A5075487658- Laser Material Processing Techniques
- Optical and Acousto-Optic Technologies
- Diamond and Carbon-based Materials Research
- Optical measurement and interference techniques
- Photoacoustic and Ultrasonic Imaging
- Advanced Vision and Imaging
- Nonlinear Optical Materials Studies
- Optical Coherence Tomography Applications
- Laser-induced spectroscopy and plasma
- Image Processing Techniques and Applications
- Advanced Optical Imaging Technologies
- Photorefractive and Nonlinear Optics
- Digital Holography and Microscopy
- Ocular and Laser Science Research
- 3D Surveying and Cultural Heritage
- Calibration and Measurement Techniques
- Optical Polarization and Ellipsometry
- Spectroscopy and Chemometric Analyses
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Fiber Laser Technologies
- Metal and Thin Film Mechanics
- Laser-Ablation Synthesis of Nanoparticles
- Thermography and Photoacoustic Techniques
- Bee Products Chemical Analysis
- High-pressure geophysics and materials
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2023-2025
Federal State Budgetary Institution of Science "Scientific and Technological Center of Unique Instrumentation" of the Russian Academy of Sciences
2016-2024
Bauman Moscow State Technical University
2014-2024
Russian Academy of Sciences
2018-2022
Moscow Power Engineering Institute
2017-2020
Lomonosov Moscow State University
2020
National Research University Higher School of Economics
2017-2019
All-Russian Scientific Research Institute of Physical-Technical and Radiotechnical Measurements
2019
Moscow Aviation Institute
2019
Optolink (Russia)
2014
Spatiospectral structure of wave phase matching in birefringent crystals has a strong dependence on the geometry acousto-optic interaction and incident light spectrum. This defines details beam profile transformation. It is especially important for imaging applications related to large angular aperture wide spectral bandwidth light. In this paper, we demonstrate accurate three-dimensional plotting transmission pattern without small birefringence approximation. The rather complicated shape...
The single-pass one-step method for printing conductive silver tracks on a glass surface, using the laser-induced forward transfer (LIFT) technique, was proposed, providing unique opportunity high-throughput of surface micro- and nanostructures with high electrical conductivity positioning accuracy. This developed via our multi-parametric research, resulting in selection optimal material, laser irradiation, conditions. Optical, scanning transmission electron, atomic force microscopy methods,...
Raman microspectroscopy has become an effective method for analyzing the molecular appearance of biomarkers in skin tissue. For first time, we acquired vitro spectra healthy and malignant tissues, including basal cell carcinoma (BCC) squamous (SCC), at 532 785 nm laser excitation wavelengths wavenumber ranges 900-1800 cm-1 2800-3100 analyzed them to find spectral features differentiation between three classes samples. The intensity ratios bands 1268, 1336, 1445 appeared be most reliable...
We propose a new technique for three-dimensional (3-D) imaging in arbitrary spectral intervals. It is based on simultaneous diffraction of two divergent stereoscopic light beams single acoustic wave propagating uniaxial birefringent crystal. discuss detail this configuration acousto-optic (AO) interaction, derive basic relations, and experimentally demonstrate the applicability proposed approach to 3-D imaging. A stereo-imager type may be produced as an ultra-compact embeddable optical...
Micromodification in bulk undoped polymethylmethacrylate (PMMA) by single focused (numerical aperture (NA) = 0.25), 1030-nm 250-fs laser pump pulses was explored self-transmittance; optical, 3D-scanning confocal photoluminescence (PL); Raman micro-spectroscopy; and optical polarimetric interferometric microscopy. Starting from the threshold pulse energy E th 0.4 ± 0.1 μJ (peak intensity I ≈ 8 TW/cm 2 ), visible bright micro-voxels emerged inside PMMA at 100 ÷ 300-μm depth, with their...
Red diamond synthesized at high pressure and temperature (HPHT) was exposed to ultrashort (150 fs) laser pulses with a wavelength (4673 nm) corresponding the intrinsic two-phonon absorption of diamond. The structures were obtained using reflective objective numerical aperture (NA) 0.5. arrays laser-irradiated micrometer-scale regions characterized by optical transmission microspectroscopy, stationary 3D-confocal photoluminescence (PL) microspectroscopy room temperature, FTIR microspectroscopy.
Spectral image filtration by means of acousto-optical tunable filters (AOTFs) has multiple applications. For its implementation, a few different optical schemes are in use. They differ quality, number coupling components, dimensions and alignment complexity. To choose the system AOTF-based spectral imager properly, many factors have to be considered. Though various acousto-optic (AO) been tested discussed, their comparative analysis not reported up now. In this study, we assembled four most...
FT-IR spectroscopy is the basic finger-print method for qualitative and quantitative analysis of nitrogen, boron, hydrogen impurities in natural synthetic diamonds. In measurements impurity concentrations, external standard samples are required calibration procedure during analysis. this study, double-phonon mid-IR absorption coefficient optical phonons diamond host matrix, robust internal standard, was accurately measured tens diverse samples, thus enabling precise calibrated ultra-low...
We report on wavelength-multiplexed digital holographic imaging based simultaneous Bragg diffraction of wideband light by several ultrasound waves different frequencies in crystalline media. This technique is easy to implement, avoids spectral scanning, and applicable various holography schemes. It also enables single-shot acquisition a few fringe patterns single monochrome sensor wavelength demultiplexing the resulting interferogram. have assembled Mach-Zehnder interferometer with an...
We address the optical design procedure of prism-based stereoscopic imaging systems. Conventional approach includes two sequential stages: selection hardware and development proper digital image processing algorithms. At each these stages, specific techniques are applied, which almost unrelated to other. The main requirements system include only key parameters quality. Therefore, insufficient measurement accuracy may be revealed after prototype is assembled tested. In this case, even...
A rather narrow field of view (FOV) has always been considered as an essential limitation spectral imagers based on acousto-optical tunable filters (AOTFs). We demonstrate a computational technique to overcome this constraint. It is preliminary precise spectral-angular characterization beam transformation caused by light diffraction acoustic wave and consequent correction acquired stack images. This applicable for any geometry acousto-optic interaction opens the way development AOTFs with...
Tightly focused 515-nm, 0.3-ps laser pulses modify in a filamentation regime the crystalline structure of an Ib-type high-pressure, high-temperature (HPHT) synthesized diamond thin-plate form. The modified microregions (micromarks) yellow and colorless crystal zones, possessing different concentrations elementary substitutional nitrogen (N) impurity atoms (C-centers), exhibit their strongly diminished local IR absorption (upon correction to thickness scaling factor). Simultaneously,...
Modern videoendoscopes are capable of performing precise three-dimensional (3D) measurements hard-to-reach elements. An attachable prism-based stereo adapter allows one to register images from two different viewpoints using a single sensor and apply stereoscopic methods. The key condition for achieving high measurement accuracy is the optimal choice mathematical model calibration 3D reconstruction procedures. In this paper, conventional pinhole camera models with polynomial distortion...
Abstract Acousto-optic (AO) anisotropic interaction in uniaxial birefringent crystals is a widespread and versatile approach to tunable spectral filtration of light. Its principal constraints are limited values angular bandwidth restricting the light transmission imaging performance AO filters. A way overcome these drawbacks simultaneous Bragg diffraction two or more beams. In this paper, we discuss compare main features four available modes wide-aperture interactions crystals. We calculate...
An ultrashort-pulse laser inscription of embedded birefringent microelements was performed inside bulk fluorite in pre-filamentation (geometrical focusing) and filamentation regimes as a function wavelength, pulsewidth energy. The resulting elements composed anisotropic nanolattices were characterized by retardance (Ret) thickness (T) quantities, using polarimetric 3D-scanning confocal photoluminescence microscopy, respectively. Both parameters exhibit monotonous increase versus pulse...
De-noising of terahertz pulsed spectroscopy (TPS) signals is an essential problem, since a noise in the TPS data samples makes correct reconstruction sample spectral dielectric properties and internal structure challenging. It especially important for regions where detector sensitivity typically low. A lot effective techniques 1D 2D signal de-noising based on processing wavelet-domain have been developed recent times. The present work demonstrates ability to perform using algorithm Fast...
Nowadays, stereoscopic devices are widely used for precise three-dimensional (3-D) measurements of hard-to-reach elements in industrial and biomedical applications. The most common approach their implementation is the utilization prism-based optical systems, which allows simultaneous acquisition two images from different viewpoints on a single sensor. Normally, they equipped with wideband (WB) white-light source, but contrast visualization inspected object and, therefore, accurate...
Subject of study. Off-axis digital holograms were obtained with the acousto-optic spectral filtering broadband radiation. Aim Methods for controlling parameters double evaluated in terms increasing coherence length light and improving quality off-axis holograms. Method. For measurements, an holography setup based on a classical Mach–Zehnder interferometer was used. The lighting part contained radiation source two acousto-optical cells possibility separate control their frequency orientation....