INCROM Ltd.

Saint Petersburg, Russia

INCROM Ltd.

Saint Petersburg, Russia
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Ashurov M.K.,Fonon State Research and Production Company | Boibobeva S.T.,Academy of Sciences of Uzbekistan | Nuritdinov I.,Academy of Sciences of Uzbekistan | Garibin E.A.,INCROM Ltd. | And 3 more authors.
Inorganic Materials | Year: 2016

We have studied the radiation resistance of CaF2:Yb3+ (3 mol % YbF3) laser ceramics and a single crystal of similar composition (3.6 mol % YbF3) exposed to gamma rays in a 60Co source. The unirradiated samples have been shown to be similar in spectral characteristics. Even though irradiation leads to identical valence changes, Yb3+↔Yb2+, in the single crystals and ceramics, it produces characteristic defect centers in the ceramic samples, which are responsible for the observed marked differences in the rate of valence changes and the annealing rate of radiation-induced defects. © 2016, Pleiades Publishing, Ltd.


Akchurin M.S.,Russian Academy of Sciences | Basiev T.T.,RAS A.M. Prokhorov General Physics Institute | Demidenko A.A.,INCROM Ltd | Doroshenko M.E.,RAS A.M. Prokhorov General Physics Institute | And 8 more authors.
Optical Materials | Year: 2013

CaF2:Yb fluoride laser ceramics, prepared by hot-forming, exhibit the same optical properties as starting single crystals. Slope efficiency of the Ca0.95Yb0.05F2.05 is equal to 35% in the pulsed mode of laser operation. Decrease of ytterbium concentration in CaF2:Yb samples down to 3 mol.% resulted in the essential improvement of Ca0.97Yb0.03F2.03 thermal conductivity from 3.5 to 4.5 W/m K, but slightly decreased (down to 30%) slope efficiency of the samples under both pulsed and CW mode of operation. Alternative hot-pressing synthesis of CaF2:Yb fluoride laser ceramics provided materials with superior mechanical properties (microhardness H = 3.2 GPa and fracture toughness K1C = 0.65 K1c m1/2) in comparison with hot-formed and/or single crystal CaF2:Yb specimens. For the first time, lasing has been observed for the novel aforementioned hot-pressed CaF2:Yb ceramics. © 2012 Elsevier B.V. All rights reserved.


Bol'fshchikov F.A.,Np Ogarev Mordovian State University | Garibin E.A.,INCROM Ltd. | Gusev P.E.,INCROM Ltd. | Demidenko A.A.,INCROM Ltd. | And 11 more authors.
Quantum Electronics | Year: 2011

Tm : CaF2 (4 mol % TmF3) single crystals and ceramic samples have been prepared, the microstructure of the ceramic has been examined by SEM and AFM, and the luminescent properties of the crystals and ceramic have been analysed. © 2011 Kvantovaya Elektronika and Turpion Ltd.


Popov P.A.,Bryansk State University | Fedorov P.P.,RAS A.M. Prokhorov General Physics Institute | Garibin E.A.,INCROM Ltd. | Smirnov A.N.,INCROM Ltd. | And 2 more authors.
Inorganic Materials | Year: 2012

The thermal conductivity of Ca 1 - xHo xF 2 + x (x ≤ 0.03) optical ceramics has been studied experi mentally in the temperature range 50-300 K. With increasing holmium content, the thermal conductivity of the ceramics decreases, especially at low temperatures: from 10.2 to 2.3 W/(m K) at 300 K and from 250 to 4.5 W/(m K) at 50 K. © Pleiades Publishing, Ltd., 2012.


Fedorov P.P.,RAS A.M. Prokhorov General Physics Institute | Osiko V.V.,RAS A.M. Prokhorov General Physics Institute | Kuznetsov S.V.,RAS A.M. Prokhorov General Physics Institute | Garibin E.A.,INCROM Ltd.
Journal of Physics: Conference Series | Year: 2012

Because of the recent technology progress in the synthesis of fluoride ceramics by so-called hot-pressing method, several cooperating research groups have produced and meticulously described various polycrystalline ceramic samples with optical characteristics similar to the properties of corresponding single crystals. Their achievements made fluoride optical materials less expensive, more diverse and easier available for the use in solid-state lasers. The present review covers studies of fluoride ceramic materials and their properties in the last fifty years. It describes the most significant results obtained by leading scientific groups and indicates the most promising directions where research of fluoride laser ceramics should proceed in near future.


Moiseev N.V.,Bryansk State University | Popov P.A.,Bryansk State University | Fedorov P.P.,RAS A.M. Prokhorov General Physics Institute | Garibin E.A.,INCROM Ltd. | Reiterov V.M.,INCROM Ltd.
Inorganic Materials | Year: 2013

The heat capacity of single crystals of the Ca1-x Er x F2+x (x = 0.05, 0.10) and Ca0.95Yb 0.05F2.05 fluorite solid solutions was determined by adiabatic calorimetry in the temperature range 55-300 K. The results were used to obtain temperature dependences of the Debye characteristic temperature, entropy, and enthalpy for the solid solutions. © 2013 Pleiades Publishing, Ltd.


Lyapin A.A.,Ogarev Mordovian State University | Fedorov P.P.,RAS A.M. Prokhorov General Physics Institute | Garibin E.A.,INCROM Ltd. | Malov A.V.,Ogarev Mordovian State University | And 3 more authors.
Optical Materials | Year: 2013

The laser quality transparent CaF2:Tm fluoride ceramics has been prepared by hot forming. Comparative study of absorption and emission spectra of CaF2:Tm (4 mol.% TmF3) ceramic and single crystal samples demonstrated that these materials possess almost identical spectroscopic properties. Laser oscillations of CaF2:Tm ceramics were obtained at 1898 nm under diode pumping, with the slope efficiency of 5.5%. Also, the continuous-wave (CW) laser have been obtained for CaF2:Tm single crystal at 1890 nm pumped by a diode laser was demonstrated. © 2013 Elsevier B.V. All rights reserved.


Doroshenko M.E.,RAS A.M. Prokhorov General Physics Institute | Demidenko A.A.,INCROM Ltd. | Fedorov P.P.,RAS A.M. Prokhorov General Physics Institute | Garibin E.A.,INCROM Ltd. | And 8 more authors.
Physica Status Solidi (C) Current Topics in Solid State Physics | Year: 2013

A variety of Er3+-, Tm3+-, and Yb3+-activated CaF2-, SrF2-, (Ca, Sr)F2- and (Sr, Ba)F2-based fluoride laser ceramics have been prepared by the hot-forming technique. Lasing of the SrF2:Yb3+, (Ca, Sr)F2:Er3+, (Ca, Sr)F2:Tm3+, (Ba, Sr)F2:Tm3+ and (Ba, Sr)F2:Yb3+ specimens with diode pumping has been observed for the first time. Thermal conductivity data for the above fluorite-type laser materials are also presented and discussed. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Shcheulin A.S.,National Research University of Information Technologies | Angervaks A.E.,National Research University of Information Technologies | Semenova T.S.,National Research University of Information Technologies | Koryakina L.F.,National Research University of Information Technologies | And 5 more authors.
Applied Physics B: Lasers and Optics | Year: 2013

When growing CaF2 crystal doped with rare-earth ions, most of these ions are present in a trivalent state. However, due to contact with graphite crucible, a small proportion of a number of ions (Eu, Sm, Yb and Tm) are reduced to a bivalent state. A similar situation takes place during fabrication of CaF2 ceramics doped with rare-earth metals. This fact is of particular importance for laser CaF2:Yb crystals (ceramics), a promising material for short-pulse, high-power, high-energy diode-pumped solid state lasers since the presence of bivalent Yb ions can be a source of thermal losses. To date, there has been no technique to determine Yb2+ concentration in as-grown crystals. The proposed technique is based on a total reduction of Yb3+ ions via the heating of as-grown CaF2 crystals with known concentration of Yb in the reducing atmosphere of metal vapour and determining the cross section of absorption bands of Yb2+ ions. The knowledge of these parameters allows estimation of the Yb2+ content in CaF2:Yb crystals or ceramics by analysing their absorption spectra. Examples of using this technique are given. The technology of CdF2 crystals reduction (an "additive colouring") and features of colouring of crystals doped with rare-earth ions are considered. © 2013 Springer-Verlag Berlin Heidelberg.


Bikhert Y.V.,L.N.Gumilyov Eurasian National University | Lisitsyn V.M.,Tomsk Polytechnic University | Lisitsyna L.A.,Tomsk State University of Architecture and Building | Korepanov V.I.,Tomsk Polytechnic University | And 2 more authors.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2014

Here, we study pulsed cathodoluminescence of "pure" and Nd 3+ doped YLiF4 crystals. Luminescence spectrum covers two short-lived bands with maxima at 4.3 and 3.2 eV and a halfwidth of 0.9 eV each. Irradiated at 15 K, "pure" and Nd3+ doped crystals of YLiF4 have induced color centers that provide for the absorption band reaching maxima of 2.1 and 3.7 eV in the main bands. © 2014 Elsevier B.V. All rights reserved.

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