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Graham R Fleming - One of the best experts on this subject based on the ideXlab platform.
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three pulse Photon Echo of finite numbers of molecules single molecule traces
Journal of Physical Chemistry B, 2013Co-Authors: Hui Dong, Graham R FlemingAbstract:In conventional bulk nonlinear spectroscopy, the contribution from molecules with different environmental conditions sometimes conceals the properties of interest and prevents the assessment of the heterogeneity of complex systems. This is especially true when exploring mechanisms of coherence loss in multicomponent systems [Ishizaki and Fleming, J. Phys. Chem. B 2011, 115, 6227]. To avoid this drawback of ensemble measurements and evaluate single-molecule behavior, a quantum theory is proposed to study the three-pulse Photon Echo signal of a two-level system in a bath and reveal the fluctuations inherent to single molecules. The current method takes advantage of the coherent state representation to understand the Photon Echo experiment in a wave function formalism rather than the reduced density matrix. Information regarding the environmental degrees of freedom (DoF) is explicitly encoded in the initial state of the system plus bath. The thermal fluctuations of the initial states induce variation of the ...
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Photon Echo studies of photosynthetic light harvesting
Photosynthesis Research, 2009Co-Authors: Elizabeth L Read, Hohjai Lee, Graham R FlemingAbstract:The broad linewidths in absorption spectra of photosynthetic complexes obscure information related to their structure and function. Photon Echo techniques represent a powerful class of time-resolved electronic spectroscopy that allow researchers to probe the interactions normally hidden under broad linewidths with sufficient time resolution to follow the fastest energy transfer events in light harvesting. Here, we outline the technical approach and applications of two types of Photon Echo experiments: the Photon Echo peak shift and two-dimensional (2D) Fourier transform Photon Echo spectroscopy. We review several extensions of these techniques to photosynthetic complexes. Photon Echo peak shift spectroscopy can be used to determine the strength of coupling between a pigment and its surrounding environment including neighboring pigments and to quantify timescales of energy transfer. Two-dimensional spectroscopy yields a frequency-resolved map of absorption and emission processes, allowing coupling interactions and energy transfer pathways to be viewed directly. Furthermore, 2D spectroscopy reveals structural information such as the relative orientations of coupled transitions. Both classes of experiments can be used to probe the quantum mechanical nature of photosynthetic light-harvesting: peak shift experiments allow quantification of correlated energetic fluctuations between pigments, while 2D techniques measure quantum beating directly, both of which indicate the extent of quantum coherence over multiple pigment sites in the protein complex. The mechanistic and structural information obtained by these techniques reveals valuable insights into the design principles of photosynthetic light-harvesting complexes, and a multitude of variations on the methods outlined here.
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femtosecond Photon Echo spectroscopy of semiconducting single walled carbon nanotubes
Nano Letters, 2008Co-Authors: Matt W Graham, Graham R FlemingAbstract:Three-pulse Photon Echo peak shift measurements were performed on semiconducting single-walled carbon nanotubes embedded in polymer matrix at room temperature. Simultaneous modeling of the peak shift data in the limit of zero-intensity and the linear absorption spectrum enable us to extract an intrinsic homogeneous line width of 178 cm -1 , an inhomogeneous width of 698 cm -1 , and a Huang-Rhys factor of 0.04 for the radial breathing mode vibration. The peak shift data when combined with two-pulse Photon Echo and pump-probe measurements allows us to determine a pure exciton dephasing time scale of 78 fs at room temperature.
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efficient simulation of three pulse Photon Echo signals with application to the determination of electronic coupling in a bacterial photosynthetic reaction center
Journal of Physical Chemistry A, 2007Co-Authors: Yuanchung Cheng, Hohjai Lee, Graham R FlemingAbstract:A time-nonlocal quantum master equation coupled with a perturbative scheme to evaluate the third-order polarization in the phase-matching direction k(s) = -k(1) + k(2) + k(3) is used to efficiently simulate three-pulse Photon-Echo signals. The present method is capable of describing Photon-Echo peak shifts including pulse overlap and bath memory effects. In addition, the method treats the non-Markovian evolution of the density matrix and the third-order polarization in a consistent manner, thus is expected to be useful in systems with rapid and complex dynamics. We apply the theoretical method to describe one- and two-color three-pulse Photon-Echo peak shift experiments performed on a bacterial photosynthetic reaction center and demonstrate that, by properly incorporating the pulse overlap effects, the method can be used to describe simultaneously all peak shift experiments and determine the electronic coupling between the localized Q(y) excitations on the bacteriopheophytin (BPhy) and accessory bateriochlorophyll (BChl) in the reaction center. A value of J = 250 cm(-1) is found for the coupling between BPhy and BChl.
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the integrated Photon Echo and solvation dynamics ii peak shifts and two dimensional Photon Echo of a coupled chromophore system
Journal of Chemical Physics, 2005Co-Authors: Minhaeng Cho, Graham R FlemingAbstract:A theoretical description of one- and two-color Photon Echo peak shifts (PEPS) and two-dimensional (2D) Photon Echo spectrum (PES) of a coupled chromophore system are presented. The effects of population relaxation in the one-exciton states on both the PEPS and the 2D PES are investigated. For values of time T shorter than the population relaxation time, a finite two-color peak shift magnitude and nonzero cross peaks in the 2D PES provide evidence of electronic coupling between the chromophores. These two distinct observables, i.e., PEPS and off-diagonal peaks, both originate from the electronic coupling. However, it is shown that the PEPS and 2D PES methods can provide complementary information on the structure-dependent nonlinear optical responses of coupled chromophore systems.
I V Yevseyev - One of the best experts on this subject based on the ideXlab platform.
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collision induced Photon Echo at the transition 0 1 in ytterbium vapor direct proof of depolarizing collision anisotropy
Physical Review A, 2011Co-Authors: N N Rubtsova, V G Goldort, V N Ishchenko, E B Khvorostov, S A Kochubei, V A Reshetov, I V YevseyevAbstract:A collision-induced Photon Echo arising at the transition $0\ensuremath{\leftrightarrow}1$ of ytterbium in the presence of heavy atomic buffer is investigated. Collision-induced Echo signal appears in the case of mutually orthogonal linear polarizations of exciting pulses and it is absent without buffer. Collision-induced Echo power grows with buffer pressure up to the maximum value and decays exponentially at further buffer pressure growth. Collision-induced Echo power is essentially less than that of the ordinary Echo generated by pulses with parallel polarizations in the same mixture, and its polarization is linear with the polarization vector directed along that of the first exciting pulse. All the properties of collision-induced Photon Echo are explained on the basis of collision relaxation dependence on the direction of active atom velocity.
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collision induced Photon Echo in ytterbium vapour
Laser Physics Letters, 2006Co-Authors: N N Rubtsova, V N Ishchenko, E B Khvorostov, S A Kochubei, I V YevseyevAbstract:Collision induced Photon Echo is observed in ytterbium vapour at the inter-combination transition (6s6p) 3P1 ↔ (6s2) 1S0 in the presence of Kr gas as buffer. Collision Echo is generated by two unidirectional resonant dye laser pulses of linear mutually orthogonal polarizations. There is practically no Echo in the absence of buffer. Photon Echo power increases with Kr pressure in the range from 0 to 20 mTorr and decreases at higher Kr pressures. Experimental results are compared with theoretical predictions accounting for relaxation matrix dependence on the direction of the velocity of active atoms.
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stimulated Photon Echo in magnetic field research for optical memory
Laser Physics Letters, 2005Co-Authors: N N Rubtsova, V N Ishchenko, E B Khvorostov, S A Kochubei, I V YevseyevAbstract:Shape correlation and magnetic field control of stimulated Photon Echo (SPE) are investigated as basic properties useful for optical data storage and treatment. The SPE polarization was investigated in ytterbium vapour at the intercombination transition (6s6p) 3P1 → (6s2) 1S0 for the first time in a wide range of longitudinal magnetic field strength. SPE was generated by three resonant laser pulses of identical linear polarization and wave vectors directed symmetrically at small angles to the axis of cylindric vapour cell. SPE polarization is close to linear one in zero magnetic field. As magnetic field increases, the SPE polarization acquires ellipticity with the ellipse axis rotated around magnetic field vector. Components of SPE polarization show oscillations versus magnetic field with higher contrast of the oscillations in the weak field.
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non faraday rotation of Photon Echo polarization in ytterbium vapor
Physical Review A, 2004Co-Authors: N N Rubtsova, V N Ishchenko, E B Khvorostov, S A Kochubei, V A Reshetov, I V YevseyevAbstract:Non-Faraday rotation of Photon-Echo polarization was investigated at the $J=1\ensuremath{\leftrightarrow}J=0$ transition in a wide range of longitudinal magnetic field strength. The Echo was generated at the intercombination transition $(6s6p)^{3}P_{1}\ensuremath{\rightarrow}(6{s}^{2})^{1}S_{0}$ of $^{174}\mathrm{Yb}$ by two resonant laser pulses of linear (parallel or mutually orthogonal) polarization. A detailed analysis of the Echo polarization performed by an angled Echo technique has shown quite different behavior in the weak and strong magnetic field limits. The Photon Echo has polarization close to linear at a magnetic field strength $\mathcal{B}\ensuremath{\leqslant}5\phantom{\rule{0.3em}{0ex}}\mathrm{G}$; its polarization plane rotates around the magnetic field vector clockwise or counterclockwise depending on the magnetic field orientation relative to the wave vector. The Photon-Echo polarization components and Echo power oscillate as functions of $\mathcal{B}$. As the magnetic field increases, the oscillations become smaller and almost disappear at a magnetic field $\mathcal{B}\ensuremath{\approx}40\phantom{\rule{0.3em}{0ex}}\mathrm{G}$; the Photon Echo does not disappear at this magnetic field, but its polarization vector no longer has a preferred orientation. Numerical calculations of the Photon Echo generated at a spectral wide line agree with the experimental behavior of the Photon-Echo polarization for an arbitrary magnetic field.
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polarization rotation of Photon Echo at j 0 1 transition in magnetic field
Laser Physics Letters, 2004Co-Authors: V N Ishchenko, N N Rubtsova, E B Khvorostov, S A Kochubei, I V YevseyevAbstract:Detailed experimental analysis of Photon Echo polarization in a longitudinal magnetic field is performed for the first time at the simplest quantum transition J = 1 ↔ J = 0 for which the non-Faraday rotation of Photon Echo polarization plane was predicted. The Echo was generated at the intercombination transition (6s6p) 3P1 → (6s2) 1S0 of 174Yb by two resonant laser pulses of linear (parallel or mutually orthogonal) polarization, and the angled Echo optical scheme was applied for the detection. At the magnetic field strength ℬ ≤ 5 G the Photon Echo has polarization very close to linear one; its polarization plane rotates around magnetic field vector, and Photon Echo polarization components and integral Echo power oscillate versus ℬ from its maximum value to zero, in agreement with theory. At a stronger magnetic field ℬ ~ 40 G Photon Echo power oscillations disappear, no preferable orientation of polarization vector is observed; the fluctuations of exciting radiation spectrum are supposed to be responsible for this "non-polarized" Echo.
N N Rubtsova - One of the best experts on this subject based on the ideXlab platform.
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Kinetics of a Collision-Induced Photon Echo
Journal of Experimental and Theoretical Physics, 2019Co-Authors: N N Rubtsova, E B Khvorostov, S A Kochubei, V A ReshetovAbstract:The nonmonotonic kinetics of a collision-induced Photon Echo has been investigated for a number of buffer atoms. The collision-induced Photon Echo was generated at the ^174Yb (6 s ^2) ^1 S _0 ↔ (6 s 6 p ) 3 P _1 (0 ↔ 1) transition by a pair of linearly and mutually orthogonally polarized resonant radiation pulses in ytterbium vapor and its mixtures with He, Ne, Ar, Kr, and Xe. The kinetics of the conventional Photon Echo generated by pulses with identical linear polarizations was recorded in the same mixtures. The derived decay rate constants for both types of Echo are equal to within the measurement errors. For the collisions of ^174Yb atoms between themselves and with other ytterbium isotopes in a natural mixture of isotopes, an upper limit for the anisotropy parameter has been estimated, 0.22 ± 0.07 of the Photon Echo signal decay rate.
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collision induced stimulated Photon Echo at the transition 0 1 in ytterbium application to depolarizing collisions
Laser Physics Letters, 2017Co-Authors: N N Rubtsova, V G Goldort, E B Khvorostov, S A Kochubei, V A ReshetovAbstract:A new idea based on the collision-induced stimulated Photon Echo in the presence of weak longitudinal magnetic field is applied to the depolarizing collisions research in a gaseous mixture of ytterbium vapour with xenon. Comparison of experimental data with theoretical prediction for the collision-induced stimulated Photon Echo in the weak magnetic field shows that the alignment decay rate of state 3P1 in 174Yb is higher than the orientation decay rate.
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collision induced Photon Echo at the transition 0 1 in ytterbium vapor direct proof of depolarizing collision anisotropy
Physical Review A, 2011Co-Authors: N N Rubtsova, V G Goldort, V N Ishchenko, E B Khvorostov, S A Kochubei, V A Reshetov, I V YevseyevAbstract:A collision-induced Photon Echo arising at the transition $0\ensuremath{\leftrightarrow}1$ of ytterbium in the presence of heavy atomic buffer is investigated. Collision-induced Echo signal appears in the case of mutually orthogonal linear polarizations of exciting pulses and it is absent without buffer. Collision-induced Echo power grows with buffer pressure up to the maximum value and decays exponentially at further buffer pressure growth. Collision-induced Echo power is essentially less than that of the ordinary Echo generated by pulses with parallel polarizations in the same mixture, and its polarization is linear with the polarization vector directed along that of the first exciting pulse. All the properties of collision-induced Photon Echo are explained on the basis of collision relaxation dependence on the direction of active atom velocity.
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collision induced Photon Echo in ytterbium vapour
Laser Physics Letters, 2006Co-Authors: N N Rubtsova, V N Ishchenko, E B Khvorostov, S A Kochubei, I V YevseyevAbstract:Collision induced Photon Echo is observed in ytterbium vapour at the inter-combination transition (6s6p) 3P1 ↔ (6s2) 1S0 in the presence of Kr gas as buffer. Collision Echo is generated by two unidirectional resonant dye laser pulses of linear mutually orthogonal polarizations. There is practically no Echo in the absence of buffer. Photon Echo power increases with Kr pressure in the range from 0 to 20 mTorr and decreases at higher Kr pressures. Experimental results are compared with theoretical predictions accounting for relaxation matrix dependence on the direction of the velocity of active atoms.
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stimulated Photon Echo in magnetic field research for optical memory
Laser Physics Letters, 2005Co-Authors: N N Rubtsova, V N Ishchenko, E B Khvorostov, S A Kochubei, I V YevseyevAbstract:Shape correlation and magnetic field control of stimulated Photon Echo (SPE) are investigated as basic properties useful for optical data storage and treatment. The SPE polarization was investigated in ytterbium vapour at the intercombination transition (6s6p) 3P1 → (6s2) 1S0 for the first time in a wide range of longitudinal magnetic field strength. SPE was generated by three resonant laser pulses of identical linear polarization and wave vectors directed symmetrically at small angles to the axis of cylindric vapour cell. SPE polarization is close to linear one in zero magnetic field. As magnetic field increases, the SPE polarization acquires ellipticity with the ellipse axis rotated around magnetic field vector. Components of SPE polarization show oscillations versus magnetic field with higher contrast of the oscillations in the weak field.
S. V. Poltavtsev - One of the best experts on this subject based on the ideXlab platform.
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accurate Photon Echo timing by optical freezing of exciton dephasing and rephasing in quantum dots
Communications in Physics, 2020Co-Authors: S. V. Poltavtsev, A N Kosarev, Hendrik Rose, Matthias Reichelt, Christian Schneider, Martin Kamp, Sven HoflingAbstract:Semiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in Photon Echoes carrying complete information about the coherent ensemble dynamics. Control of the Echo emission time is mandatory for applications. Here, we propose a concept to reach this goal. In a two-pulse Photon Echo sequence, we apply an additional resonant control pulse with multiple of 2π area. Depending on its arrival time, the control slows down dephasing or rephasing of the exciton ensemble during its action. We demonstrate for self-assembled (In,Ga)As quantum dots that the Photon Echo emission time can be retarded or advanced by up to 5 ps relative to its nominal appearance time without control. This versatile protocol may be used to obtain significantly longer temporal shifts for suitably tailored control pulses. Ultrafast optical manipulation of excitons in semiconductor nanostructures offers practical access to quantum phenomena in condensed matter. The authors demonstrate a new scheme to control the exciton dephasing in large ensembles of quantum dots by application of resonant optical pulses that enable promising routes in the quest for quantum memories for information and communication technologies.
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quantum beats in the polarization of the spin dependent Photon Echo from donor bound excitons in cdte cd mg te quantum wells
Physical Review B, 2020Co-Authors: S. V. Poltavtsev, I. A. Yugova, I. A. Akimov, D. R. Yakovlev, G. Karczewski, Ia A Babenko, S ChusnutdinowAbstract:We study the quantum beats in the polarization of the Photon Echo from donor-bound exciton ensembles in semiconductor quantum wells. To induce these quantum beats, a sequence composed of a circularly polarized and a linearly polarized picosecond laser pulse in combination with an external transverse magnetic field is used. This results in an oscillatory behavior of the Photon Echo amplitude, detected in the $\sigma^+$ and $\sigma^-$ circular polarizations, occurring with opposite phases relative to each other. The beating frequency is the sum of the Larmor frequencies of the resident electron and the heavy hole when the second pulse is polarized along the magnetic field. The beating frequency is, on the other hand, the difference of these Larmor frequencies when the second pulse is polarized orthogonal to the magnetic field. The measurement of both beating frequencies serves as a method to determine precisely the in-plane hole $g$ factor, including its sign. We apply this technique to observe the quantum beats in the polarization of the Photon Echo from the donor-bound excitons in a 20-nm-thick CdTe/Cd$_{0.76}$Mg$_{0.24}$Te quantum well. From these quantum beats we obtain the in-plane heavy hole $g$ factor $g_h=-0.143\pm0.005$.
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Polarimetry of Photon Echo on charged and neutral excitons in semiconductor quantum wells.
Scientific reports, 2019Co-Authors: S. V. Poltavtsev, Yu. V. Kapitonov, I. A. Yugova, I. A. Akimov, D. R. Yakovlev, G. Karczewski, Maciej Wiater, Tomasz Wojtowicz, Manfred BayerAbstract:Coherent optical spectroscopy such as four-wave mixing and Photon Echo generation deliver rich information on the energy levels involved in optical transitions through the analysis of polarization of the coherent response. In semiconductors, it can be applied to distinguish between different exciton complexes, which is a highly non-trivial problem in optical spectroscopy. We develop a simple approach based on Photon Echo polarimetry, in which polar plots of the Photon Echo amplitude are measured as function of the angle φ between the linear polarizations of the two exciting pulses. The rosette-like polar plots reveal a distinct difference between the neutral and charged exciton (trion) optical transitions in semiconductor nanostructures. We demonstrate this experimentally by Photon Echo polarimetry of a CdTe/(Cd, Mg)Te quantum well. The Echoes of the trion and donor-bound exciton are linearly polarized at the angle 2φ with respect to the first pulse polarization and their amplitudes are weakly dependent on φ. While on the exciton the Photon Echo is co-polarized with the second exciting pulse and its amplitude scales as cosφ.
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Photon Echo from localized excitons in semiconductor nanostructures
Physics of the Solid State, 2018Co-Authors: S. V. Poltavtsev, I. A. Yugova, I. A. Akimov, D. R. Yakovlev, Manfred BayerAbstract:An overview on Photon Echo spectroscopy under resonant excitation of the exciton complexes in semiconductor nanostructures is presented. The use of four-wave-mixing technique with the pulsed excitation and heterodyne detection allowed us to measure the coherent response of the system with the picosecond time resolution. It is shown that, for resonant selective pulsed excitation of the localized exciton complexes, the coherent signal is represented by the Photon Echoes due to the inhomogeneous broadening of the optical transitions. In case of resonant excitation of the trions or donor-bound excitons, the Zeeman splitting of the resident electron ground state levels under the applied transverse magnetic field results in quantum beats of Photon Echo amplitude at the Larmor precession frequency. Application of magnetic field makes it possible to transfer coherently the optical excitation into the spin ensemble of the resident electrons and to observe a long-lived Photon Echo signal. The described technique can be used as a high-resolution spectroscopy of the energy splittings in the ground state of the system. Next, we consider the Rabi oscillations and their damping under excitation with intensive optical pulses for the excitons complexes with a different degree of localization. It is shown that damping of the Echo signal with increase of the excitation pulse intensity is strongly manifested for excitons, while on trions and donor-bound excitons this effect is substantially weaker.
S A Kochubei - One of the best experts on this subject based on the ideXlab platform.
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Kinetics of a Collision-Induced Photon Echo
Journal of Experimental and Theoretical Physics, 2019Co-Authors: N N Rubtsova, E B Khvorostov, S A Kochubei, V A ReshetovAbstract:The nonmonotonic kinetics of a collision-induced Photon Echo has been investigated for a number of buffer atoms. The collision-induced Photon Echo was generated at the ^174Yb (6 s ^2) ^1 S _0 ↔ (6 s 6 p ) 3 P _1 (0 ↔ 1) transition by a pair of linearly and mutually orthogonally polarized resonant radiation pulses in ytterbium vapor and its mixtures with He, Ne, Ar, Kr, and Xe. The kinetics of the conventional Photon Echo generated by pulses with identical linear polarizations was recorded in the same mixtures. The derived decay rate constants for both types of Echo are equal to within the measurement errors. For the collisions of ^174Yb atoms between themselves and with other ytterbium isotopes in a natural mixture of isotopes, an upper limit for the anisotropy parameter has been estimated, 0.22 ± 0.07 of the Photon Echo signal decay rate.
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collision induced stimulated Photon Echo at the transition 0 1 in ytterbium application to depolarizing collisions
Laser Physics Letters, 2017Co-Authors: N N Rubtsova, V G Goldort, E B Khvorostov, S A Kochubei, V A ReshetovAbstract:A new idea based on the collision-induced stimulated Photon Echo in the presence of weak longitudinal magnetic field is applied to the depolarizing collisions research in a gaseous mixture of ytterbium vapour with xenon. Comparison of experimental data with theoretical prediction for the collision-induced stimulated Photon Echo in the weak magnetic field shows that the alignment decay rate of state 3P1 in 174Yb is higher than the orientation decay rate.
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collision induced Photon Echo at the transition 0 1 in ytterbium vapor direct proof of depolarizing collision anisotropy
Physical Review A, 2011Co-Authors: N N Rubtsova, V G Goldort, V N Ishchenko, E B Khvorostov, S A Kochubei, V A Reshetov, I V YevseyevAbstract:A collision-induced Photon Echo arising at the transition $0\ensuremath{\leftrightarrow}1$ of ytterbium in the presence of heavy atomic buffer is investigated. Collision-induced Echo signal appears in the case of mutually orthogonal linear polarizations of exciting pulses and it is absent without buffer. Collision-induced Echo power grows with buffer pressure up to the maximum value and decays exponentially at further buffer pressure growth. Collision-induced Echo power is essentially less than that of the ordinary Echo generated by pulses with parallel polarizations in the same mixture, and its polarization is linear with the polarization vector directed along that of the first exciting pulse. All the properties of collision-induced Photon Echo are explained on the basis of collision relaxation dependence on the direction of active atom velocity.
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collision induced Photon Echo in ytterbium vapour
Laser Physics Letters, 2006Co-Authors: N N Rubtsova, V N Ishchenko, E B Khvorostov, S A Kochubei, I V YevseyevAbstract:Collision induced Photon Echo is observed in ytterbium vapour at the inter-combination transition (6s6p) 3P1 ↔ (6s2) 1S0 in the presence of Kr gas as buffer. Collision Echo is generated by two unidirectional resonant dye laser pulses of linear mutually orthogonal polarizations. There is practically no Echo in the absence of buffer. Photon Echo power increases with Kr pressure in the range from 0 to 20 mTorr and decreases at higher Kr pressures. Experimental results are compared with theoretical predictions accounting for relaxation matrix dependence on the direction of the velocity of active atoms.
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stimulated Photon Echo in magnetic field research for optical memory
Laser Physics Letters, 2005Co-Authors: N N Rubtsova, V N Ishchenko, E B Khvorostov, S A Kochubei, I V YevseyevAbstract:Shape correlation and magnetic field control of stimulated Photon Echo (SPE) are investigated as basic properties useful for optical data storage and treatment. The SPE polarization was investigated in ytterbium vapour at the intercombination transition (6s6p) 3P1 → (6s2) 1S0 for the first time in a wide range of longitudinal magnetic field strength. SPE was generated by three resonant laser pulses of identical linear polarization and wave vectors directed symmetrically at small angles to the axis of cylindric vapour cell. SPE polarization is close to linear one in zero magnetic field. As magnetic field increases, the SPE polarization acquires ellipticity with the ellipse axis rotated around magnetic field vector. Components of SPE polarization show oscillations versus magnetic field with higher contrast of the oscillations in the weak field.