Kovačević, A.
Obradović, M.
Jelenković, B.
Cartaleva, S.
Powiązania:
https://bibliotekanauki.pl/articles/1814392.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
32.70.Jz
Opis:
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.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 799-803
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:
Three-Colour Excitation of D$\text{}_{1}$ Transition in Cold Rubidium Atoms
Autorzy:
Alhasan, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047289.pdf
Data publikacji:
2007-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
42.50.Hz
42.65.-k
Opis:
We analyse the three-colour electromagnetically induced transparency for the D$\text{}_{1}$ transition in cold $\text{}^{87}$Rb atoms. We report an enhancement of the electromagnetically induced emission of a drive field as an exclusive enhancement of the third- and fourth-rank components of the density matrix. Moreover, the gain experienced by the drive field is attributed to the influence of the quantum switching effect on the increased absorption of the probe field. The electromagnetically induced emission effect is employed to generate slow light Gaussian-wave trains with shape preserving. These soliton trains were not only generated in the drive channel as has been designated but also in the switch channel which reveals multiple-light storage phenomenon.
Źródło:
Acta Physica Polonica A; 2007, 111, 3; 299-321
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:
Propagation of Double Resonance and Dark Area
Autorzy:
Eberly, J. H.
Kozlov, V. V.
Powiązania:
https://bibliotekanauki.pl/articles/2030482.pdf
Data publikacji:
2002-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.-p
42.50.Dv
42.50.Lc
42.50.Gy
Opis:
We report new results in propagation of two coherently coupled optical pulses in an inhomogeneously broadened three-level lambda medium.
Źródło:
Acta Physica Polonica A; 2002, 101, 3; 459-462
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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