Optical monocrystal

FIELD: physics.

SUBSTANCE: monocrystals are designed for infrared equipment and for making, by extrusion, single- and multi-mode infrared light guides for the spectral range from 2 mcm to 50 mcm, wherein a nanocrystalline structure of infrared light guides with grain size from 30 nm to 100 nm is formed, which determines their functional properties. The monocrystal is made from silver bromide and a solid solution of a bromide and iodide of univalent thallium (TIBr0.46I0.54), with the following ratio of components in wt %: silver bromide 99.5-65.0; solid solution TIBr0.46I0.54 0.5-35.0.

EFFECT: reproducibility and predictability of properties, avoiding cleavage effect, resistance to radioactive, ultraviolet, visible and infrared radiation.

 

The invention relates to single crystals, namely, optical materials, transparent windowless absorption from 0.4 to 50.0 μm.

The main properties of single crystals, designed, primarily, for the manufacture of them extrusion photonic crystal infrared (IR) fibers nanocrystalline structure having such properties as single mode operation and the advanced field of fashion, is the lack of cleavage in single crystals, radiation hardness (resistance to UV, visible and IR radiation), transparency (spectral transmittance) in the range from 0.4 to 50.0. In addition, for the manufacture of such fibers required single crystals with different refractive indices, i.e. variable chemical composition with reproducible and predictable properties.

Known optical single crystal on the basis of a solid solution of AgCl-AgBr, optionally containing two isovalent impurities: cationic monovalent thallium and anionic iodine. The crystal contains, in wt.%:

silver chloride - 18,0-22,0;

bromide of silver is 77.5-76,5;

iodide of silver is 0.5 to 1.5;

iodide monovalent thallium - 1,0-3,0.

[The patent for invention №2288489 of the Russian Federation. Optical single crystal. Zhukov L.V., Zhukov V.V., V.P. Pilyugin Appl. 13.05.2005; publ. 27.11.2006. Bull. No. 33]. But these crystals do not possess well the major chemical composition, i.e. the required refractive indices, which are necessary for newly created single-mode and with the advanced field of fashion IR fibers. In addition, the crystals of these compounds is less resistant to radiation, ultraviolet, visible and IR radiation than is required for practical application.

The closest technical solution is optical crystal, comprising a solid solution on the basis of bromide and silver iodide monovalent thallium, characterized in that it contains silver bromide, iodide monovalent thallium in the following ratio of ingredients, wt.%:

bromide silver99,5 to 90.0
iodide monovalent thallium0.5 to 10.0.

[The patent for invention №2413253 of the Russian Federation. Optical single crystal. Korsakov A.S., Grebneva A.A. Zhukova L.V., Chazov A.I., Bulatov NICHOLAS Appl. 24.02.2009; publ. 27.02.2011. Bull. No. 6]. But the single crystals of the specified chemical composition is also unable to obtain a stable with reproducible properties, namely high resistance to ultraviolet, visible, infrared and radiation radiation and the desired refractive index. In addition, single crystals are transparent only to 45 microns.

Task invented the I is the creation of single crystals of optimum chemical composition on the basis of bromide of silver in solid solution TlBr 0.46I0.54with reproducible stable and predictable properties, not with the effect of cleavage. The crystals have a refractive index from 2,209 up to 2,305 on the length of the radiation of CO2laser (λ=10.6 μm) and transparent in the spectral range from 0.4 to 50.0 μm, and compared with the prototype resistant from 5 to 10 times, depending on the chemical composition, radiation, ultraviolet, visible and infrared radiation.

The problem is solved due to the fact that optical single crystal on the basis of bromide of silver further comprises a solid solution of bromide and iodide monovalent thallium (TlBr0.46I0.54) in the following ratio of components, wt.%:

bromide silver99,5-65,0;
solid solution TlBr0.46I0.54-0,5-35,0.

New crystals have the following advantages:

1. Using special technology, the crystals are made of the optimum chemical compositions, therefore, they are reproducible and asked (projected) functional properties.

2. The refractive index of the crystals depending on the chemical composition has a value from 2,209 up to 2,305 for operation at a wavelength of 1.6 ám, compared with the prototype from 2,203 to 2.24.

3. Raised in relation to the prototype sustainability 5-10 times to radiation, ultraviolet, visible and infrared radiation, depending on the composition of the crystal, i.e. the optical properties of single crystals do not change with the passage of electromagnetic radiation.

4. Extended range of transparency in the far infrared region of the spectrum up to 50 μm (in the prototype to 45 μm).

The essence of the invention lies in the fact that you created a new optical single crystal on the basis of AgBr with cubic modification, and solid solution of bromide and iodide monovalent thallium (TlBr0.46I0.54), which also has a cubic modification. In this regard, it is possible to enter solid solution TlBr0.46I0.54up to 35 wt.% in the crystal lattice AgBr, against, as in the prototype, only up to 10 wt.% iodide monovalent thallium, because TlI has orthorhombic modification. Due to the presence in the crystal of radiation-resistant and heavy molecular weight of solid solutions on the basis of the halides of monovalent thallium (TlBr0.46I0.54) increases the resistance to ultraviolet, visible, infrared and radiation radiation that extends in the long wavelength range of transparent crystals up to 50 microns, increases their refractive index to 2,305 (see example 1). Developed mono is rectally designed for operation in the spectral range from 0.4 to 50.0 μm.

With decreasing content of solid solution on the basis of the halides of monovalent thallium bromide in silver less than 0.5% by weight (see example 4) is limited to the range of transparency, low refractive index, additionally, the crystal becomes less resistant to ultraviolet, visible and infrared radiation. In the case of increasing the content of solid solution (TlBr0.46I0.54in the bromide of silver more than 40% by weight (see example 5) crystal grows block and splits the block boundaries.

Example 1.

've grown single crystal by Bridgman method with axial vibration of the melt. It contains, in wt.%:

bromide silver65,0;
solid solution TlBr0.46I0.54-35,0.

The crystal is optically processed and measured the refractive index, which had a value 2,305 at a wavelength of 10.6 µm. It is transparent from the visible to the far IR region of the spectrum, i.e. from 0.4 to 50.0 μm. Optical properties of single crystal does not change when passing through the ultraviolet, visible, PC and radiation radiation power ten times greater compared to the prototype.

Example 2.

've grown single crystal of composition in wt.%

bromide silver99,5;
solid solution TlBr0.46I0.54-0,5.

The crystal is optically processed and measured the following characteristics:

1. Refractive index: 2,209.

2. Spectral transmittance: from 0.4 to 50.0 μm.

Optical properties of single crystal does not change under the action specified in example 1 radiation power, 5 times greater compared to the prototype.

Example 3.

've grown single crystal of composition in wt.%:

bromide silver80,0;
solid solution TlBr0.46I0.54-20,0.

The measured optical characteristics specified in example 1:

1. Refractive index: 2,255.

2. Spectral transmittance: from 0.4 to 50.0 μm.

Under the action of visible, ultraviolet, infrared and radiation radiation power, 7 times greater compared to the prototype, the optical properties of the single crystal is not changed.

Example 4.

By the Bridgman method with axial vibration of the melt grown single crystal containing in wt.%:

bromide silver99,8;
solid solution TlBr0.46I0.54-0,2.

The crystal is optically processed and measured: the refractive index was 2,03; the range of transparency from 0.4 to 35.0 μm. Crystal resistant to infrared radiation, but under the action of ultraviolet, visible and radiation radiation decomposes with evolution of silver oxide and compounds of silver.

Example 5.

By the Bridgman method has grown monocrystal containing in wt.%:

bromide silver60,0;
solid solution TlBr0.46I0.54-40,0.

Crystal grew up a block and splits the block boundaries.

The technical result allows to obtain optical single crystals on the basis of bromide of silver and solid solutions (TlBr0.46I0.54a specific composition having a refractive index from 2,209 up to 2,305. The crystals are transparent from the visible to the far PC-spectral range (from 0.4 to 50.0 μm). They are required to obtain extrusion photonic crystal infrared optical fibers (single-mode and with an expanded diameter of the field of fashion) for the spectral range is Altanbulag from 2 to 50 μm, thus forming the nanocrystalline structure of the infrared optical fibers with a grain size of 30 to 100 nm, which determines their functional properties.

Optical crystal, comprising as the basis bromide silver, characterized in that it additionally contains a solid solution of bromide - iodide monovalent thallium (TlBr0.46I0.54) in the following ratio, wt.%:

bromide silver99,5-65,0
solid solution (TlBr0.46I0.54)0,5-35,0



 

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