Olga Andreeva

Olga Andreeva
ITMO University | SPbNRU ITMO · Department of Photonics and Optical Information Technology

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61
Publications
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153
Citations

Publications

Publications (61)
Article
We present the results of a study of milk as a complex biological fluid. The simultaneous occurrence of both direct and reverse sedimentation associated, respectively, with the protein and fat components of milk is demonstrated. Digital holographic interferometry enables the determination of the spatial and temporal changes in the refractive index...
Article
A theoretical study of phenanthrenequinone-doped polymethyl methacrylate (PQ/PMMA) samples parameter changes during irradiation is presented. The research has been carried out on the basis of the experimental study (Part 1, [Appl. Opt.56, 7351 (2017)APOPAI0003-693510.1364/AO.56.007351]) and a mathematical model that describes space–time reversible...
Article
Full-text available
In this paper the research of possibility of using method of dynamic light scattering for early diagnosis of oncological diseases during studying of preparations of biological fluids is presented.
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This paper presents experimental results of changing optical parameters of polymeric recording medium Difphen samples during exposure process. The nature of changes of the average refractive index and sample thickness is considered, quantitative estimations of spatio-temporal changes of these parameters are given.
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In this paper the research of optical heterogeneity of nanoporous silicate matrices (NPM) by method of digital holographic interferometry (DHI) is presented.
Article
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The usage of the method of digital holographic interferometry (DHI) for the study of fine dispersed suspensions of inorganic substances in the process of their sedimentation was proposed. It is shown that during research of nanosuspensions with particle sizes less than 400 microns method of DHI allows to reveal changes of parameters with greater pr...
Chapter
In the last years, nanoporous materials applications in biology and medicine have been widely researched. One of the problems in this field is the transport process in nanoporous media. This work presents the numerical model and experimental data for imbibition. The model simulates the motion of the front of the liquid, two-dimensionally imbibing t...
Article
Experimental research into changes of the optical thickness of phenanthrenequinone-doped polymethyl methacrylate samples in the process of irradiation by a 473 nm laser is presented. It was demonstrated that heating-induced reversible changes lead to a decrease in the optical thickness. The temperature coefficient of the relative changes of the opt...
Article
The optical properties of colloidal silver particles formed photographically in high-resolution silver halide photographic materials have been considered. The conditions that allow one to obtain exposed and developed light-sensitive silver halide particles in the form of colloidal particles of metallic silver having the properties of localized plas...
Article
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The research of aqueous suspensions of colloidal particles of silver obtained by photographic method was carried out, two optical methods were used: the standard photometric method and the method of dynamic light scattering. It is shown that in the researched preparations, which attenuation spectra in the visible region have a close form, distribut...
Article
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In the work were proposed to use the method of digital holographic interferometry on the example of suspensions of fine dispersed silica, developed by different ways, for studying fine dispersed suspensions of inorganic substances in combination with the process of their sedimentation. A comparison of experimental results obtained by this method an...
Article
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The results of experiments that allow to evaluate changes of optical parameters of polymeric recording medium with diffusional amplification occurring during recording of information are presented. It is shown that phase characteristics of the sample compared to its initial state are observed during recording of information and in the post-exposure...
Article
A technique for complex investigation of the process of free liquid convection under the action of a heat source is presented, which is based on the use of digital holographic interferometry. The mode of studying an object, which is a flat liquid layer in a glass cell, has been developed. Experimental results have been obtained in the form of space...
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The object of the study in this paper – silver nanoporous silicate matrix with pore size less than 20 nm. Colloidal silver particles with volume concentration about 10−4 are formed within free volume of pores of silicate matrix by chemical method. Changes in the attenuation spectra of the investigated object during changing of the refractive index...
Article
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Convection is a process of transfer liquid from a hot region to a cool region. This phenomenon is involved in many physical processes. The main characteristic of convection is a temperature field. Modelling of convection allows to get the information about temperature field at any time of process. In this paper the results of modelling natural conv...
Article
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The results of experiment on the influence of temperature of the environment on the parameters of the volume polymer holograms are presented. The experiments were carried out on specialized holographic setup using digital procedures of recording information and data processing in the range of temperature change (22÷32)°C. It was shown that for holo...
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In this article we presented a technique for applying the methods of digital holographic interferometry to analysis the processes, occurring in fluid and solid translucent media under the action o heat sources. The experiments were performed at a small-size stand with the use of a CMOS matrix for recording digital holograms and a computer terminal...
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The work presents the experimental results on assessment of the impact of the ambient humidity variation on parameters of silver-containing volume holograms in nanoporous silicate matrices 1 mm thick. The experiments were conducted on a dedicated holographic stand with the use of digital methods of data recording and processing. The diffraction ang...
Conference Paper
The digital holographic interferometry methods that are used in this work nowadays is widely applied to research of temporal dynamics of objects transformation in different processes [1, 2]. Authors use developed stand and software that are used for detecting and controlling of phase changes of transparent objects with time resolution not less than...
Article
The methods of “dry” synthesis of Ag-AgI hybrid nanostructures in the bulk of nanoporous silica glass with an average pore size of 17 nm have been described. Spectral characteristics of obtained nanocomposites have been presented. The possibility of forming the Fano resonance due to the electromagnetic coupling between AgI excitons and Ag plasmons...
Article
The kinetics of the relaxation processes in silver iodide nanocrystals synthesized in a nanoporous silicate glass matrix and excited by femtosecond laser pulses has been experimentally studied. A short-lived characteristic transmission band is found to be formed in the spectral range of exciton absorption of nanocrystals. The specific features of p...
Article
It is experimentally demonstrated that the point electron-beam irradiation of a nanoporous silicate glass leads to the appearance of or significant increase in the UV-excited luminescence from the entire sample in the spectral intervals of 500–700 and 900–950 nm. The observed effect is related to (i) partial reduction of SiO2 and H x SiO y phases b...
Article
A microhologram-multiplexing method that makes it possible to increase the rate at which information is recorded and read out is proposed and investigated. An optical system for implementing the given method has been developed and experimentally tested. It is shown that holograms can be multiplexed by using a multichannel recording head, and that t...
Article
The new modified holograms multiplexing method using normal to holographic recording media reference beam incidence and off-normal signal beams incidence is offered for application in holographic memory system having high information capacity and high data rate. Signal beams are located around reference beam concentrically. In this case quantity of...
Article
This paper presents the results of a study of the parameters of hologram-gratings recorded on samples of polymeric medium with phenanthrenequinone during long-term storage and operation. It is shown that there was no appreciable degradation of the main parameters of the holograms over a period of 5-9years.
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This paper discusses the principle of the diffusion development of photoinduced holographic gratings with the use of photoattached molecules and its use in creating shrink-resistant photo-sensitive media for volume holography and in studying polymeric materials by a holographic relaxation method. It discusses how the composition, the fabrication me...
Article
This paper discusses a method for obtaining multiplex holograms on Diffen polymeric recording medium with independent heating of the superimposed hologram-gratings. The parameters of the holograms are measured at various stages, and it is shown to be possible to obtain six hologram-gratings with 50% diffraction efficiency in the linear recording re...
Article
Fullerene-containing solid-state matrices were studied theoretically and experimentally as the active material for all-optical switching devices. Dynamics hologram recording and spectral analysis were used to study temporal stability and efficiency of nonlinear response of the media. Porous glass and polymethylmethacrylate hosts were utilized as C6...
Conference Paper
A broadband laser-based technique for investigation the parameters of spectral selectivity high-selective volume hologram is suggested. The studies, carried out by this method, were realized with using radiation of femtosecond and semiconductor lasers. The transmission phase holographic gratings recorded on polymer recording media samples of 1-2 mm...
Article
This paper discusses the results of an investigation of the recording of composite nanoporous photographic materials with a photosensitive composite made from silver halide in gelatin, developed and created at S. I. Vavilov State Optical Institute.
Article
This paper discusses how the parameters of nanosecond pulsed radiation affect the process of obtaining holograms in the Diffen polymeric medium. It is shown that the transmittance of unexposed samples and the effective thickness of recorded holograms depend on the power density of the pulsed radiation.
Article
A technique is proposed for investigating the spectral selectivity of volume holograms when a KLM-650/3 semiconductor laser module is used as a radiation source in the incoherent-radiation-generation regime.
Article
This paper presents the results of studies of the hardness of samples of the material Diffen at various stages of the production of holograms by a technique developed by the authors. It is shown that, when high-efficiency holograms are being produced, the main contribution to the variation of the hardness of the material comes from postexposure hea...
Article
In connection with the development of the new scientific and educational specialization of optoinformatics, a Web site has been created that presents proposed educational standards for the training of specialists in this subject and exhibits the materials of lecture courses and experimental courses on the given topic, given at the St. Petersburg Un...
Article
This paper shows that it is possible to record holograms with laser pulses in samples of the Diffen polymeric material with the same effective thickness as when recording holograms with continuous radiation. © 2004 Optical Society of America
Article
The results of a complex investigation of the recording of dynamic holograms by pulsed radiation with a duration of 20 ns and 300 ps in fullerene-containing media based on porous glasses and polymethyl methacrylate matrices are reported. Spectral analysis of these media in the range 300–700 nm was performed. The efficiency of hologram recording was...
Article
A method for studying the parameters of high-selectivity volume holograms and photonic crystal structures using ultrashort pulsed radiation in a wide spectral range is developed. The experimental system and measurement procedure are described. The results of determination of the diffraction efficiency and spectral selectivity of holographic grating...
Article
The results of experimental investigation of dynamic holograms recording by 20 ns and 300 ps laser pulses in fullerene-containing solid-state matrices are presented in this paper. The spectral analysis in range 300-700 nm shows correlation between efficiency of dynamic holograms recording and presence of absorption band at nearly 330 nm. We use two...
Article
The results of experimental investigation of dynamic holograms recording by 20 ns and 300 ps laser pulses in fullerene-containing solid-state matrices are presented in this paper. The spectral analysis in range 300 - 700 nm shows correlation between efficiency of dynamic holograms recording and presence of absorption band at nearly 330 nm. We use t...
Article
We report the theoretical and experimental results of dynamic holograms recording in nano-size porous glasses containing fullerine C60 and its use for optical limiting. To record a grating with spatial frequency 20 mm-1 we used laser pulses with 18 ns duration and 532 nm wavelength. Initial transmittance of the samples varied from 30% to 70%. We fo...
Article
A plan for the presentation of instructional material on the basic properties of three-dimensional holograms is described. It calls for the use of a demonstration apparatus based on a volume transmission hologram with a thickness of 1 mm, prepared at the Vavilov State Optical Institute. The apparatus may be used as an accompaniment to lecture mater...
Article
Full-text available
The results of experimental and theoretical investigations of dynamic hologram recording and optical limiter improvement in nano-size porous glasses containing fullerene C60 and toluene solution of C60 are presented. TO record a grating with spatial frequency 20 mm-1 we used laser pulses with 18 ns duration and 532 nm wavelength. Initial transmitta...
Article
This paper presents the results of experiments on estimating the hardness of polymeric samples using the Vickers method. It is shown that the technique described here can be used for pre-exposure monitoring of a polymeric recording material. (C) 2002 Optical Society of America.
Article
Full-text available
The recording geometry and recording media for the method of achromatic wavefront reconstruction are discussed. The femtosecond recording on the thick slabs of dichromated gelatin and the samples of silver-containing porous glass was obtained. The applications of the method to ultrafast laser spectroscopy and to phase conjugation were suggested.
Article
This paper presents the results of an experimental and theoretical study of dynamic holograms in a toluene solution of fullerene C-60 in a sample cell and introduced into nanoporous glass. It is experimentally shown that, when flat dynamic holograms are written in these media, high orders of self-diffraction are observed, the number of which increa...
Conference Paper
The results of experimental and theoretical investigations of dynamic hologram recording and optical limiter improvement in nano-size porous glasses containing fullerene C-60 and toluene solution of C-60 are presented. To record a grating with spatial frequency 20 mm(-1) we used laser pulses with 18 ns duration and 532 nm wavelength. Initial transm...
Article
This paper discusses fullerene-containing porous glasses. It is shown that such glasses are a promising material for creating optical items based on fullerenes.
Article
Full-text available
This paper presents the results of experiments that demonstrate that high-efficiency transmissive holograms can be obtained on porous silver-containing volume media by recording with femtosecond laser pulses in the periodic lasing regime. (C) 2001 The Optical Society of America.
Article
This paper presents the results of holographic studies of a new volume photosensitive polymeric material that makes it possible to carry out postexposure amplification of recorded holograms. The dependences of a number of parameters of transmissive holograms on postexposure heating time are obtained. A technique is proposed for determining the phas...
Article
Studies of the parameters of silver-containing porous holograms are presented, and estimates are given of their phase modulation when the free volume of the pores is filled with immersion liquids with various refractive indices. Holograms are obtained with a high diffraction efficiency not only in the red but in the near-IR region.
Article
Parameters of silver-containing porous holograms are measured, and their phase modulation is estimated. Phase modulation of such holograms is shown to be sufficient for the production of high-efficiency holograms in the near-IR spectral range with a high transparency of the recording medium, in spite of the fact that its magnitude decreases by a fa...
Article
The studies have been performed on new volume (about 1 mm thick) recording medium based on porous glasses and light-sensitive silver compounds. It was shown that the materials of the sort makes it possible to create holograms with high values of phase modulation not only in visible, but also in near infrared spectral regions. The essential feature...
Conference Paper
An analysis of Focar-S a new material for 3-D holograms recording is carried out. The new material comprises a heterogeneous medium based on porous glass and silver halide as a light sensitive substratum. There are some characteristics of obtained holograms for both non-developed and developed samples. INTRODUCTION. FOCAR-S -MEDIUM FOR 3-D HOLOGRAM...
Article
The use of the FP-GT film for three-dimensional hologram recording is investigated experimentally. The exposure and holographic characteristics of the film are compared to those of the LOI-2-63 high-resolution plates. Exposure conditions in recording reflection holograms are defined.
Article
The use of dilute hydroquinone developer (PRG-1) for the development of three-dimensional holograms is investigated experimentally. This developer contains no rare or toxic substances and is characterized by high stability and good reproducibility of results. Diffraction efficiency and optical density obtained with the PRG-1 and the widely used GP-...
Article
It is shown that a heat treatment of photographic layers before exposure makes it possible to increase their sensitivity considerably. The heated photographic layers ensure obtaining holograms that have a high diffraction efficiency and exhibit practically no shrinkage.

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Projects (2)
Project
The non-holographic mechanism of achromatic wavefront reconstruction is based on a geometric-optical reflection of reconstructing radiation from surfaces with constant phase differences between the object and reference waves used to record the interference fringe structure in the medium bulk. We develop its experimental and theoretical study.