Kovrov State Technological Academy

Vladimir region, Russia

Kovrov State Technological Academy

Vladimir region, Russia

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Pogoda A.P.,Saint Petersburg State University | Lebedev V.F.,Saint Petersburg State University | Makarchuk P.S.,Saint Petersburg State University | Smetanin S.N.,Kovrov State Technological Academy | Boreysho A.S.,Saint Petersburg State University
Optical Memory and Neural Networks (Information Optics) | Year: 2013

Several configurations of the laser self-pumped phase-conjugate cavities with multiwave mixing directly in the laser medium based on a single Nd:YAG laser element pumped by multikilowatt laser diode 2D stacks are experimentally studied and compared. In the laser configurations with six- and eight-wave mixing there are generated a high-intensive self-Q-switched 200-ns laser pulse followed by low-intensive free-running lasing. An increase of the number of waves taking part in multiwave mixing from six to eight leads to increase in the laser maximum output energy and optical-to-optical efficiency from 0.55 up to 1.1 J and from 8.3 up to 18% respectively. In the laser configuration with ten-wave mixing the energy characteristic is similar to the same in the laser configuration with eight-wave mixing, but the temporal and spectral characteristics are different from the same in the laser configurations with six- and eight-wave mixing. In last laser configuration not only the first pulse, but also all the train of pulses is generated in high-intensive TEM00 diffraction-limited (M 2 = 1.3-1.5) single-frequency self-Q-switched mode via writing and erasing the gain gratings by the intracavity radiation. © 2013 Allerton Press, Inc.


Lebedev V.F.,Saint Petersburg State University | Pogoda A.P.,Saint Petersburg State University | Smetanin S.N.,Kovrov State Technological Academy | Boreisho A.S.,Saint Petersburg State University | Fedin A.V.,Kovrov State Technological Academy
Technical Physics | Year: 2014

The generation regimes in a pulsed Nd:YAG laser with transverse LED pumping and multiloop self-pumped phase-conjugate cavity on the gain gratings are studied. The differential efficiency of laser is 27% in the free-running regime at a pulse energy of up to 1 J and quality parameter M2 of no greater than 1.5. The pulse energy under passive Q-switching is no less than 60% of the pulse energy in the free-running regime at the same beam quality. The generation of the narrow-band radiation is demonstrated. A generation band of no greater than 1.2 GHz corresponds to the primary single-frequency high-power laser pulse in the free-running mode under conditions for self-Q-switching on the gain gratings. When additional elements (F2 −:LiF and Cr4+:YAG crystals) are introduced in the optical scheme of the phase-conjugate cavity, similar narrowband single-mode generation is observed in the passive Q-switching regime as a pulse train or monopulse. The laser pulse power is up to 2 MW at a pulse duration of 20 ns. © 2014, Pleiades Publishing, Ltd.


Pogoda A.P.,Saint Petersburg State University | Lebedeva T.B.,Saint Petersburg State University | Yusupov M.R.,Saint Petersburg State University | Liventsov R.A.,Saint Petersburg State University | And 5 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

The joule-range high-beam-quality Nd 3+:YAG laser oscillation in the multiloop self-pumped phase-conjugate cavity without an output coupling mirror at four-wave mixing of intracavity beams directly in the 110-mm long Nd 3+:YAG rod with 12.6 kW diode side-pumping is developed and studied. The oscillation efficiency of up to 18% and average power of up to 22 W were achieved in the optimized geometry of the laser cavity at the 13.9 kW pumping with repetition rate of up to 20 Hz and pulse duration of up to 475 μs. The laser generated a single high-intensive 200-ns giant laser pulse (or series of such pulses with microsecond period at increased pumping) oscillated at self-Q-switch on gain gratings with relatively narrow linewidth of about 2 GHz followed by low-intensive free-running wideband lasing. We also realized a passive Q-switch by the F 2 -:LiF and Cr 4+:YAG crystals with oscillation of pulse trains and also 30-ns single-pulse oscillation with an individual pulse energy of up to 60 mJ and peak power of up to 4 MW at narrowed laser spectra down to 1.7 GHz. © 2013 SPIE.


Lebedev V.F.,Saint Petersburg State University | Pogoda A.P.,Saint Petersburg State University | Boreysho A.S.,Saint Petersburg State University | Smetanin S.N.,Kovrov State Technological Academy | Fedin A.V.,Kovrov State Technological Academy
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

A high-energy, high-beam-quality laser based on a single Nd:YAG rod with laser diode side-pumping and multiloop self-adaptive reciprocal cavity is presented. The optimized laser cavity geometry allowed to change the laser oscillation from single 200-ns self-Q-switched pulse followed by low-intensity free-running lasing to repetitive high-intensive pulses by periodically writing and erasing holographic gain gratings in the active Nd:YAG medium. The intensified self-Q-switching pulse train oscillation was realized by the interaction with a diffusely reflecting target placed in the focal plane of a lens at the laser output. Effects of shortening of the repetitive laser pulses down to 70-ns duration, stabilization of the pulse repetition period (∼ 5 μs), and mode-locking temporal modulation of the pulses were observed. The use of a passive F2-:LiF Q-switch resulted in stable giant pulse train oscillation with total output energy of up to 0.43 J, individual pulse energy of 50 mJ, and its peak power of 4 MW at the individual pulse duration of 12 ns. © 2015 SPIE.


Barabanova L.P.,Kovrov State Technological Academy
Acoustical Physics | Year: 2015

The paper discusses a new algorithm for passive (no-request) navigation in a water layer within the framework of ray theory in a flat-layered medium, when the dependence of the sound velocity on depth in the water layer is known. This algorithm is a combination of the Descartes method for the initial approximation and the subsequent Newton iteration method in the case of four synchronous beacons or the Gauss–Newton iteration method in the case of more than four synchronous beacons. Three Cartesian coordinates of an underwater object and the moment of synchronous emission of an acoustic signal by the beacons are found. Operation of the appropriate program is demonstrated for data close to actual. Computer simulation predicts an improvement in accuracy by tens of meters. © 2015, Pleiades Publishing, Ltd.


Basiev T.T.,RAS A.M. Prokhorov General Physics Institute | Gavrilov A.V.,Kovrov State Technological Academy | Smetanin S.N.,Kovrov State Technological Academy | Fedin A.V.,Kovrov State Technological Academy
Doklady Physics | Year: 2010

A study was conducted to propose the use of a passive Q-switch (PQS) for the phase locking control of a multichannel holographic laser system with short-range coupling. The passive Q-switch was mounted near the intersection of laser beams of one of the laser channels or a pair of laser channels. The reason was that the passive Q-switch (PQS) of loop laser resonators was performed only in such cases. Steady-state radiation exchange is implied on reference mirror RM through coaxial summation of emission of each laser channel using beam-splitting mirrors. The potential of using the PQS in one of laser channels for synchronous startup of the entire multichannel laser system was caused by a distinction in the principle of the PQS with dynamic PC mirrors from the conventional laser resonator with stationary mirrors.


Smetanin S.N.,RAS A.M. Prokhorov General Physics Institute | Jelinek M.,Czech Technical University | Kubecek V.,Czech Technical University | Jelinkova H.,Czech Technical University | And 2 more authors.
Laser Physics Letters | Year: 2016

The 280 picosecond 2nd Stokes Raman pulses at 1.3 μm were generated directly from the miniature diode-pumped Nd:SrMoO4 self-Raman laser. Using the 90° phase matching insensitive to the angular mismatch, the self-Raman laser allowed for the achievement of the four-wave-mixing generation of the 2nd Stokes Raman pulse directly in the active Nd:SrMoO4 crystal at stimulated Raman scattering (SRS) self-conversion of the laser radiation. The passive Cr:YAG Q-switching and nonlinear cavity dumping was used without any phase locking device. © 2016 Astro Ltd.


Khrustalev P.,Kovrov State Technological Academy
2012 4th International Conference "Problems of Cybernetics and Informatics", PCI 2012 - Proceedings | Year: 2012

In this article the technique of process optimization of pointing of the onboard weapon of a robotics complex with use of intellectual means of optical-electronic station is described. © 2012 IEEE.


Khrustalev P.,Kovrov State Technological Academy
2012 4th International Conference "Problems of Cybernetics and Informatics", PCI 2012 - Proceedings | Year: 2012

In article definition of self-configured optical-electronic station of a robotics complex is given, process of a self-configuration and the results received in case of such method of functioning of optical-electronic station is described. © 2012 IEEE.


Barabanova L.P.,Kovrov State Technological Academy
Journal of Computer and Systems Sciences International | Year: 2015

A new method for positioning a signal receiver of the global navigation satellite system is proposed within the ray theory and under the assumption that the atmosphere is spherically stratified and the dependence of the speed of the radio signal sent by each navigation satellite on the distance from the center of the Earth is known. A new basic system of equations is presented. For the minimum number of four navigation satellites, it consists of eight equations in eight unknowns, four of which are accessory ray parameters. The correctness of the new basic system is proved, and an algorithm for its solution is described. The purpose of the new method is a significant improvement in the accuracy of the absolute positioning of the signal receiver of the global navigation satellite system through the proper account of irregularities of the ionosphere and troposphere. © 2015, Pleiades Publishing, Ltd.

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