V. L. Velichansky

Russian Academy of Sciences, Moskva, Moscow, Russia

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Publications (70)105.19 Total impact

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    ABSTRACT: We demonstrate a scanning fiber-optic probe for magnetic-field imaging where nitrogen-vacancy (NV) centers are coupled to an optical fiber integrated with a two-wire microwave transmission line. The electron spin of NV centers in a diamond microcrystal attached to the tip of the fiber probe is manipulated by a frequency-modulated microwave field and is initialized by laser radiation transmitted through the optical tract of the fiber probe. The two-dimensional profile of the magnetic field is imaged with a high speed and high sensitivity using the photoluminescence spin-readout return from NV centers, captured and delivered by the same optical fiber.
    Optics Letters 12/2014; 39(24). · 3.39 Impact Factor
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    ABSTRACT: We demonstrate fiber-optic magnetometry using a random ensemble of nitrogen-vacancy (NV) centers in nanodiamond coupled to a tapered optical fiber, which provides a waveguide delivery of optical fields for the initialization, polarization, and readout of the electron spin in NV centers.
    Optics Letters 12/2014; 39(23). · 3.39 Impact Factor
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    ABSTRACT: Modulation characteristics of absorption at the resonance D 1 line of cesium atoms in a cell with antirelaxation coating are studied. It is experimentally shown that the minimum of the response to harmonic modulation in a certain frequency band coincides with Maxwellian velocity distribution maximum, despite the line profile distortion observed during linear frequency scanning [1]. The effect is theoretically explained.
    Bulletin of the Lebedev Physics Institute 04/2014; 41(4):89-94. · 0.24 Impact Factor
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    ABSTRACT: The electron spin of nitrogen--vacancy (NV) centers in diamond offers a solid-state quantum bit and enables high-precision magnetic-field sensing on the nanoscale. Implementation of these approaches in a fiber format would offer unique opportunities for a broad range of technologies ranging from quantum information to neuroscience and bioimaging. Here, we demonstrate an ultracompact fiber-optic probe where a diamond microcrystal with a well-defined orientation of spin quantization NV axes is attached to the fiber tip, allowing the electron spins of NV centers to be manipulated, polarized, and read out through a fiber-optic waveguide integrated with a two-wire microwave transmission line. The microwave field transmitted through this line is used to manipulate the orientation of electron spins in NV centers through the electron-spin resonance tuned by an external magnetic field. The electron spin is then optically initialized and read out, with the initializing laser radiation and the photoluminescence spin-readout return from NV centers delivered by the same optical fiber.
    Scientific reports. 01/2014; 4:5362.
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    ABSTRACT: We study the peculiarities of the absorption spectra in D1,2-lines of Cs, caused by optical pumping in cells with antirelaxation coating. In these cells the internal state of the atom, which arose under optical pumping by a monochromatic laser field, is preserved with a high probability in a collision with the wall. As a result, the optical pumping action extends to the entire volume of the cell and to all the velocities of the atoms. This leads to the speed-dependent scanning distortions of the absorption line profile. The detected features should be considered when using laserpumped quantum magnetometers with antirelaxation-coated cells.
    Quantum Electronics 07/2013; 43(7):638. · 0.82 Impact Factor
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    ABSTRACT: We propose a non-standard spectroscopic technique that uses a feedback control of the input probe field parameters to significantly increase the contrast and quality factor of the atomic resonances. In particular, to apply this technique for the dark resonances we sustain the fluorescence intensity at a fixed constant level while taking the spectra process. Our method, unlike the conventional spectroscopy, does not require an optically dense medium. Theoretical analysis has been experimentally confirmed in spectroscopy of atomic rubidium vapor in which a considerable increase (one-two order) of the resonance amplitude and a 3-fold decrease of the width have been observed in optically thin medium. As a result, the quality factor of the dark resonance is increased by two orders of magnitude and its contrast reaches a record level of 260%. Different schemes, including magneto-optical Hanle spectroscopy and Doppler-free spectroscopy have also showed a performance enhancement by using the proposed technique.
    Physical Review A 01/2013; 87(6). · 3.04 Impact Factor
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    A. S. ZIBROV, A. B. MATSKO, L. HOLLBERG, V. L. VELICHANSKY
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    ABSTRACT: The refractive index of coherently driven rubidium vapour is experimentally investigated in a three-level cascade configuration using a selective reflection technique. The maximum measured resonant change in the refractive index is Δn 0.1. The selective reflection is accompanied by a four-wave-mixing process that can reach ~90% efficiency.
    Journal of Modern Optics 12/2010; March 10(2002):359-365. · 1.16 Impact Factor
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    ABSTRACT: We develop a generalized principle of EIT vector magnetometry based on high-contrast EIT-resonances and the symmetry of atom-light interaction in the linearly polarized bichromatic fields. Operation of such vector magnetometer on the D1 line of 87Rb has been demonstrated. The proposed compass-magnetometer has an increased immunity to shifts produced by quadratic Zeeman and ac-Stark effects, as well as by atom-buffer gas and atom-atom collisions. In our proof-of-principle experiment the detected sensitivity to magnetic field orientation is 10^{-3} deg/Hz^{1/2}, which is limited by laser intensity fluctuations, light polarization quality, and the magnitude of the magnetic field. Comment: 8 pages, 7 figures
    04/2010;
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    Vladimir L Velichansky, Mikhail A Gubin
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    ABSTRACT: A brief review is made of the investigations conducted at the Laboratory of Frequency Standards at the P N Lebedev Physical Institute (FIAN) Division of Quantum Radiophysics along an important line of inquiry into the development of quantum frequency standards—the elaboration of a subminiature clock based on the coherent population trapping effect in alkali metal atoms with semiconductor laser pumping (frequency stability of 10−11–10−12 for an averaging time of ~ 104 s) and compact master oscillators/optical clocks with a frequency stability of 10−14–10−15 (for an averaging time of 1 s) based on He–Ne/CH4 and fiber femtosecond lasers.
    Physics-Uspekhi 02/2010; 52(11):1153. · 1.87 Impact Factor
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    ABSTRACT: We develop a generalized principle of electromagnetically induced transparency (EIT) vector magnetometry based on high-contrast EIT resonances and the symmetry of atom-light interaction in the linearly polarized bichromatic fields. Operation of such vector magnetometer on the D1 line of 87Rb has been demonstrated. The proposed compass-magnetometer has an increased immunity to shifts produced by quadratic Zeeman and ac-Stark effects, as well as by atom-buffer gas and atom-atom collisions. In our proof-of-principle experiment the detected angular sensitivity to magnetic field orientation is 10-3 deg/Hz1/2, which is limited by laser intensity fluctuations, light polarization quality, and magnitude of the magnetic field.
    Physical Review A 01/2010; 82(3). · 3.04 Impact Factor
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    ABSTRACT: We present a joint theoretical and experimental characterization of the coherent population trapping (CPT) resonance excited on the D1 line of 87Rb atoms by bichromatic linearly polarized laser light. We observe high-contrast transmission resonances (up to 25%), which makes this excitation scheme promising for miniature all-optical atomic clock applications. We also demonstrate cancellation of the first-order light shift by proper choice of the frequencies and relative intensities of the two laser field components. Our theoretical predictions are in good agreement with the experimental results. Comment: 8 pages, 7 figures
    Physical Review A 10/2009; · 3.04 Impact Factor
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    ABSTRACT: In this paper we describe experimentally and theoretically the increase in the electromagnetically induced absorption (EIA) resonance under the influence of an additional optical field. EIA was observed on the cycling transition of the rubidium D2 line in the Hanle configuration in the presence of the second-laser field acting on an open transition coupled with a cycling one via a common ground state. We present results obtained for different polarization orientations and propagation directions of the two laser beams. A systematic theoretical analysis based on the optical Bloch equations explains most of the experimental data. A lot of attention is also paid to a qualitative understanding of the EIA—its resonance shape, amplitude, and the response to the additional optical fields.
    Phys. Rev. A. 09/2009; 80(3).
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    ABSTRACT: Short-cavity diode lasers (SCDLs) emitting at the 894-nm D1 line of caesium are developed. Low threshold currents and power consumption will make it possible to use these lasers in chip-size atomic clocks (CSACs) and magnetometers. The SCDL parameters are comparable with the parameters of surface-emitting lasers.
    Quantum Electronics 08/2009; 39(6):487. · 0.82 Impact Factor
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    ABSTRACT: The saturated absorption resonance in an atomic gas in the field of counterpropagating light waves with an arbitrary elliptical polarization is investigated. A conclusion about the peculiarities of the resonance shape is drawn from a general analysis of the symmetry of the problem. In particular, a new effect has been found: the polarization parameters of the light waves can lead to an asymmetry and shift of the resonance. These conclusions are corroborated by an approximate analytical solution for the F g = 1 → F e = 2 transition and by numerical calculations. Apart from their fundamental importance, the results obtained can have important applications in metrology (frequency and time standards).
    Journal of Experimental and Theoretical Physics 01/2009; 109(1):11-22. · 0.92 Impact Factor
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    ABSTRACT: Atomic magnetometers optically pumped with resonance lamps have been explored and used in applications for more than 40 years. After many improvements these devices have reached high level of performance and fundamental limits make further progress difficult. Development of reliable single mode diode lasers (DL) that can be tuned to D lines of alkali atoms opened new possibilities such as increasing sensitivity of magnetic field measurements in multilayer shield with applications in encephalography and cardiography or dramatic decrease of the volume and power consumption in chip scale atomic magnetometers. This paper investigates Cs Mx magnetometer and gradiometer that operate in terrestrial magnetic field. Circularly polarized radiation of extended cavity DLs and/or short cavity edge-emitting DLs has been used for optical pumping. Efficiencies of optical pumping at all hyperfine (HF) transitions of D1 and D2 lines have been measured and compared. For cells with buffer gas pressure less than 30 Torr and for the antirelaxation coated (ARC) cells all 4 HF components of the D1 line can be excited separately while for D2 the simultaneous pumping occurs via three HF sublevels of the 6P3/2. The efficiencies of laser pumping are compared with lamp pumping. The basic advantage of the laser pumping is a possibility to tune laser line to the center of absorption line for maximum efficiency or to make a proper offset to provide minimum of the noise and/or of the optical shift. For applications in cardiomagnetometry the required spatial resolution can be provided by using multichannel gradiometer.
    01/2009;
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    ABSTRACT: A Joint session of the P N Lebedev Physical Institute Research Council of the Academy of Sciences and the Scientific session of the Physical Sciences Division of the Russian Academy of Sciences and the United Physical Society of the Russian Federation was convened on 6 April 2009 to mark the 75th anniversary of the P N Lebedev Physical Institute of the Academy of Sciences (FIAN). The following papers were read to the session:(1) Mesyats G A (P N Lebedev Physical Institute RAS) "75 years of the P N Lebedev Physical Institute RAS which traces back its origin to the Physics Room of Peter the Great's Kunstkamera created 225 years ago"; (2) Bolotovskii B M (Division of Theoretical Physics, P N Lebedev Physical Institute RAS) "Vavilov–Cherenkov radiation"; (3) Kopaev Yu V (Division of Solid State Physics, P N Lebedev Physical Institute RAS) "Toroidal states in crystals"; (4) Kardashev N S (Astro-Cosmic Center of the P N Lebedev Physical Institute RAS) "Science program of the Radioastron mission"; (5) Zatsepin G T (Nuclear Research Institute RAS), Roganova T M (M V Lomonosov Moscow State University, D V Skobeltsyn Nuclear Physics Research Institute) "Cosmic ray studies"; (6) Masalov A V (Optics Division, P N Lebedev Physical Institute RAS) "Spectroscopy: from atoms to cosmic objects"; (7) Gubin M A, Velichansky V L (Division of Quantum Radiophysics, P N Lebedev Physical Institute RAS) "Small-size optical frequency standards"; (8) Dagkesamanskii R D (Radioastronomical Observatory in Pushchino of the Astro-Cosmic Center of the P N Lebedev Physical Institute RAS) "Prospects for radioastronomical research in Pushchino".Articles written on the basis of these talks are printed in this special issue of Uspekhi Fizicheskikh Nauk (Usp. Fiz. Nauk 179 (11) 1145 – 1256 (2009) [English version: Phys. Usp. 52 (11) (2009] journal. • P N Lebedev Physical Institute RAS: past, present, and future, G A Mesyats Physics-Uspekhi, 2009, Volume 52, Number 11, Pages 1084–1097 • Vavilov–Cherenkov radiation: its discovery and application, B M Bolotovskii Physics-Uspekhi, 2009, Volume 52, Number 11, Pages 1099–1110 • Toroidal ordering in crystals, Yu V Kopaev Physics-Uspekhi, 2009, Volume 52, Number 11, Pages 1111–1125 • Radioastron: a radio telescope many times the size of Earth. Research program, N S Kardashev Physics-Uspekhi, 2009, Volume 52, Number 11, Pages 1127–1137 • Cosmic ray investigations, G T Zatsepin, T M Roganova Physics-Uspekhi, 2009, Volume 52, Number 11, Pages 1139–1146 • Spectroscopy: from atoms to cosmic objects, A V Masalov Physics-Uspekhi, 2009, Volume 52, Number 11, Pages 1147–1152 • Laser frequency standards at the P N Lebedev Physical Institute, V L Velichansky, M A Gubin Physics-Uspekhi, 2009, Volume 52, Number 11, Pages 1153–1158 • The Pushchino Radio Astronomy Observatory of the P N Lebedev Physical Institute Astro Space Center: yesterday, today, and tomorrow, R D Dagkesamanskii Physics-Uspekhi, 2009, Volume 52, Number 11, Pages 1159–1167
    Physics-Uspekhi 01/2009; 52(11):1083-1083. · 1.87 Impact Factor
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    ABSTRACT: The resonance of saturated absorption in counterpropagating light fields is experimentally and theoretically studied. We focus on a case of parallel and linearly polarized waves, driving an open dipole transition in rubidium vapor. A new Doppler-free resonance within the saturated-absorption dip is revealed. The phenomenon can be gained only in absorption of strong wave in presence of weak one. The effect can not be explained basing on the previously known reasons. The results obtained can be found useful in metrology for the frequency and time standards.
    Proc SPIE 08/2008;
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    A N Kireev, E V Koval'chuk, D A Tyurikov, Vladimir L Velichansky, M A Gubin
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    ABSTRACT: A tunable colour-centre laser was used in a study of Doppler-free saturated absorption resonances at the R lines of the ν3 band of the methane molecule (λ = 3.2–3.3 μm). The spectral resolution was 300 kHz for a configuration with an intracavity absorption cell. The laser is suitable for the investigation of any of the R and Q lines of the ν3 methane band, and the long-wavelength limit of the tuning range reached the P(2) line.
    Quantum Electronics 10/2007; 24(10):839. · 0.82 Impact Factor
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    ABSTRACT: A system is developed which allows one to stabilise the diode laser frequency at any point in the vicinity of the cyclic D2-line transition in Rb in the interval from +40 to -150 MHz and to switch the laser frequency within this interval for ~1 ms. A method is proposed and realised for increasing the contrast of the reference sub-Doppler resonance observed in circularly polarised fields. The ultimate contrast of the resonance is estimated. This system can be used to study the anomalous light pressure force acting on atoms in an optical molasses. A magnetooptical trap for Rb atoms is described.
    Quantum Electronics 10/2007; 34(4):341. · 0.82 Impact Factor
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    ABSTRACT: Narrowing of the linewidth of a diode laser was achieved by an external high-Q microcavity, which was a fused silica sphere 370 μm in diameter. Coupling of the radiation in and out, and matching to a 'whispering gallery' mode of this sphere, were ensured by the method of frustrated total internal reflection. Optical feedback was provided by the Rayleigh scattering. The width of the beat-note spectra of the investigated and reference lasers did not exceed 100 kHz.
    Quantum Electronics 10/2007; 26(8):657. · 0.82 Impact Factor

Publication Stats

1k Citations
105.19 Total Impact Points

Institutions

  • 1991–2014
    • Russian Academy of Sciences
      • • Department of Quantum Radiophysics
      • • Institute of Laser Physics
      Moskva, Moscow, Russia
  • 2013
    • Russian Quantum Center
      Skolkovo, Moskovskaya, Russia
  • 2000–2007
    • Texas A&M University
      • Department of Electrical and Computer Engineering
      College Station, Texas, United States
  • 2006
    • Harvard University
      Cambridge, Massachusetts, United States
  • 1994–2003
    • National Institute of Standards and Technology
      • Time and Frequency Division
      Gaithersburg, MD, United States