ISSN 0021-3454 (print version)
ISSN 2500-0381 (online version)
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Summaries of the issue

LASER-INDUCED MODIFICATION OF GLASS-LIKE MATERIALS

LASER-INDUCED PHASE-STRUCTURE CHANGES IN GLASS-LIKE MATERIALS Ageev Eduard I, Alexander V. Kolobov, Junji Tominaga
7
Analysis of experimental and qualitative theoretical studies of fundamental photochemical and photophysical processes in laser machining of glass-like ceramics is presented. Results related to glasses and glassceramics are compared to data on phase-change memory alloys. Controllable laser exposure can locally change the properties of the materials under consideration, e.g., its chemical solubility and transmittance in the visible and IR spectral ranges. In some cases, the process may be reversed, either thermally or by appropriately choosing the parameters of the laser exposure.
RECORD OF BRAGG GRATING IN AN ANISOTROPIC OPTICAL FIBER USING ArF EXCIMER LASER Petrov Andrei Anatolievich, Varzhel Sergey V., Kulikov Andrey Vladimirovich, David A. Palanjyan, Alexey I. Gribaev, Kirill A. Konnov
31
Record of Bragg grating by a single 17-ns pulse of ArF excimer laser in an anisotropic optical fiber with elliptical stress cladding is demonstrated. Results of visualization of fiber Bragg gratings induced in this type of birefringent optical fiber are presented.
LASER SPINNING OF SUBMICRO- AND NANOSIZED GLASS FIBERS Petrov Andrei Anatolievich, Vera A. Kochetova, Andrey D. Kochetov, Dmitry A. Sinev, Anastasia A. Yakusheva
36
In this paper we considered the process of sub-micron fibers growth on surface of glass-like material treated with focused beam of pulsed Yb-fiber laser is considered. eir Chemical composition of the fibers is determined, the nature of the fiber formation is clarified. The fibers diameters are shown to fall in the range between a few micrometers and some tens of nanometers.
LASER-ASSISTED FABRICATION OF WAVEGUIDE STRUCTURES IN THE BULK OF POROUS GLASS PLATES SODDEN WITH GLYCEROL WATER SOLUTION Roman A. Zakoldaev, Maxim M. Sergeev, Galina K. Kostyuk, Yakovlev Yevgeniy Borisivich
41
The process of laser-induced formation of waveguide structures in the bulk of porous glass plates sodden with glycerol, water solutions of glycerol, and distilled water, is studied. The applied laser radiation is slightly absorbed by the plate material.
MATHEMATICAL SIMULATION OF STRESS-STRAIN IN GLASS-CARBON MATERIALS UNDER ULTRAFAST LASER TREATMENT Tatiana N. Sokolova, Elena L. Surmenko, Ivan A. Popov, Yury V. Chebotarevsky
47
Application of ultrafast laser treatment of glass-carbon for field-emission cathodes manufacture is considered. The stress-strain state of glass-carbon plate under the action of picosecond laser pulses is analyzed with the use of mathematical simulation.

MODIFICATION OF SURFACE

54
On the bases of the analytical model of the laser-induced shock waves proposed by R. Fabbro et al., and the thermofluctuation theory of destruction of solids developed by S. N. Zhurkov, the mechanism of “wet” laser ablation of solids under a layer of liquid is studied. It is shown that ablated layer in the case of “wet” laser ablation may be three times as thick as for ablation in the air.
58
Computational thermodynamic approach is proposed for evaluation of phase-chemical composition of metal surface under laser oxidation in the normal atmosphere, depending on its bulk composition, laser exposure conditions, and composition of the atmosphere. The approach is used for analysis of laser heating of commercial titanium Grade 2 in the air.
LASER REMOVAL OF GRAFFITI FROM GLASS SURFACE Anastasia V. Strusevich, Yury A. Poltaev, Dmitry A. Sinev
65
Specifics of technology of laser-assisted removal of roughness and restoring of transparency of glass surfaces treated with acid-based paint are described. The technology combines advantages of laser cleaning and laser polishing in one processing step.
EMPLOYMENT OF FIBER LASER IN HARDENING OF THREADED COUPLING TO IMPROVE ITS WEAR PROPERTIES Volkov Mikhail Vladimirovich, Anton A. Kishalov, Khramov Valery Yu.
68
Results of experiments in hardening of threaded tube coupling with the use of ytterbium fiber laser are presented. The samples made from steel 38G2S type are used in the experiments. The treatment conditions, images of threaded parts microslices, as well as results of the wear resistance tests with the samples are demonstrated.

LASER SYSTEMS FOR ANALYSIS AND PROCESSING OF MATERIALS

73
A mathematical model developed to calculate characteristics of laser mirrors and non-planar ring optical cavities is described. Results of numerical simulation are compared with experimental measurements of laser mirrors characteristics and spectrum of modes for practically important four-mirror cavities with non-planar symmetric axial contour. It is shown that the proposed mathematical model may be applied for optimal choice of laser mirrors and cavities with the account for their real parameters.
METHODS OF CURRENT PULSE CORRECTION IN POWER SUPPLY UNITS FOR DIODEPUMPED LASERS Anatoly O. Temnikov, Alexey R. Gayoso de los Santos
79
The problems of designing power supply units for diode pumped laser are considered. Methods for solving the problems are presented. Principle of operation of various schematics used for correction of current pulse shape in power supply units for diode-pumped lasers is analyzed.
82
Application of the incoherent interferometry method to measure random mean square value of surface roughness of precision optical elements is considered. The results of measurements with the use of the white light interferometer CCI-2000 by Taylor-Hobson are compared to data obtained by the stylus profiler NV-6200 by Zygo.