Spectroscopic properties of CaBaBO3F (CBFB) and Ca4Y(BO3)3O (YCOB) crystals with Yb3+ and Er3+ ions

Лебедев, В. А.; Ворошилов, Ю. В.; Ignatiev, B.V.; Гавриленко, А. Н.; Pisarenko, V. F.; Saakyan, A. V.

doi:10.1364/assl.2000.mb6

Cited by 2 publications

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“…BaCaBO 3 F is an interesting material with important nonlinear optical properties. Doped with rare-earth elements it was reported to be a new laser crystal with potential for self-frequency doubling. − Pure BaCaBO 3 F was first obtained by Keszler et al described as a congruent melting compound crystallizing in the hexagonal space group P –62 m with a = 9.049(1) Å and c = 4.326(1) Å. Crystals up to several centimeters could be grown by the Czochralski ,,− and Kyropoulos , pulling methods. The basic features of the hexagonal crystal structure were described by Keszler et al in 1994 without publishing the atomic parameters.…”

Section: Introductionmentioning

confidence: 99%

Crystal Growth, Crystal Structure, Optical Properties, and Phase Transition of BaCaBO₃F

Burianek

Teck

Niekamp

et al. 2016

Crystal Growth & Design

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A crystal of BaCaBO3F was grown by the Czochralski method. It shows a phase transition at 242.7 °C upon cooling where the hexagonal high-temperature modification is transformed to a monoclinic low-temperature form (space group C2, a = 17.8779(8) Å, b = 9.0596(4) Å, c = 12.9735(5) Å, β = 118.875(13)°, V = 1840.03(22) Å3, Z = 18). The monoclinic phase has a symmetry lowered by an index of 18 relative to the hexagonal supergroup. This represents a higher symmetry than the rhombohedral model which has a symmetry of index 36 lower than the hexagonal form determined in a previous study (Li and Zeng, J. Cryst. Growth 2013, 382, 47). The monoclinic system is confirmed by optical investigations with a polarizing microscope showing biaxial negative character and refractive indices nx = 1.615(1), ny = 1.664(1), and nz = 1.665(1), 2Vx = 10.0(2)° as measured on a microrefractometer spindle stage in immersion liquids. Electron microprobe analysis yielded a slight excess of Ba resulting in the composition Ba1.04Ca0.96BO3F corresponding to [7]Ba4.7[8]Ba6[9]Ba4[10]Ba4[7]Ca17.3[3]B18O54F18 in a crystal-chemical notation for the unit-cell content with the cations in their respective coordination. On the basis of this composition, the mean refractive index can be calculated from individual electronic polarizabilities of the ions resulting in = 1.638 which is close to the observed value of within an error of 0.5%

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Section: Introductionmentioning

confidence: 99%

Crystal Growth, Crystal Structure, Optical Properties, and Phase Transition of BaCaBO₃F

Burianek

Teck

Niekamp

et al. 2016

Crystal Growth & Design

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“…Furthermore, a number of crystal media on the base of borate crystals with a developed phonon spectrum have been proposed [4,5]. They lack the reverse energy transfer, fast multiphonon nonradiative relaxation shunts the 4 I 11/2 -4 I 13/2 Er 3+ transfer.…”

Section: Introductionmentioning

confidence: 99%

“…It has been determined recently that erbium ions in crystals CBFB have outstanding spectroscopic parameters, besides, between ytterbium and erbium ions fast energy transfer of electronic excitation takes place [7]. Since the efficiency of a sensitized laser medium depends on joint characteristics of the Yb and Er centres and the efficiency of their interactions, then available data allow considering crystals CBFB as a considerably promising matrix for an effective 1.5 µm laser.…”

Section: Introductionmentioning

confidence: 99%

“…Just the same, the absorption cross sections at the wavelength in CBFB (in one of polarizations) are more than 5 times superior to the phosphate glasses. The quantum output of the energy transfer in CBFB is high and at low excitation levels approaches 100% [7,13]. As the excitation level increases, the rate of the energy transfer decreases, but because the parameter β min in CBFB is low (ref.…”

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A Comparative Analysis of Ytterbium-Erbium Media for 1.5 μm Lasers

Galutskiy

Stroganova

Yakovenko

2013

AMR

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To increase efficiency of continuous 1.5 μm laser radiation crystal laser media should be used instead of the glass ones. Generation efficiency in major laser crystals with ytterbium and erbium is at a disadvantage in relation to phosphate glasses. A cause of this phenomenon is a reverse energy transfer. Could be found crystals comparable in efficiency with Yb-Er phosphate glasses? At present a number of investigations on the use of ions relaxators Се 3+ in crystals Ca2Al2Si07 with ytterbium and erbium have been carried out to solve the problem of the reverse energy transfer in crystals [1,2]. It has been determined [1-3] that high content of cerium is needed to depress the reverse energy transfer. But cerium and ytterbium are in different ends of a lanthanide series, so silicate crystals with more isomorphic capacity such as Yb,Er,Ce:CaGdSiO (CGCS) have been proposed [3]. A sufficient solubility of Се 3+ ions in these crystals gives fast excitation relaxation on a laser level and guards against the reverse energy transfer from Er3+ to donor ions. Furthermore, a number of crystal media on the base of borate crystals with a developed phonon spectrum have been proposed [4,5]. They lack the reverse energy transfer, fast multiphonon nonradiative relaxation shunts the 4I11/2 – 4I13/2 Er3+ transfer. New crystals on the base of anhydrous borates – calcium-yttrium oxyorthoborates - Ca4YO(BO3)3 (YCOB) with ytterbium appeared recently [6], which showed high efficiency of generation, as well as calcium-barium fluor-orthoborates YbEr:Ca BaFBO3 (CBFB), in which ytterbium ions formed centers of luminescence with excellent characteristics [6]. Unfortunately, erbium ions in YCOB are characterized by high three level parameter [6], therefore the efficiency of generation Er,Yb:YCOB is not high. It has been determined recently that erbium ions in crystals CBFB have outstanding spectroscopic parameters, besides, between ytterbium and erbium ions fast energy transfer of electronic excitation takes place [7]. Since the efficiency of a sensitized laser medium depends on joint characteristics of the Yb and Er centres and the efficiency of their interactions, then available data allow considering crystals CBFB as a considerably promising matrix for an effective 1.5 μm laser. In order to obtain the most promising laser crystals and to answer the question cited above, it should be made their comparative analysis on basic spectroscopic and generative parameters. One of the important parameters related directly to the efficiency of the laser medium is an energy density of the generation threshold. Given spectroscopic parameters of active centers in crystals, the generation threshold of the one-activated laser medium (in an idealized model without passive losses) with a tree-level or quasi-four-level scheme of generation is specified by properties of active centers and can be easily determined by a simple formula [8]. The results obtained by this method are often used for determination of limiting parameters of the three-level laser media, the ytterbium media, for instance, and their comparative analysis [8]. There are known calculations of sensitized media generation parameters, among them the ytterbium-erbium glasses with a tube pumping [9], which although can be used for a diode pumping, nonetheless they are too unwieldy for simple estimation and comparative analysis. Hence there is a demand for simple analytical expressions such as [8] to calculate the lower limit of generation of the sensitized two-activated laser media with a diode pumping. The work reports the growing of single crystals CBFB and YCOB doped with erbium and ytterbium with erbium, and single crystals Yb,Er,Ce:CGS as well. We have made a comparative analysis of an ytterbium-erbium media for 1.5 μm lasers with a diode pumping on the base of simple expressions for limiting generation thresholds of the idealized sensitized media with a three-level scheme of generation, obtained in the approximation of balance equations without considering nonlinear and cumulative processes.

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Spectroscopic properties of CaBaBO3F (CBFB) and Ca4Y(BO3)3O (YCOB) crystals with Yb3+ and Er3+ ions

Cited by 2 publications

References 1 publication

Crystal Growth, Crystal Structure, Optical Properties, and Phase Transition of BaCaBO₃F

Crystal Growth, Crystal Structure, Optical Properties, and Phase Transition of BaCaBO₃F

A Comparative Analysis of Ytterbium-Erbium Media for 1.5 μm Lasers

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Spectroscopic properties of CaBaBO3F (CBFB) and Ca4Y(BO3)3O (YCOB) crystals with Yb3+ and Er3+ ions

Cited by 2 publications

References 1 publication

Crystal Growth, Crystal Structure, Optical Properties, and Phase Transition of BaCaBO3F

Crystal Growth, Crystal Structure, Optical Properties, and Phase Transition of BaCaBO3F

A Comparative Analysis of Ytterbium-Erbium Media for 1.5 μm Lasers

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Product

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Crystal Growth, Crystal Structure, Optical Properties, and Phase Transition of BaCaBO₃F

Crystal Growth, Crystal Structure, Optical Properties, and Phase Transition of BaCaBO₃F