TeO2 single crystals for Acousto-optics and Optoelectronics
Company "Elent A/Elent Technics" has more than 20 years
experience in the growth of acousto-optic and optoelectronic
crystals.
Company has its own production and technical capabilities to
growth and working (grinding, orientation, polishing, coating
etc.) of Paratellurite Single Crystals (ТеО2).
Based on the engineering know-how and a lot of researches and
experiments we offer our customers all over the world high
quality products manufactured according to the specific
requirements.
We offer quality and stability!
Our own production facilities take total area of 2000 m2
where chemical, growth and optical labs are placed. Our
labs are equipped with all necessary production and
inspection equipment.
Chemical Lab is engaged in mixture preparing for the ТеО2 crystals growth. Cleaning process
includes developed by our specialists unique method of physicochemical mixture cleaning. Such
cleaning allow us to get qualitative mixture with purity 6N for the crystals growth according to
the various demands of our customers.
Growth Lab is equipped with growth station of own design for crystals growth by Czochralski
method. Single crystals growth process is completely automated.
Optical Lab is equipped with all necessary equipment to carry out crystallographic orientation,
cutting, grinding, polishing and optical coating. Orientation accuracy is 1', grinded surface
parallelism up to 1mkm, polished surface parallelism up to 10 - 15 '', angle between polished
surfaces up to 3'', polishing accuracy λ/10.
ТеО2 (paratellurite, tellurium dioxide) single crystals
Main properties
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Colorless synthetic single crystal
Symmetry: Tetragonal, 422 (D4)
Lattice distances: a = 4.8122 Å; c = 7.6157 Å
Molecular weight: 159.5
Density, g/cm3: 5.99 ± 0.03
Melting point: 733 ˚С
Hardness: 3 – 4 Moh’s hardness scale
Thermal expansion, ·10-6 К-1: α11 = 17.7; α22 = 17.7; α33 = 5.5
Transmission: 0.35 – 5.0 μm
ТеО2 (paratellurite, tellurium dioxide) single crystals
Characteristics
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we manufacture ourselves base mixture for single crystals growth with purity
99,9995% of main material and up;
boules' diameter up to 90 mm, high up to 50 mm, high optical homogeneity in
big material volume;
single crystals are transparent and visually colorless, have no absorption
bands in visible and IR spectral regions;
are free from striaes, cracks, visible bubbles and their clusters, other foreign
inclusions;
very low scattering of optical radiation.
Some results of TeO2 samples testing on
radiation resistance
Test for sample Nr1. was carry out at: 1.064 mkm
 Pulse duration: 12 ns
 Repetition frequency: 1 Hz
 Spot diameter on the surface: 4 - 6 mm
 Fist damages appeared at power density 2 x 108 W/cm2
Test for sample Nr2. was carry out at: 0.355 mkm
 Pulse duration: 10 ns
 Repetition frequency: 10 Hz
 Spot diameter on the surface: 5 mm
 Fist damages appeared at power density 2 x 108 W/cm2
 Breakdown on A and B surfaces occurred at power density 2.5 x 107 W/cm2
Crystals’ transmission spectrum in
visible and IR ranges
Sample 1 - TeO2 crystal grown specially for 355 – 405nm
Sample 2 - Standard TeO2 crystal grown for visible and NIR ranges
Crystals’ transmission spectrum in IR range
2,5 – 4,5 mkm
TeO2 crystal grown under special technology
minimizing absorption on crystallized water
in the range 2,7 – 3,2 mkm
Standard TeO2 crystal IR range
(may contain absorption regions)
TeO2 crystals application
TeO2 single crystals are perfect material for acousto-optic devices like
Modulators, Deflectors, Tunable Filters, Spectral Analyzers and many
other acousto- and optoelectronic devices.
We are always open for cooperation and collaboration with our present
and future customers and partners !
Sincerely yours
“Elent A / Elent Technics” Team
Gogol Str. 15,
Dnepropetrovsk, 49044
Ukraine
Tel./Fax + 380-56-7901235, 7901236, 7901237
info@elent-a.net
www.elent-a.net