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Proceedings of CAOL'2003. 1st International Conference on Advanced Optoelectronics and Lasers. Jontly with 1st Workshop on Precision Oscillations in Electronics and Optics (IEEE Cat. No.03EX715)
In this work for the first time we have developed a novel and efficient techniques for characterization of nonlinear and laser materials by using a time-resolved photoelectric spectroscopy which allows the measurements of the form of laser pulse as well as the pulse photocurrent (PPC) appearing in the crystal during laser excitation with the time window about 0.1 ns. For the excitation of crystal...
The lidar equation computer simulations have been fulfilled earlier and it has been concluded that fluorescence lidar (FL) is the most preferable for the detection of iodine molecules at very low concentration levels. The goal of this report is the molecular iodine FL lidar backscattered fluorescence intensity vs. iodine partial pressure or concentration in special cuvette dependences experimental...
In light of the well-established limitations of Er indiffusion technique, Er exchange technique, inducing unusual chemical bonding rearrangement and evident crystal structure modification, appears to open new possibilities for selective manipulation of phonon-assisted processes in Er:LiNbO3 and, hence, for suppression of upconversion. Our experimental study evidenced a significant and very interesting...
In this paper, we propose an inverse dispersion fiber (IDF) whose chromatic dispersion is designed to compensate for that of conventional 1.31 mum zero-dispersion single-mode fibre (standard single-mode fiber-SSMF). The proposed fiber has a major enough effective area and a small macrobanding loss. The fundamental part of the intensity focused in a central part of a core, that in a place with rather...
There is analysed the possible reason show statistics of scattering measured by the different methods of PMD values of single-mode fiber (SMF) or light guide in this paper. Also, it is shown that the difference of PMD values of SMF by the different methods can bring to essential lowering of passability of SMF established testing by IEC and ITU-T. The calculation of link design value, PMDQ and DGDMAX...
The precision positioning of optic fibers and component details is a main problem in fiber connectors and fiber splicing. As it is known, the exceeding of allowable misalignments of optical fibers has influence on the significant growth of insertion optical losses. Therefore the determination, of a positioning objects space disposition relatively base coordinates is an important moment. Therefore...
Most frequently used radiation wavelengths in systems on a basis singlemode optical fiber (SMOF) are lambda=1,3 mum and lambda=1,55 mum appropriate minimal dispersion and the minimal radiation power losses, accordingly. The given range of wavelengths cover, in particular, germanium avalanche photodiodes (APD). First, the use of APD is caused by use of the optical fiber in the length up to several...
Transfer characteristics of planar optical waveguide sections containing a bend are investigated in the offered work. The method of losses account on the waveguide bends, was used to define transfer characteristics. The optimisation directions of the characteristics of filters on the optical waveguide bend assume search and synthesis of new glass structures ensuring a given change of refractive index...
In this work we studied experimentally the dynamics of beam-coupling amplification on a reflection gratings at light-induced absorption in Bi12TiO20 crystals doped by different impurities. Doping with different impurities modifies the photorefractive properties of these crystals
We have characterized 3.4 mum wavelength InAsSbP/InAs light emitting diodes grown as double heterostructures by liquid phase epitaxy with a 300 mum wide aperture coupled with As2S3 naked fibre. The output power, far field pattern and spectral characteristics depend on chemical composition of liquid being in contact with fibre making feasible evanescent wave analysis of liquids contenting water and/or...
In the present time the obtaining of an operative information on the state of an environment is extremely urgent in connection with probable ecological consequences of pollution of an atmosphere, water media, and underlying terrain. Laser location methods are the most suitable for the solving of this problem since they have such important advantages, as remoteness, immediacy, high spatial resolution...
The increasing of the measurement accuracy of pulses temporary situation in information sequences is an urgent problem. In these systems the information signal represents a number of optical pulses reflected from environment heterogeneous, coming during 1-10 mus depending on probing range. For registration and processing such signals was offered and realised opto-electronic vernier method of definition...
Our paper describes a new type of optical deflector, based on the breaking of the total internal reflection by the transference of isotropic insulating liquid in capillary by meaning of ponderomotive force, acting on liquid in the electric field. Theoretical modeling of liquid flow process in capillary, driven by ponderomotive force, has been done. The using results of this modeling, theoretical dependencies...
In the report the theory of "calibration-free" measurements of optical characteristics of an atmosphere, water, solutions, transparent for light optical devices is considered. This theory is based on the use of cumulative measurements allowing one to exclude an influence of instrumental constants of various system blocks thanks to a choice of appropriate measurement geometry. The concrete...
It is often necessary to measure the size of small particles. For this purpose, optical methods are used much oftener. These methods employ the fact that the shape of scattering indicatrix and intensity of scattered light depend on the size of these particles and the wavelength of incident radiation. There are two techniques of measuring: 1) At the fixed wavelength, the intensity of scattered light...
In this paper the photothermal method of experimental determination of thermal and physical parameters of construction materials in particular the measurement of thermal capacity and thermal conductivity has been developed. The investigated material sample is radiated by the high-power laser beam. The surface deformations change dynamics of the investigated sample is experimental registered by the...
The method of the laser homodyne vibrometry is very actual in the diagnostics of modem technique. This method is highly effective when the vibration surface is covered with the film or the paint containing microscopic glass balls or prisms, and the laser beam is focused on the surface. The preliminary research work showed that the exactness of focusing determines the linearity of measurement and the...
The simple Z-scan experiments is an effective tool for investigations of nonlinear optical properties of different materials. In this paper Z-scan technique is used to investigate the photorefractive optical nonlinearity of lithium niobate (LiNbO3 ) with surface doping by both, iron (Fe) and copper (Cu) ions
Despite of the existence of a number techniques for the study of GaAs crystal structure, creation of the method for research of a deflection extent of its composition from the stexiometrical GaAs compound (a solid state) still remains actual. In the given research such a method based on dependence of the photoquenching energy of the photoluminescent (PL) bands caused by the EL2 defects upon the vacancy...
For the needs of optical storage and optical communication the nonvolatile photorefractive gratings (PG) both in bulk and waveguide samples of electrooptic crystals are of great interest. In this paper we investigate an influence of an incoherent green illumination to both, optical absorption for the red light and characteristics of photorefractive grating which are recorded by the external coherent...
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