Pavel G Polynkin

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• Polynkin, P. (2014). Intense femtosecond shaped laser beams for writing extended structures inside transparent dielectrics. Applied Physics A: Materials Science and Processing, 114(1), 143-149.
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  Abstract: We review recent results on the propagation and self-focusing of intense femtosecond laser pulses with shaped beam profiles in transparent dielectric media. At sufficiently high optical power, beam shaping seeds into the transverse modulation instability and results in the deterministic placement of intense laser filaments within the beam profile. Resulting spatial filament distributions may be utilized for writing complex extended structures inside transparent dielectrics. Specific examples of beam shapes we will discuss are Bessel beams, optical vortices, Bessel beams of higher order, and Airy beams. © 2013 Springer-Verlag Berlin Heidelberg.
• Kartashov, D., Ališauskas, S., Baltuška, A., Schmitt-Sody, A., Roach, W., & Polynkin, P. (2013). Remotely pumped stimulated emission at 337 nm in atmospheric nitrogen. Physical Review A - Atomic, Molecular, and Optical Physics, 88(4).
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  Abstract: We report the observation of forward-propagating UV stimulated emission in atmospheric nitrogen pumped, at a standoff distance of 2.6 m, by an energetic laser pulse at a wavelength of 1053 nm and with the duration in the picosecond range. The generated optical gain at 337 nm is seeded by third harmonic of the pump beam. This demonstration is an important step towards the development of techniques for standoff optical sensing in the atmosphere. © 2013 American Physical Society.
• Polynkin, P. (2012). Mobilities of O ₂⁺ and O ₂^- ions in femtosecond laser filaments in air. Applied Physics Letters, 101(16).
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  Abstract: The operation of the capacitive plasma probe commonly used for measurements of plasma density in laser filaments and sparks in gases is analyzed. The probe is employed to measure absolute mobilities of O 2+ and O 2- ions produced through femtosecond laser filamentation in air. © 2012 American Institute of Physics.
• Polynkin, P. G. (2012). Experimental component of the AFOSR-supported MURI program on ultrafast laser filamentation in transparent dielectric media. Proceedings of SPIE - The International Society for Optical Engineering, 8547.
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  Abstract: This paper reviews the experimental component of the US Air Force-supported Multi-University Research Initiative (MURI) on femtosecond laser filamentation in transparent dielectric media. The program comprises a coordinated effort by research groups from 6 US universities and from the multi-terawatt laser laboratory at the Kirtland Air Force Base. The goal of the program is to conduct fundamental basic research on femtosecond laser filamentation, to develop new first-principle-based models of ultrashort and ultraintense pulse propagation in transparent dielectrics and to validate these models though a comprehensive experimental campaign. © 2012 SPIE.
• Hemmer, P. R., Miles, R. B., Polynkin, P., Siebert, T., Sokolov, A. V., Spranglee, P., & Scully, M. O. (2011). Standoff spectroscopy via remote generation of a backward-propagating laser beam. Proceedings of the National Academy of Sciences of the United States of America, 108(8), 3130-3134.
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  PMID: 21297033;PMCID: PMC3044376;Abstract: In an earlier publication we demonstrated that by using pairs of pulses of different colors (e.g., red and blue) it is possible to excite a dilute ensemble of molecules such that lasing and/or gain-swept superradiance is realized in a direction toward the observer. This approach is a conceptual step toward spectroscopic probing at a distance, also known as standoff spectroscopy. In the present paper, we propose a related but simpler approach on the basis of the backward-directed lasing in optically excited dominant constituents of plain air, N2 and O2. This technique relies on the remote generation of a weakly ionized plasma channel through filamentation of an ultraintense femtosecond laser pulse. Subsequent application of an energetic nanosecond pulse or series of pulses boosts the plasma density in the seed channel via avalanche ionization. Depending on the spectral and temporal content of the driving pulses, a transient population inversion is established in either nitrogen- or oxygen-ionized molecules, thus enabling a transient gain for an optical field propagating toward the observer. This technique results in the generation of a strong, coherent, counter-propagating optical probe pulse. Such a probe, combined with a wavelength-tunable laser signal(s) propagating in the forward direction, provides a tool for various remote-sensing applications. The proposed technique can be enhanced by combining it with the gain-swept excitation approach as well as with beam shaping and adaptive optics techniques.
• Polynkin, P., & Blake, J. (2005). Polarization evolution in bent spun fiber. Journal of Lightwave Technology, 23(11), 3815-3820.
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  Abstract: Since its introduction over a decade ago, the spun birefringent single-mode optical fiber is increasingly being considered for current-sensing applications. In this paper, we study the behavior of such a fiber when it is bent into a sensing coil. We show that bending weakens the polarization-holding capability of the spun birefringent fiber and causes the average polarization state to slowly oscillate along the fiber, potentially degrading the performance of the current sensor. The amplitude of this oscillation increases with tighter bending. Both the amplitude and the period of this oscillation, which are important parameters for designing current-sensing coils, are calculated by applying an appropriate perturbation theory. An experiment confirming the theory is also reported. © 2005 IEEE.
• Polynkin, P., Arruda, J. D., & Blake, J. (2000). All-optical noise-subtraction scheme for a fiber-optic gyroscope. Optics Letters, 25(3), 147-149.
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  PMID: 18059811;Abstract: A new intensity-noise-subtraction scheme for an interferometric fiber-optic gyroscope is demonstrated. Together with the light circulating through the gyro coil, an appropriately attenuated light beam from the source coupler dead end of the gyro is directed to the gyro photodetector. When the gyro is unmodulated, or modulated with a square wave at the proper frequency, the intensity noises of the two beams bear opposite phases and interfere destructively on the detector. For an unmodulated gyro, we demonstrate an intensity noise-reduction factor of ∼35, and for the same gyro modulated with a square wave at the proper frequency, we demonstrate a reduction factor of ∼15. © 2000 Optical Society of America.
• Rose, A. H., Polynkin, P. G., & Blake, J. (2000). Electro-optic Kerr effects in spun high-birefringent fiber current sensors. Proceedings of SPIE - The International Society for Optical Engineering, 4185, 348-351.
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  Abstract: We have measured the influence of the electro-optic (EO) Kerr effect on the response of a spun high-birefringence (hi-bi) fiber current sensor in a simulated Gas Insulated System (GIS) environment. We show that the EO Kerr effect distorts the response of the sensor, and that the second-harmonic signal has a small dependence on the input polarizer angle. We also, have theoretically modeled a polarimetric current sensor using spun hi-bi fiber and compared the models to our experimental results. With the models we predict the response of a fiber current sensor in a 550 kV GIS application.
• Kozlov, V. V., Polynkin, P. G., & Scully, M. O. (1999). Resonant Raman amplification of ultrashort pulses in a V-type medium. Physical Review A - Atomic, Molecular, and Optical Physics, 59(4), 3060-3070.
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  Abstract: Propagation of a pair of ultrashort coherent pulses in a V-type medium is studied. Both pulses are supposed to be resonant with corresponding atomic transitions. It is shown that the resonant character of the atom-field interaction yields "pulse locking," in which two pulses propagate with equal group velocities. Additionally, in the presence of Raman inversion, the system exhibits resonantly enhanced gain for the probe pulse. These two effects add together to decrease the pump laser threshold intensity by orders of magnitude in comparison with conventional (far-off-resonant) Raman laser schemes. ©1999 The American Physical Society.
• Dodonov, V. V., Dremin, I. M., Man'ko, O., Man'ko, V., & Polynkin, P. G. (1998). Nonclassical field states in quantum optics and particle physics. Journal of Russian Laser Research, 19(5), 427-464.
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  Abstract: The primary aim of the present paper is to draw the attention of particle physicists to new developments in studying squeezed and correlated states of the electromagnetic field, and those working on the latest developments to new findings about multiplicity distributions and other specific effects in quantum chromodynamics. New types of nonclassical states used in quantum optics such as squeezed states, correlated states, and even and odd coherent states (Schrödinger cat states) for one-mode and multimode interactions are reviewed. Their distribution functions are analyzed according to the method first used for multiplicity distributions in high-energy particle interactions. The phenomenon of oscillations of particle distribution functions of squeezed fields is described and related to the phenomenon of oscillations of cumulant moments of some distributions for squeezed and correlated field states. Possible extension of the method to fields different from the electromagnetic field (gluons, pions, etc.) is conjectured, and some predictions of specific effects in nucleus-nucleus interactions at high energies are presented. © 1998 Plenum Publishing Corporation.
• Kozlov, V. V., & Polynkin, P. G. (1998). Resonantly enhanced Raman amplification of ultrashort pulses. Technical Digest - European Quantum Electronics Conference, 122-.
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  Abstract: The various practical aspects of frequency up- and down-conversion utilizing resonant Raman scattering of ultrashort pulses are studied. The physics behind the effect of `pulse locking' and resonant Raman amplification is also discussed. The proposed effects hold promise to yield coherent radiation in new frequency domains and improve performance of modern Raman lasers.
• Lee, H., Polynkin, P., & Scully, M. (1997). Dynamic suppression of spontaneous emission. Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series, 12, 92-93.
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  Abstract: Spontaneous emission can be modified if the atom is driven by an external coherent field. Such modification include the three-peak spectrum of resonance fluorescence from a two level atom. The spectral line elimination and cancellation of spontaneous emission is possible under conditions that the spontaneous emission from an excited atom can be trapped in the upper states without decaying. The amount of fluorescence in this case as well as the population of the upper levels can be controlled. If spontaneous emission along with atomic transition is suppressed, it is possible to create a population in version on this transition by using a very weak incoherent pumping.
• Lee, H., Polynkin, P., Scully, M. O., & Zhu, S. (1997). Quenching of spontaneous emission via quantum interference. Physical Review A - Atomic, Molecular, and Optical Physics, 55(6), 4454-4465.
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  Abstract: A four-level atom, driven by a coherent field, is considered. We show that under certain conditions complete quenching of spontaneous emission is possible. Hence the population inversion on some specific atomic transitions can be created using a very weak incoherent pumping. We investigate the physics of the effect using bare and dressed states. The proposed scheme may be useful, in principle, for generation of high-frequency and/or high power laser light.
• Dodonov, V. V., Man'ko, O., Man'ko, V., & Polynkin, P. G. (1996). Linear optical transformer of the photon distribution function. Proceedings of SPIE - The International Society for Optical Engineering, 2799, 230-238.
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  Abstract: A quantum optical device performing linear transformation of photon creation and annihilation operators is proposed. The action of such a linear transformer on three types of states: Fock state, squeezed and correlated state, and Schrodinger cat state is studied. The two-mode beam splitter is considered as a simple example of a linear transformer. It is shown that the beam splitter can transform subpoissonian Gaussian light into superpoissonian (and vice versa).
• Dodonov, V. V., Man'ko, O., Man'ko, V., & Polynkin, P. G. (1996). Optical transformer of photon statistics. Journal of Russian Laser Research, 17(5), 449-456.
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  Abstract: The possibility of a linear optical transformer of photon statistics for multimode light is suggested. The transformation coefficients are obtained explicitly in terms of multivariable Hermite polynomials. As physical examples of a linear transformer a resonator with moving walls and a lossless beam splitter are discussed as optical elements that change the photon statistics of light beams. The beam splitter is shown to produce redistribution of quadrature squeezing and correlation between two modes of light. ©1996 Plenum Publishing Corporation.
• Dodonov, V. V., Man'Ko, O., Man'Ko, V., Polynkin, P. G., & Rosa, L. (1995). Delta -kicked Landau levels. Journal of Physics A: Mathematical and General, 28(1), 197-208.
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  Abstract: We discuss the explicit analytical solution for the motion of a charged quantum particle in a homogeneous magnetic field under the influence of a series of delta -kicks of a cyclotron frequency. Transition probabilities between the Landau levels due to kicking are expressed in terms of the Jacobi polynomials whose arguments contain the reflection coefficient from a series of delta -walls.
• Dodonov, V. V., Dremin, I. M., Polynkin, P. G., & Man'ko, V. (1994). Strong oscillations of cumulants of photon distribution function in slightly squeezed states. Physics Letters A, 193(3), 209-217.
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  Abstract: The cumulants and factorial moments of photon distribution for squeezed and correlated light are calculated in terms of Chebyshev, Legendre and Laguerre polynomials. The phenomenon of strong oscillations of the ratio of the cumulant to factorial moment is found. © 1994.
• Dodonov, V. V., Man'ko, V., & Polynkin, P. G. (1994). Geometrical squeezed states of a charged particle in a time-dependent magnetic field. Physics Letters A, 188(3), 232-238.
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  Abstract: Geometrical squeezed states of a quantum charged particle moving in a homogeneous field are introduced. The difference between the time-dependent "circular" and Landau gauges is investigated. It is shown that only the Landau gauge generates squeezing of an initially coherent state. Two simple explicit time dependences of the magnetic field are considered: a step-like variation and a delta-kick. © 1994.