I. N. Konovalov

Institute of High Current Electronics, Tomsk, Tomsk, Russia

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Publications (51)11.74 Total impact

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    ABSTRACT: The parameters of electric-discharge pulse-periodic XeCl lasers with a pulse duration of 25 - 40 ns, an energy of 0.2 - 0.7 J, and a pulse repetition rate up to 100 Hz have been investigated. It is shown that the total laser efficiency of 2.6 % and the maximum efficiency with respect to the stored energy of 3.8 % are obtained at a specific pump power of 2.8 - 3.3 MW cm-3 and a discharge circuit inductance of 3.5 - 4 nH.
    Quantum Electronics 08/2011; 41(8):687. DOI:10.1070/QE2011v041n08ABEH014411 · 0.89 Impact Factor
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    ABSTRACT: Development of KrF laser system for lidar designed for detection of the compound molecules containing a nitric oxide is presented. The system consists of the master oscillator and the amplifier operating at pulse repetition rate up to 100 Hz. Laser radiation having energy up to 0.2 J and bandwidth of 2 pm is smoothly tuned in a spectral range of 247.6-249.5 nm.
    Proceedings of SPIE - The International Society for Optical Engineering 09/2010; DOI:10.1117/12.879644 · 0.20 Impact Factor
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    ABSTRACT: The advantages of inductive energy storage (IES) generators for increasing the pulse energy, power, and duration for nitrogen laser pumped by self-sustained transverse discharge have been experimentally demonstrated. A theoretical model is developed and the operation of IES-pumped laser on nitrogen-electronegative gas mixtures is numerically simulated. It is shown experimentally and theoretically that, adding electronegative gases, one can control the pulse shape of lasing on the C3II u -B3II g transition in nitrogen. The increase in the electric field strength in the laser gap in N2-NF3 and N2-SF6 mixtures produced 337.1-nm laser pulses consisting of two spaced peaks and 40–50-ns pulses close to rectangular. The increase in the laser active volume to 6 l (discharge cross section to 6×10 cm2) in N2–SF6 mixtures made it possible to obtain the maximum output energy (Q=110 mJ) and UV power (P las =6 MW). In N2-NF3 mixtures, the laser pulse duration was up to ∼100 ns with an energy up to Q=30 mJ.
    Physics of Wave Phenomena 12/2009; 17(4):251-276. DOI:10.3103/S1541308X09040037 · 0.30 Impact Factor
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    ABSTRACT: The parameters of a wide-aperture nitrogen laser pumped by a generator with the inductive energy storage and a SOS diode opening switch or a generator with the capacitive energy storage are studied. The gas preionisation was performed by soft X-rays. The size of the active volume of the laser was 10×6×100 cm. The output energy and power obtained at the 337.1-nm C 3Πu — B 3Πg transition are maximal for electric-discharge nitrogen lasers. The output energy in the second positive system of nitrogen in the N2—SF6 mixture achieved 110 mJ for a peak power of 6 MW. Due to an increase in voltage across the laser gap in nitrogen mixtures with NF3, the generation of ~35-mJ, 100-ns pulses was obtained in the quasi-stationary stage of the discharge.
    Quantum Electronics 10/2007; 37(7):623. DOI:10.1070/QE2007v037n07ABEH013504 · 0.89 Impact Factor
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    ABSTRACT: An excimer laser system having an output aperture diameter of 40 cm and consisting of five lasers, three of which are excited by an electric discharge and the remaining two by an electron beam, is built. The first laser produces a 308-nm radiation with a duration of 200—250 ns, a spectral linewidth of 0.9 cm-1 and the beam divergence close to the diffraction limit. This pulse is amplified in the active media of the other lasers. As a result, radiation with an energy of 5 J, spectral linewidth 0.9 cm-1 and beam divergence 37 μrad is produced at the output of the third laser. The output energy of the entire system amounts to 330 J and the pulse duration is 200—250 ns.
    Quantum Electronics 10/2007; 36(1):33. DOI:10.1070/QE2006v036n01ABEH012795 · 0.89 Impact Factor
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    ABSTRACT: The development of a long-pulse electric-discharge XeCl laser with the 9 × 6 × 100 cm active volume is reported. Laser is excited by using a double circuit with a pulsed charged storage capacitor consisting of paper-oil capacitors forming the pulse-shaping line. The storage capacitor is switched by a multichannel extended gap. The laser mixture was preionised by X-rays. The laser generated the 10-J output pulses with the FWHM of 300 ns, and a uniform intensity distribution over the exit aperture.
    Quantum Electronics 10/2007; 35(3):237. DOI:10.1070/QE2005v035n03ABEH003428 · 0.89 Impact Factor
  • I N Konovalov, N N Koval, A I Suslov
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    ABSTRACT: The results of investigation of an electric discharge XeCl laser with active region apertures 8 × 11, 10 × 15, and 15 × 15 cm are presented. The preionisation of the Ne — Xe — HCl working mixture was performed by soft X-rays and a low-current electron beam, which provided the initial concentration n0 of electrons in the gas from 106 to 2 × 1013 cm-3. For n0 < 1012 cm-3, the homogeneity of the initial electron concentration and of an electric field in the discharge gap have a considerable effect on the homogeneity of the volume discharge and output characteristics of the laser. For n0 ≥ 1012 cm-3, a homogeneous volume discharge is ignited and is stable if the inhomogeneity of the electric field in the discharge gap does not exceed 10%. A storage capacitor charged to double the voltage of the quasi-stationary discharge operation is sufficient for discharge formation. It is shown that an improvement of the volume discharge homogeneity and a decrease in the size of the discharge chamber make it possible to increase the efficiency of a wide-aperture XeCl laser.
    Quantum Electronics 10/2007; 32(8):663. DOI:10.1070/QE2002v032n08ABEH002267 · 0.89 Impact Factor
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    ABSTRACT: An investigation was made of an electric-discharge XeCl laser with the active region of 4 cm × 5.5 cm × 100 cm dimensions. The laser was pumped by one of two pulse generators: a generator with a two-circuit configuration, a peaking capacitor, and a spark switch or a thyratron magnetic generator. An Ne(He, Ar)—Xe—HCl working mixture was preionised by x rays of 25–30 keV energy. A study was made of the conditions needed for the initiation of a homogeneous volume discharge. When the buffer gas in the mixture was neon, the radiation energy per pulse was 5 J, in a mixture with helium it was 2.5 J, and in a mixture with argon it was 1.2 J.
    Quantum Electronics 10/2007; 25(6):525. DOI:10.1070/QE1995v025n06ABEH000404 · 0.89 Impact Factor
  • V A Basov, I N Konovalov
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    ABSTRACT: An investigation was made of an electric-discharge XeCl laser with an active region of 5.5 cm × 7 cm × 100 cm dimensions. This laser was pumped by a voltage generator based on capacitance storage lines. A multichannel spark-discharge gap was used as a fast-response switch. An Ne—Xe—HCl working mixture was preionised with soft x-rays. When the charging voltage applied to the capacitance lines was constant, an output radiation energy of 10.5 J and an efficiency of 3% (in terms of the stored energy) were achieved. When the capacitance lines were subjected to pulsed charging, the energy per pulse was 14 J and the efficiency was 4%.
    Quantum Electronics 10/2007; 26(9):767. DOI:10.1070/QE1996v026n09ABEH000776 · 0.89 Impact Factor
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    I N Konovalov, Yu N Panchenko, M Yu Sukhov
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    ABSTRACT: A pulse generator is developed for pumping electric-discharge excimer lasers in which the capacitive energy storage is connected with the gas-discharge chamber of the laser with the help of a multichannel spark switch via a low-inductive strip line. This scheme of the generator reduces energy losses in the switch and the inductance of the discharge circuit of the capacitive storage. For the pump power equal to 800 MW, the efficiency of the stored energy transfer to a load achieves 85%. To ignite a homogeneous volume discharge, the generator produces a prepulse, which initiates a low-current volume discharge in the gas-discharge chamber. Upon excitation of an electric-discharge XeCl laser with the 3 × 5.4 × 80-cm active region and the Ne : Xe : HCl= 2000 : 2.5 : 1 mixture at a pressure of 4 atm, radiation pulses with energies up to 3.4 J and the FWHM duration up to 260 ns were obtained with a homogeneous energy distribution over the laser aperture.
    Quantum Electronics 10/2007; 34(3):289. DOI:10.1070/QE2004v034n03ABEH002629 · 0.89 Impact Factor
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    ABSTRACT: The results of experimental research on an x-ray source intended for preionizing the laser mixture in wide-aperture electric-discharge excimer lasers are presented. An experimental prototype of the source in which an x-ray radiation pulse is formed in an inverted-type vacuum diode during braking of accelerated electrons in a tantalum foil has been developed. It is shown that the use of a metal-dielectric cathode allows generation of x rays with nonuniformity of the intensity distribution within limits of 10% at an energy of quanta no higher than 55 keV and a radiation exposure dose 160 mR.
    Instruments and Experimental Techniques 01/2007; 50(1):95-99. DOI:10.1134/S0020441207010137 · 0.35 Impact Factor
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    ABSTRACT: We report development of long-pulse discharge N2-lasers pumped by inductive energy storage with maximal radiation parameters. The laser output from an active volume with cross-section up to 6×10 cm2 was as high as 110 mJ with peak power of about 6 MW. In mixtures of nitrogen with NF3 laser pulses about 100 ns in duration were obtained. Numerical model of nitrogen laser on mixtures of nitrogen with electronegative gases pumped by transverse discharge is developed. This model allows to simulate laser parameters on transition C3Piu --> B3Pig and predict the laser operation in different experimental conditions.
    Proceedings of SPIE - The International Society for Optical Engineering 01/2007; DOI:10.1117/12.753275 · 0.20 Impact Factor
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    ABSTRACT: Two-high power excimer laser systems with square (25 × 25 cm) and circular (with a diameter of 40 cm) cross sections of the output laser beam are described. The first (second) system consists of four (five) excimer lasers. The experimental results on the generation of the high-quality high-power laser pulses are presented. Laser beams with a pulse duration of 1–250 ns, a divergence of 0.01 mrad, a spectral line width of 0.01 cm−1, and a pulse energy of up to 330 J are obtained.
    Laser Physics 12/2005; 16(1):104-115. DOI:10.1134/S1054660X06010099 · 1.03 Impact Factor
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    ABSTRACT: A four-stage XeCl laser system named Photons has been developed for studying laser interaction with materials. The Photons are outlined and preliminary results characterizing the system are given. The master oscillator Photon-1 can provide "seed" light with laser energy of about 40mJ, pulse duration of about 250ns and good beam quality of nearly diffraction-limited divergence angle and narrow line width less than 1 cm-1 for whole system. The output energy of laser system of 251J has been obtained by four-stage amplification. The synchronization among five lasers is realized by the combination of low voltage timer, high voltage synchronic generators and compensated cables. The demonstration shows Photons good operation with low jitter of less than +/-20ns.
    Proceedings of SPIE - The International Society for Optical Engineering 01/2005; DOI:10.1117/12.580373 · 0.20 Impact Factor
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    ABSTRACT: Experimental results of long-pulse generation in X-ray preionized XeCl lasers with the 9x7 cm2 and 5.4x3 cm2 apertures are described. The lasers operate in the Ne-Xe-HCl mixture with the pressure up to 4 atm. Paper-oil pulse forming lines and a rail-gap switch for the discharge pumping were used. A 3.5 and 10 J output with the optical pulse duration of 250-300 ns (FWHM) has been extracted.
    Proceedings of SPIE - The International Society for Optical Engineering 05/2004; DOI:10.1117/12.562962 · 0.20 Impact Factor
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    ABSTRACT: Experimental results of long-pulse generation in X-ray preionized XeCl lasers with a 9 x 7 cm2 and 5.4 x 3 cm2 apertures are described. Lasers operate at Ne-Xe-HCl mixture with pressure up to 4 atm. Paper-oil pulse forming lines and rail-gap switch for discharge pump was used. An 2 - 10 J output with optical pulse duration of 250 - 300 ns (FWHM) have been extracted. Problems and peculiarities of long laser pulse formation are discussed.
    Proceedings of SPIE - The International Society for Optical Engineering 01/2004; DOI:10.1117/12.558208 · 0.20 Impact Factor
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    ABSTRACT: An X-ray preionized XeCl laser with a large aperture (9x7 cm) is described. Laser operates at Ne-Xe-HCl mixture with pressure up to 4 atm. Paper-oil pulse forming lines and rail-gap switch for discharge pump was used. 10 J output with optical pulse duration up to 300 ns (FWHM) have been extracted from active volume 5.4 l with an electric efficiency 1.2%.
    Proceedings of SPIE - The International Society for Optical Engineering 12/2003; DOI:10.1117/12.515520 · 0.20 Impact Factor
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    ABSTRACT: A new method of insulator surface treatment, which allows the electric strength of the material to be increased, is proposed and verified. Using this method for treating the slow-wave structure of a relativistic backward wave tube (BWT), the microwave pulse duration was increased from ∼6 to ∼30 ns at an output BWT radiation power of 3 GW.
    Technical Physics Letters 01/2001; 27(2):150-152. DOI:10.1134/1.1352777 · 0.58 Impact Factor
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    ABSTRACT: Low-energy, high-current electron beam treatment of slow-wave structure was proposed to prevent spontaneous microwave pulse shortening in an X-band relativistic BWO at gigawatt level of output power. As a results, 3-GW, ∼30 ns microwave pulses were produced while the increase in the microwave pulse length and energy was a factor of four.
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    ABSTRACT: An excimer laser excited by electron beam pulses of microsecond duration and having an active volume of up to 30 liters was constructed. A detailed description is given of the operating characteristics of the electron accelerator. It is shown that for electron current densities of 10 A/cm2 and above one must take into account the focusing of the beam by its own magnetic field. An accelerator efficiency of 65% was achieved and an energy of 6 kJ was delivered to the laser chamber. Using XeCl, a laser output energy of 50 J was obtained with a specific output energy of 4 J/liter and an efficiency of ∼2%.
    Soviet Journal of Quantum Electronics 04/1987; 17(4):417-420. DOI:10.1070/QE1987v017n04ABEH007768