Research and Technological Institute of Optical Materials Science

Saint Petersburg, Russia

Research and Technological Institute of Optical Materials Science

Saint Petersburg, Russia
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Donato M.G.,CNR Institute for Chemical and Physical Processes | Gagliardi M.,CNR Institute for Microelectronics and Microsystems | Sirleto L.,CNR Institute for Microelectronics and Microsystems | Messina G.,University of Reggio Calabria | And 3 more authors.
Applied Physics Letters | Year: 2010

In this paper, the optical dispersion properties and the Raman gain of sodium phosphate glasses containing niobium oxide at increasing concentrations have been systematically investigated, with the aim of establishing a potential enhancement of the Raman gain and its bandwidth with respect to silica. A broadening of the bandwidth and a higher peak Raman gain (approximately 17 times) than in silica glass have been observed at high niobium oxide molar content. Our findings point out that sodium-niobium-phosphate glasses could be utilized for the realization of Raman amplifiers. © 2010 American Institute of Physics.


Lipovskii A.A.,Saint Petersburg State Polytechnic University | Rusan V.V.,Research and Technological Institute of Optical Materials Science | Tagantsev D.K.,Saint Petersburg State University
Solid State Ionics | Year: 2010

A new technique to imprint phase and amplitude patterns into glass is proposed. The technique is based on the thermal poling of oxide glasses via a figurate plane anode which has a relief with a given 2D modulation of the pattern depth. Poling with such an anode results in the subsurface layer depleted of high-mobility ions and characterized by 2D modulation of its thickness directly determined by the relief of the anode pattern. Due to the 0.02 difference in refractive indices of the depleted layer and bulk glass, glasses poled via the figurate anode operate like optical phase structures, e.g. diffraction phase gratings in the case of a regular pattern. It is found that phase contrast in such structures (for the glasses used in this work) increases linearly with the total charge passing through the glass sample in the process of poling, with the maximal achieved phase contract of 1.32π. If initial glass contains silver ions, the bottom of the depleted layer can be treated as a latent relief image of the anode relief pattern, which can be visualized by heat treatment in H2 atmospheres due to the formation of silver nanoparticles absorbing visible light. Physico-chemical processes involved in the structure formation are discussed. © 2010 Elsevier B.V. All rights reserved.


Akchurin M.Sh.,RAS Shubnikov Institute of Crystallography | Gainutdinov R.V.,RAS Shubnikov Institute of Crystallography | Garibin E.A.,Joint Stock Company | Golovin Yu.I.,Tambov State University | And 10 more authors.
Inorganic Materials: Applied Research | Year: 2011

The real structure of samples of optical fluoride ceramics is studied by atomic force, scanning electron, and transmission electron microscopy. It is shown that the optical ceramic samples based on CaF2 have a lamellar structure, and the distance between lamellae is 25-50 nm. Most likely, lamellae have a twin nature. For BaF2 ceramic, lamellae are not typical, and they are concentrated near grain boundaries. © 2011 Pleiades Publishing, Ltd.


Gaponenko M.S.,Belarusian National Technical University | Gaponenko M.S.,University of Neuchatel | Tolstik N.A.,Belarusian National Technical University | Tolstik N.A.,Norwegian University of Science and Technology | And 3 more authors.
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2013

Following the long dominance of CdSe quantum dots as the paradigm semiconductor nanocrystals for investigating of strong quantum confinement phenomena, attention is paid to the lead chalcogenide quantum dots which possess a level of carrier confinement unachievable in quantum dots of other materials. However, the energy level structure of the lowest 1S-1S exciton in these quantum dots is not defined well. Here, we report on the experimental investigation of absorption and photoluminescence of PbS quantum dots with a mean radius of 2.4 nm and show that the 1S-1S absorption and photoluminescence band maxima obey different temperature dependences. The temperature decrease leads to the increase of the Stokes shift. The results are in qualitative agreement with the assumption that different inherent exciton states within the split 1S-1S exciton state are responsible for the absorption and emission of light by PbS quantum dots. © 2013 Published by Elsevier B.V.


Buganov O.V.,B. I. Stepanov Institute of Physics | Nguyen D.H.,Vietnam Academy of Science and Technology | Tikhomirov S.A.,B. I. Stepanov Institute of Physics | Onuschenko A.A.,Research and Technological Institute of Optical Materials Science
Advances in Natural Sciences: Nanoscience and Nanotechnology | Year: 2011

The parameters of a solid-state PbS quantum dot saturable absorber, optical elements, resonator and feedback circuit have been adjusted for stable and highly efficient hybrid mode-locking Nd :YAG laser operation. A highly stable microsecond pulse train (40-50μs) containing about 5000 ps pulses and 3 mJ total train energy was generated with a repetition rate of 10 Hz. This all solid-state hybrid mode-locked Nd :YAG laser was used for synchronous pumping of a femtosecond Ti : Sapphire laser. © 2011 Vietnam Academy of Science & Technology.


Gaponenko M.S.,Belarusian National Technical University | Kisel V.E.,Belarusian National Technical University | Kuleshov N.V.,Belarusian National Technical University | Malyarevich A.M.,Belarusian National Technical University | And 2 more authors.
Laser Physics Letters | Year: 2010

Passive mode locking of a continuous wave diodepumped Tm:KYW laser at 1.94 μm was demonstrated by using glass doped with PbS quantum dots as a saturable absorber. The laser operated in Q-switched mode-locking regime. Conversion efficiency of free-running output power to output power of pulsed operation was estimated at 30%. © 2010 by Astro Ltd.


Gaponenko M.S.,Belarusian National Technical University | Lutich A.A.,Ludwig Maximilians University of Munich | Tolstik N.A.,Belarusian National Technical University | Onushchenko A.A.,Research and Technological Institute of Optical Materials Science | And 3 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2010

We report experimental evidence of the lowest exciton state splitting and carrier trapping in PbS quantum dots (QDs) in glass matrix. Our measurements of photoluminescence (PL) of PbS QDs using steady-state and time-resolved PL spectroscopy reveal strong temperature dependences of the PL intensity and decay kinetics. We find that consistent quantitative description of our experimental results can be achieved using a simple model taking into account the lowest 1S-1S exciton state splitting and multiphonon-assisted carrier trapping to states outside a PbS QD. Using our model, we estimate the lowest exciton splitting energy and lifetimes of the dark and bright exciton states of PbS QDs. Consistent with our model, the PL transition energy of PbS QDs deviates at higher temperatures from the one predicted based on the bulk PbS band-gap dependence due to the lowest 1S-1S exciton state splitting. Temperature-induced broadening of the PL spectrum of PbS QDs is explained by the exciton-phonon interaction. © 2010 The American Physical Society.


Skoptsov N.A.,Belarusian National Technical University | Denisov I.A.,Belarusian National Technical University | Malyarevich A.M.,Belarusian National Technical University | Yumashev K.V.,Belarusian National Technical University | And 3 more authors.
Journal of Applied Spectroscopy | Year: 2011

Luminescence regularities have been studied in new erbium/ytterbium materials based on glasses and glass ceramics of a magnesium-aluminosilicate system containing nanoscale erbium/ytterbium zirconate titanate crystals with the pyrochlore structure. Lifetimes of Yb 3+ and Er 3+ ions in the 2 F 5/2 state and in the 4I 11/2 and 4I 13/2 states, respectively, and the efficiency of Yb 3+ → Er 3+ energy transfer have been evaluated. The identified spectral-luminescent characteristics of the studied glasses and glass ceramics co-doped with erbium and ytterbium ions show that these materials are promising media for producing laser generation in the spectral range around 1. 5 μm. © 2011 Springer Science+Business Media, Inc.


Alekseeva I.,Research and Technological Institute of Optical Materials Science | Dymshits O.,Research and Technological Institute of Optical Materials Science | Tsenter M.,Research and Technological Institute of Optical Materials Science | Zhilin A.,Research and Technological Institute of Optical Materials Science | And 5 more authors.
Journal of Non-Crystalline Solids | Year: 2010

Glass-ceramics are usually formed through passing several stages of phase transformations (nucleation, crystallization of metastable and stable crystalline phases). The properties of glass-ceramics depend on at what stage the process was stopped. The phase assemblage of glass-ceramics is controlled by the composition of the initial glass and heat-treatment conditions. Raman and optical spectroscopy, in combination with X-ray diffraction and small angle X-ray scattering techniques are used to study the behavior of the nucleation and crystallization of lithium, magnesium and zinc aluminosilicate glasses. Specific heat-treatments has given the opportunity to achieve a desired phase assemblage ensuring unique properties of glass-ceramics by interrupting the process at a certain stage. Examples of such glass-ceramic developments include thermal shock resistant color filters, passive Q-switchers for eye-safe Er:glass lasers, as well as transparent materials based on rare-earth titanates with pyrochlore structure with luminescence in the range of 1.5 μm. The approach to developing the dual active-passive media for the eye-safe spectral region is demonstrated for the first time. © 2010 Elsevier B.V. All rights reserved.


Gaponenko M.S.,Belarusian National Technical University | Buganov O.V.,B. I. Stepanov Institute of Physics | Onushchenko A.A.,Research and Technological Institute of Optical Materials Science | Hickey S.G.,TU Dresden | And 3 more authors.
Physica Status Solidi - Rapid Research Letters | Year: 2010

Exciton relaxation in PbS quantum dots (QDs) in glass and tetrachloroethylene have been investigated and the radiative and non-radiative relaxation rates of the lowest 1S-1S state have been measured. An estimate of the carrier intra-band transition rates and their transfer efficiency is calculated. The dependence of the exciton dynamics on the QD surface properties is presented and discussed. Lead sulfide (PbS) quantum dots with size of several nanometers provide tunable exciton transitions in the near-infrared spectral range and attract attention from both fundamental and applied points of view. The letter reports on the results of investigation of size- and matrix-dependent radiative and non-radiative relaxation of photoexcited excitons in these zero-dimensional semiconductor nanostructures. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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