Konstantin Komarov
Russian Academy of Sciences
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Publication
Featured researches published by Konstantin Komarov.
Journal of Optics | 2007
Andrey Komarov; Konstantin Komarov; Hervé Leblond; François Sanchez
We study properties of dissipative solitons in passive mode-locked fibre lasers due to additional intracavity narrow spectral selection. Such selection allows us to control the soliton velocity, the nature of the interaction between solitons (attraction or repulsion), to create a bistable state in which the velocity of a single soliton can have two different values, to realize an elastic particle-like collision between single solitons. In the investigated laser system, the soliton interaction distance can be considerably larger than the soliton duration, which allows the realization of passive harmonic mode-locking.
International Journal of Optics | 2012
Andrey Komarov; Foued Amrani; Alexander Dmitriev; Konstantin Komarov; Dmitry Meshcheriakov; François Sanchez
We present results of our research on a multiple-pulse operation of passive mode-locked fiber lasers. The research has been performed on basis of numerical simulation. Multihysteresis dependence of both an intracavity energy and peak intensities of intracavity ultrashort pulses on pump power is found. It is shown that the change of a number of ultrashort pulses in a laser cavity can be realized by hard as well as soft regimes of an excitation and an annihilation of new solitons. Bound steady states of interacting solitons are studied for various mechanisms of nonlinear losses shaping ultrashort pulses. Possibility of coding of information on basis of soliton trains with various bonds between neighboring pulses is discussed. The role of dispersive wave emitted by solitons because of lumped intracavity elements in a formation of powerful soliton wings is analyzed. It is found that such powerful wings result in large bounding energies of interacting solitons in steady states. Various problems of a soliton interaction in passive mode-locked fiber lasers are discussed.
international conference on transparent optical networks | 2007
A. K. Komarov; Konstantin Komarov; Hervé Leblond; François Sanchez
On basis of numerical simulation it is found that the interaction of ultrashort pulses in fibre laser can be attractive or repulsive depending on parameters of additional intracavity narrowband spectral selector. The operation regimes realizing in such lasers are investigated.
Optics and Spectroscopy | 2007
Andrey Komarov; Konstantin Komarov; Hervé Leblond; François Sanchez
The interaction of light pulses in passively mode-locked fiber lasers operating has been studied. The numerical simulation has been used to demonstrate that a narrow-band selector inserted in a laser cavity allows the character of the interaction to be changed: depending on the detuning of the selector passband from the center of the gain band, ultrashort pulses can both attract and repel one another. Peculiarities of the pulse interaction have been studied at different parameters of the laser system.
Nonlinear Optics and its Applications 2018 | 2018
François Sanchez; Georges Semaan; Fatma Ben Braham; Mohamed Salhi; Meriem Kemel; Alioune Niang; Yichang Meng; Andrey Komarov; Konstantin Komarov
Dissipative soliton resonance (DSR) is an efficient way to achieve high energetic pulses without wave breaking. In fiber laser, DSR operation manifests as square pulses emission. Based on this principle, we have experimentally demonstrated pulses in the micro joule range. Experiments have been conducted using double-clad Er:Yb-doped fiber lasers in different optical configurations. In particular, we demonstrate 10 μJ DSR emission in an optimized cavity and also the possibility to observe wave breaking in DSR regime. In the latter case, harmonic mode-locking of square pulses is demonstrated.
Optics and Spectroscopy | 2016
Andrey Komarov; Alexander Dmitriev; Konstantin Komarov; François Sanchez
Computer simulation is used to investigate a new regime of oscillation of fiber lasers in which passive mode-locking takes place simultaneously with the regime of regular undumped spiking induced by an intracavity saturable absorber. Such a superposition regime takes place when part of the output radiation of the laser operating in the regime of spiking is propagated through a fiber-optic delay line and is coupled back into the laser cavity in a time interval equal to the time interval between adjacent spikes. The advantages of the proposed regime of oscillation relative to other means of achieving passive mode-locking in fiber lasers are discussed. The proposed regime is of interest for obtaining reproducible high-energy light pulses.
Advanced Photonics (2014), paper NM2A.2 | 2014
Alioune Niang; Foued Amrani; Mohamed Salhi; Hervé Leblond; Andrey Komarov; Konstantin Komarov; François Sanchez
We have studied the influence of an external continuous wave on a passively mode-locked fiber laser operating in the soliton regime. Starting from an irregular soliton distribution it is shown that harmonic mode-locking is obtained.
international conference on transparent optical networks | 2008
A. K. Komarov; Konstantin Komarov; Hervé Leblond; François Sanchez
We have determined the conditions for realization of bell-shaped and rectangle spectra of laser solitons in model described by the complex cubic Ginzburg-Landau equation. Spectral peculiarities due to additional quadratic and quintic nonlinearities have been found too.
2008 2nd ICTON Mediterranean Winter | 2008
Andrey Komarov; Konstantin Komarov; Adil Haboucha; François Sanchez
On basis of numerical simulations we have forward a way to realize high-stable noise-proof information sequences of ultrashort pulses, whose unique properties are caused by properties of the bound structural solitons. Coding of the information in such sequences is carried out through a distribution along the soliton train of various types of bonds between neighboring solitons. For pair bound solitons we have found possible types of the bound states, each of which is determined by its quantized energy level, its distances between the solitons in the stationary bound state, its distribution of radiation in such two soliton molecule. One of such types of bound states is realized in each pair of neighboring solitons in multisoliton train.
2008 2nd ICTON Mediterranean Winter | 2008
A. K. Komarov; Konstantin Komarov; Adil Haboucha; François Sanchez
On basis of numerical simulation we have studied the characteristic generation instability arising from inertial modulation of gain-losses and refractive index of an intracavity laser medium. Such modulation is used as a method for management of interaction of ultrashort pulses in the laser resonator. The modulation due to an electro-optical feedback loop is considered also. In the case of such modulation the analyzed instability can be suppressed.