Prof. Dr. Sergey Kobtsev
Division of Laser Physics and Innovative Technologies, Novosibirsk State University, Novosibirsk 630090, Russia
Head of Division of laser physics and innovative technologie...
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Academic Career Length
39Years (1988-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications30 November 2020 in Nature Photonics
Journal Article
GGGoëry Genty
Goëry GentyLSLauri Salmela
Lauri SalmelaJDJohn M. Dudley
John M. DudleyDBDaniel Brunner
Daniel BrunnerAKAlexey Kokhanovskiy
Alexey Kokhanovskiy
Sergei Turitsyn +1
27 October 2009 in Optics Express
Journal Article
Sergey KobtsevSKSergey Kukarin
Sergey Kukarin
SSSergey Smirnov
Sergey SmirnovSergei TuritsynALAnton Latkin
Anton Latkin
We observed generation of stable picoseconds pulse train and double-scale optical lumps with picosecond envelope and femtosecond noise-like oscillations in the same Yb-doped fiber laser with all-positive-dispersion cavity mode-locked due to the effect of non-linear polarization evolution. In the noise-like pulse generation regime the auto-correlation function has a non-usual double (femto- and picosecond) scale shape. We discuss mechanisms of laser switching between two operation regimes and demonstrate a good qualitative agreement between experimental results and numerical modeling based on modified nonlinear Schrödinger equations.
17 December 2008 in Optics Express
Journal Article
This paper reports on the results of research into passively mode-locked fiber laser with a record-setting optical length of the resonant cavity amounting to 3.8 km. Significant elongation of the laser resonator led to more than two orders of magnitude increase in the output pulse energy at the same pump radiation power. At ultra-low (for mode-locked lasers) pulse repetition rate (77 kHz) and pulse duration of 3 ns the energy per pulse reached 3.9 µJ. At this moment this is the highest pulse energy on record generated directly from a mode-locked laser without Q-switching, cavity dumping techniques, or additional optical amplifiers.
19 November 2012 in Optics Express
Journal Article
SSSergey Smirnov
Sergey SmirnovSergey KobtsevSKSergey Kukarin
Sergey Kukarin
AIAleksey Ivanenko
Aleksey Ivanenko
We show experimentally and numerically new transient lasing regime between stable single-pulse generation and noise-like generation. We characterize qualitatively all three regimes of single pulse generation per round-trip of all-normal-dispersion fiber lasers mode-locked due to effect of nonlinear polarization evolution. We study spectral and temporal features of pulses produced in all three regimes as well as compressibility of such pulses. Simple criteria are proposed to identify lasing regime in experiment.
7 May 2015 in Nature Communications
Journal Article
DCDmitry Churkin
Dmitry ChurkinSSS. Sugavanam
S. Sugavanam
NTN. Tarasov
N. TarasovSKS. Khorev
S. Khorev
SSS. V. Smirnov
S. V. SmirnovSergei Turitsyn +1
Physical systems with co-existence and interplay of processes featuring distinct spatio-temporal scales are found in various research areas ranging from studies of brain activity to astrophysics. The complexity of such systems makes their theoretical and experimental analysis technically and conceptually challenging. Here, we discovered that while radiation of partially mode-locked fibre lasers is stochastic and intermittent on a short time scale, it exhibits non-trivial periodicity and long-scale correlations over slow evolution from one round-trip to another. A new technique for evolution mapping of intensity autocorrelation function has enabled us to reveal a variety of localized spatio-temporal structures and to experimentally study their symbiotic co-existence with stochastic radiation. Real-time characterization of dynamical spatio-temporal regimes of laser operation is set to bring new insights into rich underlying nonlinear physics of practical active- and passive-cavity photonic systems.
1 September 2005 in Optical Fiber Technology
Journal Article
SSS.V. Smirnov
S.V. SmirnovJCJuan Diego Ania Castañon
Juan Diego Ania CastañonTET.J. Ellingham
T.J. Ellingham
Sergey KobtsevSKS. Kukarin
S. Kukarin
Sergei TuritsynAbout Me
Prof. Dr. Sergey Kobtsev is an associate professor at the Division of Laser Physics and Innovative Technologies, Novosibirsk State University. He obtained his Philosophy Doctor degree in Physics and Mathematics at the Institute of Automation and Electrometry, Siberian Branch of Russian Sciences Academy, in 1992. He served as the Head of the Laser Systems Laboratory, Novosibirsk State University, from 1998 to 2011, as a Research Fellow from 1986 to 1991, and a Director of the Interdisciplinary Quantum Centre, Physics Faculty, Novosibirsk State University, from 2015 to 2021. He has been working as a CEO & Founder of TEKHNOSCAN Group since 1993 and a Head of the Division of Laser Physics and Innovative Technologies, Novosibirsk State University, since 2021. He is a member of the Optical Society (OSA), The International Society For Optical Engineering (SPIE), the Russian Laser Association, and the D. S. Rozhdestvensky Optical Society. He was awarded the Honored Scientist of Novosibirsk region in 2017.