2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2002, 1995, 1992, 1990, 1989, 1988, 1987.

    

2019

  1. A. Dakova, D. Dakova, Z. Andreeva, V. Slavchev, L. Kovachev,

    Mutual action of self-phase modulation and cross-phase modulation on the parametric four-photon mixing. Exact analytical solutions in the form of Jacobi functions

    Optik, 194, 163024 (2019).

  2. V. Slavchev, A. Dakova, D. Dakova, K. Kovachev, L. Kovachev,

    Broad-band femtosecond pulses, λ3 diffraction and managing of electron mirrors

    Optik, Available online 29 January 2019, https://doi.org/10.1016/j.ijleo.2019.01.101.

  3. Bozhikoliev, K. Kovachev, A. Dakova, V. Slavchev, D. Dakova, L. Kovachev,

    Vortex solutions of vector nonlinear amplitude equations in optics,

    Proc. SPIE 11047, 20th International Conference and School on Quantum Electronics: Laser Physics and Applications, 110471C (29 January 2019); doi: 10.1117/12.2519026.

  4. Z. Andreeva, S. Milenkova, A. Dakova, D. Dakova, V. Slavchev, L. Kovachev,

    Parametric four-photon mixing: exact analytical solutions in Jacobi functions,

    Proc. SPIE 11047, 20th International Conference and School on Quantum Electronics: Laser Physics and Applications, 110471B (29 January 2019); doi: 10.1117/12.2518961.

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2018

  1. Daniela A. Georgieva, Todor. S. Petrov, Hitoki Yoneda, Rakish Shikne, Nikolay N. Nedyalkov, and Lubomir M. Kovachev,

    Avalanche parametric conversion and white spectrum generation from infrared femtosecond pulses in glasses,

    Optics Express, 26(13) pp17649-17661(2018).

  2. Dakova, A., Kovachev, L., Dakova, D., Georgieva, D., & Slavchev, V.,

    Degenerate four-photon parametric processes and vector solitons.

    Optik, 168, 721-727 (2018).

  3. L. Kovachev, D. Georgieva, J. C. Kieffer,

    Spectrum Management of THz Generation by Two Color Laser Pulses,

    Proc. of COFIL-2018,Geneva, pp 62-63 (2018)

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2017

  1. Georgieva, D., Kovachev, L., & Nedyalkov, N.,

    Avalanche parametric conversion in the initial moment of filamentation,

    Proceedings of SPIE - The International Society for Optical Engineering (Vol. 10226) (2017). https://doi.org/10.1117/12.2263483

  2. Dakova, D., Slavchev, V., Dakova, A., Kovachev, L., & Bozhikoliev, I.,

    Higher order solitons in non-paraxial optics,

    Proceedings of SPIE - The International Society for Optical Engineering(Vol. 10226). (2017) https://doi.org/10.1117/12.2263451

  3. Dakova, D., Dakova, A., Slavchev, V., Staykov, P., & Kovachev, L.,

    Soliton propagation in isotropic media under the influence of third order of linear dispersion and dispersion of nonlinearity,

    Proceedings of SPIE - The International Society for Optical Engineering(Vol. 10226) (2017). https://doi.org/10.1117/12.2263442

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2016

  1. Dakova, A. M., Dakova, D. Y., Kovachev, L. M., & Slavchev, V. I.,

    Comparison of Solutions of the General Nonlinear Amplitude Equation and a Modified Schr?dinger Equation,

    Journal of Russian Laser Research, 37(2), 155-163 (2016). https://doi.org/10.1007/s10946-016-9555-y

  2. D. Y. Dakova, A. M. Dakova, V. I. Slavchev, L. M. Kovachev,

    Soliton regime of propagation of optical pulses in isotropic medium under the influence of third order of linear dispersion and dispersion of nonlinearity

    Bulgarian Chemical Communications, Volume XX, Special Issue A, (2016).

  3. D. Dakova, A. Dakova, V. Slavchev, L. Kovachev,

    Solitons in non-paraxial optics,

    Journal of Optoelectronics and Advanced Materials, 18, Iss. 5-6, pp 435-439. (2016).

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2015

  1. L. M. Kovachev, D. A. Georgieva and A. M. Dakova,

    Influence of the four-photon parametric processes and cross-phase modulation on the relative motion of optical filaments

    Laser Phys. 25 105402 (7pp), doi:10.1088/1054-660X/25/10/105402 (2015).

  2. Daniela A Georgieva and Lubomir M Kovachev,

    Energy transfer between two filaments and degenerate four-photon parametric processes

    Laser Physics, 25 035402 (7pp) (2015). doi:10.1088/1054-660X/25/3/035402.

  3. A. M. Dakova, L. M. Kovachev, V. I. Slavchev, D. Y. Dakova,

    Diffraction of phase-modulated broad-band femtosecond pulses

    IJESIT, ISSN: 2319-5967, 4, Issue 6, November, pp. 20-26, (2015)

  4. D. A. Georgieva and L. M. Kovachev,

    Merging and energy exchange between optical filaments,

    AIP Conference Proceedings, 1684, 080005 (2015), DOI:http://dx.doi.org/10.1063/1.4934316

  5. A. M. Dakova, L. M. Kovachev, K. L. Kovachev, D. Y. Dakova,

    Fraunhofer type diffraction of phase-modulated broad-band femtosecond pulses,

    Journal of Physics Conference Series, 594 012023 (2015), doi:10.1088/1742-6596/594/1/012023.

  6. V. Slavchev, L. Kovachev , L. M. Ivanov,

    Optimization of the nonlinear regime of self-compression at femtosecond laser pulses in silica and añè,

    Journal of Physics: Conference Series 594, 012038 (2015), doi:10.1088/1742-6596/594/1/012038.

  7. A. Dakova; D. Dakova; L. Kovachev,

    Comparison of soliton solutions of the nonlinear Schr?dinger equation and the nonlinear amplitude equation,

    Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 94471A (8 January 2015); doi:10.1117/12.2177906.

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2014

  1. L. M. Kovachev,

    The light filament as vector solitary wave,

    AIP Conference. Proceedings 1629, 16 (2014); http://dx.doi.org/10.1063/1.4902271.

  2. D. A. Georgieva and L. M. Kovachev,

    Four-photon parametric mixing and interaction between filaments,

    AIP Conference Proceedings, 1629, 146(2014);

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2013

  1. L. M. Kovachev and D. A. Georgieva and V. N. Serkin,

    Parametric solitons in isotropic media,

    AIP Conference Proceedings. 1561, 289(2013); http://dx.doi.org/10.1063/1.4827239

  2. L. M. Kovachev and Daniela A. Georgieva,

    The long range filament stability: balance between non-paraxial diffraction and third-order nonlinearity,

    Proc. SPIE 8770, 17th International School on Quantum Electronics: Laser Physics and Applications, 87701G (15 March 2013).

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2012

  1. Lubomir M. Kovachev, Daniela A. Georgieva and Kamen L. Kovachev,

    Electromagnetic shock wave in nonlinear vacuum: exact solution,

    Optics Letters, 37, pp 4047-7051(2012).

  2. L. M. Kovachev and D. A. Georgieva ,

    A class of localized solutions of the linear and nonlinear wave equation,

    Journal of Geometry and Symmetry in Physics, 27, 67-82 (2012), ISSN 1312-5192.

  3. L. M. Kovachev and D. A. Georgieva,

    Analitical Solution of the Linear Wave Equation with Finite Energy

    AIP Conf. Proc. 1487, 264 (2012); DOI: 10.1063/1.4758967.

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2011

  1. Lubomir M. Kovachev and Kamen Kovachev,

    Linear and Nonlinear Femtosecond Optics in Isotropic Media. Ionization-free Filamentation,

    Laser system for applicationss, chapter 11, ISBN 978-953-307-429-0, (InTech, 2011).

  2. T. L. Belyaeva, V. N. Serkin, M.Aquero, C. Hernandez-Tenorio,and L. M. Kovachev,

    Hiden Features of the Soliton Adaptation Law to External Potentials: Optical and Matter-wave 3D Nonautonomous Soliton Bullets,

    Laser Physics, 21 (1), 1-6 (2011).

  3. C. Hernandez-Tenorio, T. L. Belyaeva, R. Perez-Torres, L. M. Kovachev, V. N. Serkin,

    Hidden features of soliton adaptation law to external potentials: optical and matter-wave soliton bullets in nonautonomous and nonlinear systems XVI ISQE"Laser physics and Applications,

    Proc. of SPIE, 7747-12 (2011).

  4. Perez-Torres, T. L. BelyaevaC. Hernandez-Tenorio, L. M. Kovachev, V. N. Serkin,

    Enhanced soliton spectral tunneling effect of self-compressing nonautonomous colored femtosecond solitons,

    XVI ISQE "Laser physics and Applications", Proc. of SPIE, 7747-11 (2011).

  5. T. L. Belyaeva, C. Hernandez-Tenorio, R. Perez-Torres, L. M. Kovachev, V. N. Serkin,

    Enigmas of optical and matter-wave nonlinear soliton tunneling effects,

    XVI ISQE "Laser physics and Applications", Proc. of SPIE, 7747-09 (2011).

  6. L. M. Kovachev and K. L. Kovachev,

    Ionization-Free Filamentation in Gases,

    Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 775128 (2011); doi: 10.1117/12.879211.

  7. T. L. Belyaeva; Akira Hasegawa; L. M. Kovachev; V. N. Serkin,

    3D soliton-like bullets in nonlinear optics and Bose-Einstein condensates,

    Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 774714 (18 January 2011); doi: 10.1117/12.881901.

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2010

  1. Kamen L. Kovachev , Luben M. Ivanov , Vladimir N. Serkin, and Lubomir M. Kovachev,

    Propagation of laser pulses in media with non-stationary optical and magnetic response,

    Journal of Appl. Electr., 12 (2) 30-36 (2010).

  2. Luben Mihov Ivanov, Vladimir N.Serkin Lubomir M. Kovachev and Mihail L. Ivanov,

    Determination of fiber's parameters by non-linear optical method,

    Journal of Appl. Electr., 12(2), 36-43 (2010).

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2009

  1. L. M. Kovachev,

    New mechanism for THz oscillation of the nonlinear refractive index in air: particle-like solutions

    Journal of Modern Optics, 56, 16, 1797-1803 (2009); DOI:10.1080/09500340903329767.

  2. Lubomir M. Kovachev, Kamen L. Kovachev and Ivaylo Tunchev,

    Femtosecond pulses in air: linear and nonlinear regime,

    International Conference Ultrafast and Nonlinear Optics, UFNO'09, 14-18 September, Bourgas, 2009, Proc. SPIE, 7501, 75010E (2009), doi:10.1117/12.849380.

  3. L. M. Kovachev,

    Group-phase velocity difference and THz oscillation of the nonlinear refractive index: particle-like solutions,

    1st International Conference on Applications of Mathematics in Technical and Natural Sciences, AIP Proceedings, 1186, pp. 69-81(2009); ISBN: 978-0-7354-0752-7.

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2008

  1. Lubomir M. Kovachev, Kamen L. Kovachev,

    Diffraction of femtosecond pulses: nonparaxial regime,

    Journal of Opt. Soc. Am. A, 25, 9, pp.2232-2243 (2008).

  2. Kovachev, Lubomir M; Kovachev, Kamen L,

    Diffraction of femtosecond pulses. Nonparaxial regime: erratum,

    JOSA A, 25 Issue 12, pp.3097-3098 (2008).

  3. Lubomir M. Kovachev,

    Beyond the spatio-temporal model in femtosecond optics,

    Journal of Modern Optics, 55, 17, pp. 2975-2891 (2008).

  4. T. L. Belyaeva, V. N. Serkin, C. Hernandez-Tenorio and L. M. Kovachev,

    Soliton dynamics in confining time-dependent potentials

    Proc. SPIE 7027, 15th International School on Quantum Electronics: Laser Physics and Applications, 70271I (19 December 2008); doi:10.1117/12.822531, ISBN 9780819472410.

  5. H. Hasegawa, L. I. Pavlov, Y. Ohshima, L. M. Kovachev, I. Tunchev,

    Observed reduced diffraction of focused femtosecond pulses,

    Proc of SPIE, 15'th International School on QE, Laser Physics and Applications, 18-22 September, Burgas, (2008); ISBN 9780819472410.

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2007

  1. L. M. Kovachev,

    Collapse arrest and wave-guiding of femtosecond pulses,

    Optics Express, 15, 16, pp. 10318-10323 (August 2007).

  2. Serkin, L. M. Kovachev, T. L. Belyaeva,

    Exactly integrable models for optical solitons amplification: analytical and computational studies,

    Proc. SPIE 6604, 14th International School on Quantum Electronics: Laser Physics and Applications, 66041V (5 March 2007); doi:10.1117/12.727193.

  3. L. M. Kovachev,

    Nonparaxial evolution of femtosecond optical pulses,

    Int. Congress on Optics and Optoelectronics, Prague 2007, Proc. SPIE 6582, Nonlinear Optics and Applications II, 658208 (8 May 2007); doi:10.1117/12.722767.

  4. L. M. Kovachev, Ivaylo Tunchev,

    Dynamics of femtosecond laser pulses in air and in vacuum,

    14th Int. School on Quantum Electronics: Laser Physics and Applications, Sunny Beach, Bulgaria, Proc of SPIE, 66041G (5 March 2007); doi:10.1117/12.726987 (2007).

  5. L. M. Kovachev, Luben Ivanov and Ivaylo Tunchev,

    Ultra-short optical pulses in media with non-stationary optical and magnetic response,

    14th Int. School on Quantum Electronics: Laser Physics and Applications, Sunny Beach, Bulgaria, Proc of SPIE 66041H (2007) doi:10.1117/12.726988.

  6. L. I. Pavlov; L. M. Kovachev; D. Y. Dakova; S. V. Naboko; D. V. Stoimenova; R. L. Pavlov; S. I. Pavlova; I. Y. Tabanliyski; S. P. Penchev,

    Effect of parametric processes on the stimulated Raman scattering in fibers,

    Proc. SPIE 6604, 14th International School on Quantum Electronics: Laser Physics and Applications, 66041R (5 March 2007); doi: 10.1117/12.727170.

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2006

  1. L. M. Kovachev, L.I.Pavlov, L.M.Ivanov, D.Y.Dakova,

    Optical filaments and optical bullets in dispersive, nonlinear media,

    Journal of Russian Laser Research, 27, 3, 185-203 (2006).

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2005

  1. L. M. Kovachev, L.M.Ivanov,

    Vortex solitons in dispersive nonlinear Kerr type Media,

    Proceedings of SPIE, Nonlinear Optics Applications, Proc. SPIE 5949, Nonlinear Optics Applications, 594907 (5 October 2005); doi: 10.1117/12.621852.

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2004

  1. L. M. Kovachev,

    Vortex solutions of the Nonlinear Optical Maxwell-Dirac Equations,

    Physica D-Nonlinear Phenomena, 190, pp. 78-92 ( 2004).

  2. L. M. Kovachev,

    Optical vortices in dispersive nonlinear Kerr type media,

    International Journal of Mathematics and Mathematical Sciences, 18, pp. 949-967 (2004).

  3. L. M. Kovachev,

    Optical leptons,

    International Journal of Mathematics and Mathematical Sciences, 24, pp.1403-1422 (2004).

  4. L. M. Kovachev, N.I.Kaymakanova, D.Y. Dakova, L.I.Pavlov, R.A.Rousev, S.G.Donev, R.L.Pavlov,

    Three-Dimensional Solutions in media with spatial dependence of nonlinear refractive index,

    Journal of Physical Studies, 8, pp.1-4, (2004).

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2002

  1. D.R.Andersen , L.M.Kovachev,

    Interaction of coupled optical vortices,

    Journal of Optical Society of America B, 19, 3, pp. 376-384 (2002).

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1995

  1. L. I. Pavlov, L. M. Kovachev,

    Four photon parametric processes by optical pulses with noise structure,

    Applied Physics B, 60, pp. 571-572 (1995).

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1992

  1. L. M. Kovachev,

    Influence of cross-phase modulation and four-photon parametric mixing on the relative motion of optical pulses,

    Optical and Quantum Electronics, 24, pp. 55-66 (1992).

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1990

  1. V.V.Afanas'ev, L. M. Kovachev and V.N. Serkin,

    Interaction of pulses on different Frequencies,

    Letters in JTP, 16,14, pp. 10-14, (1990).

  2. L. M. Kovachev and I. M.Uzunov,

    Influence of the exchange of energy between optical pulses on their relative movement through parametric processes in single mode optical fibres,

    Journal of Modern Optics, 37, 9, pp. 1453-1458, (1990).

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1989

  1. L. M. Kovachev,

    Parametric solitons and Raman resonance and self-induced transparency in silica optical fiber,

    Optical and Quantum Electronics, 21, pp. 429-433 (1989).

  2. L. M. Kovachev, V.N.Serkin,

    Stimulated four-photon nonlinear processes and parametric solitons in optical fibers,

    Quantum Electronics,16, 9, pp.1881-1884 (1989).

  3. I.M.Uzunov, V.M.Mitev and L. M. Kovachev,

    Propagation of one soliton pulses successions in monomode optical fibers,

    Optics Communications, 20, 5, pp. 389-392 (1989).

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1988

  1. L. M. Kovachev, V.N.Serkin,

    Optical solitons and compression of pulses by four- photon parametric processes in optical fiber,

    Letters in GTP, 14,10, pp. 880-884, (1988).

  2. L. M. Kovachev , V.N Serkin,

    Compresion of pulses by four-pfoton parametric processes and parametric solitons,

    Izv. Akad. Nauk SSSR, Phys, 53, pp.1599-1605, 1988.

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1987

  1. V.M.Mitev, L. M. Kovachev,

    Soliton shaping by stimulated Raman process in silica optical fibers

    Optics communications, 65, pp. 421-424 (1987).

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