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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analysis of High Efficiency Electromagnetically Induced Transparency in Potassium Vapor
    Autorzy:
    Gozzini, S.
    Slavov, D.
    Cartaleva, S.
    Marmugi, L.
    Lucchesini, A.
    Tematy:
    33.57.+c
    31.15.B
    32.80.Xx
    32.50.+d
    32.60.+i
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/1791196.pdf  Link otwiera się w nowym oknie
    Opis:
    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.
    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.
    Tematy:
    42.50.Gy
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/1791197.pdf  Link otwiera się w nowym oknie
    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.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Fluorescence Spectra of Cs-Vapor Layers with Nanometric Thickness
    Autorzy:
    Vaseva, K.
    Todorov, P.
    Cartaleva, S.
    Slavov, D.
    Saltiel, S.
    Tematy:
    32.30.-r
    32.70.Jz
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/1791242.pdf  Link otwiera się w nowym oknie
    Opis:
    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.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluorescence Spectra Study in Extremely Thin Cs-Vapor Layers
    Autorzy:
    Vaseva, K.
    Todorov, P.
    Slavov, D.
    Cartaleva, S.
    Koynov, K.
    Saltiel, S.
    Tematy:
    32.30.-r
    32.70.Jz
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/2047840.pdf  Link otwiera się w nowym oknie
    Opis:
    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$\text{}_{2}$ 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.
    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.
    Tematy:
    42.50.Gy
    07.55.Ge
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/2047842.pdf  Link otwiera się w nowym oknie
    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.
    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.
    Tematy:
    42.50.Gy
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/1815471.pdf  Link otwiera się w nowym oknie
    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.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Population Loss in Closed Optical Transitions οf Rb and Cs Atoms Confined in Micrometric Thin Cells
    Autorzy:
    Biancalana, V.
    Cartaleva, S.
    Dancheva, Y.
    Gosh, P.
    Mariotti, E.
    Mitra, S.
    Moi, L.
    Petrov, N.
    Ray, B.
    Sarkisyan, D.
    Slavov, D.
    Tematy:
    32.30.-r
    32.70.Jz
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/1791199.pdf  Link otwiera się w nowym oknie
    Opis:
    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.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forty years after the first dark resonance experiment : an overview of the COSMA project results
    Autorzy:
    Sudyka, Julia
    Deans, C.
    Petrov, N.
    Marmugi, L.
    Khanbekyan, Alek.
    Rassi, D.
    Tonoyan, A.
    Cecchi, R.
    Cartaleva, S.
    Pustelny, Szymon
    Mitra, S.
    Marinelli, C.
    Wickenbrock, A.
    Wilson Gordon, A.
    Papoyan, A.
    Alipieva, E.
    Todorov, P.
    Sarkisyan, D.
    Nikolov, N.
    Zhivun, E.
    Moi, L.
    Budker, D.
    Wojciechowski, Adam
    Gateva, S.
    Stiaccini, L.
    Taslakov, M.
    Drampyan, R.
    Hussain, S.
    Entin, V.
    Krasteva, A.
    Slavov, D.
    Taskova, E. T.
    Andreeva, C.
    Mirzoyan, R.
    Shmavonyan, S.
    Sargsyan, A.
    Margalit, L.
    Biancalana, V.
    Ghosh, P. N.
    Mariotti, E.
    Renzoni, F.
    Khanbekyan, Alen
    Chapovsky, P.
    Dancheva, Y.
    Nasyrov, K. A.
    Patton, B.
    Azizbekyan, H.
    Gozzini, S.
    Dey, S.
    Gawlik, Wojciech
    Tsvetkov, S.
    Ozun, O.
    Stabrawa, Artur
    Bevilacqua, G.
    Ray, B.
    Wydawca:
    Society of Photo-Optical Instrumentation Engineers
    Opis:
    COSMA: Coherent Optics Sensors for Medical Application is an European Marie Curie Project running from 2012 to March 2016, with the participation of 10 teams from Armenia, Bulgaria, India, Israel, Italy, Poland, Russia, UK, USA. The main objective was to focus theoretical and experimental research on biomagnetism phenomena, with the specific aim to develop all-optical sensors dedicated to their detection and suitable for applications in clinical diagnostics. The paper presents some of the most recent results obtained during the exchange visits of the involved scientists, after an introduction about the phenomenon which is the pillar of this kind of research and of many other new fields in laser spectroscopy, atomic physics, and quantum optics: the dark resonance.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Inne
      Wyświetlanie 1-8 z 8

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