LASER INSTRUMENT MAKING
HIGH-POWERED COMPACT ND:YAG LASER WITH UNSTABLE RESONATOR
Mikhail Inochkin, Viacheslav V. Nazarov, Kirill A. Fedin, Khloponin Leonid V, Khramov Valery Yu.
7
A new compact laser based on Nd:YAG crystals is presented. The developed laser generates light pulses with energy up to 800 mJ at the wavelength of 1064 nm; pulse duration comprises 3—5 ns, and the beam divergence is 0.6 mrad. Overall dimensions of the laser do not exceed 200´50´40 mm. Comparison of preliminary computer modeling results with experimental data shows a good agreement.
DIODE-PUMPED SOLID-STATE LASERS FOR 3-D SUBSURFACE MARKING OF TRANSPARENT DIELECTRIC
Gagarsky Sergey V., Peter Gnatyuk, Andrey N. Sergeev, Khramov Valery Yu.
12
Requirements to the kilohertz laser pulses parameters for local laser-induced changes in the refractive index of transparent dielectric are considered. Technical specifications of developed diode pumped solid-state lasers are presented, and several applications of the lasers to microtechnologies and research are discussed.
CONTROL OVER TEMPORAL CHARACTERISTICS OF ND+3:YAG:CR+4 MINI-LASER RADIATION WITH THE USE OF ACTIVE INTRACAVITY OPTICS
Gagarsky Sergey V., Vadim V. Kiyko, Vladimir A. Kondratyev, Vitaly A. Podvyaznikov, Andrey N. Sergeev, Viktor K. Chevokin
18
A mini-laser with passive Q-switch and an active output coupler based on Fabry — Perot interferometer is investigated experimentally. It is shown, that the use of active Fabry — Perot interferometer as the output coupler allows for control over temporal characteristics of generated laser pulses.
MODEL OF 3 m MULTYWAVE LASING OF DIODE-PUMPED ERBIUM CRYSTAL
Mikhail Inochkin, Viacheslav V. Nazarov, Dmitry Sachkov, Khloponin Leonid V, Khramov Valery Yu.
25
Results of theoretical investigation of lasing properties of selective-pumped Er:YLF, Er:YAG, and Er:YSGG lasers in single-pulse free-running mode are presented.
BACKWARD SRS COMPRESSION OF DIODE-PUMPED MICROCHIP LASER PULSES
Gagarsky Sergey V., Vadim V. Kiyko, Vladimir A. Kondratyev, Andrey N. Sergeev, Khramov Valery Yu., Victor E. Yakobson
31
Backward SRS conversion of laser pulses from diode-pumped passively Q-switched sub-nanosecond microchip laser is investigated experimentally. Backward SRS conversion efficiency above 50 % and pulse width compression coefficient of 6.4 are reported to be measured in BaNO3 crystal at kHz repetition rate. A scheme for additional amplification of the first Stokes component in the so-called “kegel” mode of microchip laser generation is proposed.
OPTO-THERMAL FIBER CONVERTER OF LASER RADIATION
Alexei Skripnik
37
A new perspective type of laser converters – the fiber-optic thermal converters (FOTC) applied for transformation of output fiber-laser radiation energy into heat is considered. The converters are used in modern medicine for contact laser treatment of biological tissues. The converter formation process is described, dependence of the optical transmission and surface temperature of FOTC on average power of semiconductor laser radiation is investigated.
LASER TECHNOLOGIES
LASER TEXTURING OF HARD TISSUES
Belikov Andrey V., Alexei Skripnik, Ksenia Shatilova
43
A method of laser texturing of hard tissues of human teeth with erbium lasers radiation in ablative and sub-ablative modes is described. A positive effect of laser texturing on mechanical and chemical properties of the tissue surface and quality of filling material joint with the textured tissue surface is reported.
LASER-ASSISTED SYNTHESIS OF NANO-SIZED CARBON STRUCTURES
Belikov Andrey V., Alexei Skripnik, Zulina Natalia A
50
A method for deposing a coating containing nano-sized carbon structures on hard biological tissues is presented. The structures are produced by carbon emission from graphite in the air under the action of millisecond pulses from Glass: Yb, Er laser.
PROPERTIES OF OPTICAL AND LASER EMITTERS
SPATIAL AND ENERGETIC CHARACTERISTICS OF LIGHT-EMITTING DIODES USED IN PHOTOCHROMOTHERAPY
Веселовский А. Б., Pavel I. Guzalov, Vera V. Kiryanova, Митрофанов А. С., Фефилов Г. Д., Khramov Valery Yu.
57
The up-to-date approach to the problem of choosing light-emitting diodes for photochromotherapy is considered. Results of studies on energetic characteristics and spatial distribution of LED radiation are presented. A physiotherapeutic apparatus developed with the account for the results is described.
STUDY ON APPLICATION OF SEMICONDUCTOR LASER TO DIFFRACTOMETRY
Веселовский А. Б., Митрофанов А. С., Фефилов Г. Д.
62
Spatial coherence of semiconductor laser with the wavelength of 630 nm is studied experimentally. Revealed high degree of spatial coherence is shown to allow for application of the laser to diffractometry. The possibility to obtain diffraction pattern of sufficient contrast is demonstrated by the example of slit diffraction of radiation generated by the laser under consideration.
DIFFRACTION TECHNIQUE ACCURACY IN MEASUREMENT OF ROUND MICROOBJECT ILLUMINATED BY SPATIALLY INHOMOGENEOUS LIGHT
Веселовский А. Б., Митрофанов А. С., Фефилов Г. Д.
65
The effect of symmetrical and asymmetrical inhomogeneity in spatial distribution of illuminating light field amplitude on diffraction pattern is considered. Relative variation of intervals between minimums in Fraunhofer diffraction pattern for Gaussian beam diffraction on a circular aperture is analyzed.
ANALYSIS OF OPTICAL RADIANCE POWER AND TEMPERATURE OF UV LED CHIPS IN THE PULSED MODE
Yury N. Vedernikov, Ivan A. Ermakov, Papchenko Boris P., Alexander N. Pichugin, Eugene V. Tarakanov
69
Operation of UF light emitting diodes in the pulsed mode at elevated working current and voltage is investigated. Results of measurements of optical power of generated radiation and temperature of the UV LED chips are presented.
OPTICAL INSTRUMENT MAKING
DETERMINATION OF CONTRAST SENSITIVITY FUNCTION FOR TECHNICAL VISION SYSTEM
Bezzubik Vitaly Veniaminovich, Nickolay R. Belashenkov
73
A mathematical model is developed for determination of contrast sensitivity function of technical vision system. The model is based on an idea of functioning of receptive fields of human vision system. Aquantitativemeasureofdigitalimagecontrastisproposed. Comparative analysis of the model data and experimental data on contrast sensitivity of human vision system is performed.
MODEL OF VISUALIZATION FOR RANDOM PHASE OBJECT
Mark V. Okulov
80
Dependence of contrast degree in image plane of visualizing system for phase inhomogeneities on lateral movement of spatial frequency filter is considered. A model of such a system based on the method of spatial optical filtering is presented.
MICROPROJECTOR SYSTEMS OF MIXED AND AUGMENTED REALITY WITH PLANAR WAVEGUIDE SCREEN
Гримм В. А., Maria S. Rudakova, Смирнов С. А.
84
Architecture of microprojector system with two-dimensional raster structure realized with planar optical fiber (wave guiding) elements is considered. Variants of the system schematic are presented, calculations are carried out to justify the choice parameters of prismatic elements comprising the planar waveguide screen — tilt angle and the reflection of layers — for a given field-of-view dimension.
89
Method of optimal spatio-temporal signal filtering in laser refractometry of microobjects is developed. Principle of operation of spatio-temporal tunable filter is based on piecewise-linear approximation for virtual model of the filter. Results of experimental testing of the filter are presented.
