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Strontium metaborate birefringent crystal, preparation method and use

A technology of birefringent crystals and metaboric acid, applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve problems such as difficult high-quality crystals, cracking, etc.

Active Publication Date: 2020-08-04
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although Kim et al. used the pulling method to grow the crystal, the experiment showed that the crystal has a large thermal anisotropy, so it is easy to generate large thermal stress during the growth process of the pulling method, which will cause the crystal to grow or It is easy to crack along a specific direction during processing. Jeong-Bae Kim et al. mentioned the cracking during the growth process in the paper (refer to the literature: Materials Letters, 31(1997), 93-97), so the growth is biased by the pulling method. Strontium borate crystals are difficult to obtain high-quality crystals that meet the needs of device manufacturing

Method used

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  • Strontium metaborate birefringent crystal, preparation method and use
  • Strontium metaborate birefringent crystal, preparation method and use
  • Strontium metaborate birefringent crystal, preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Growth of birefringent crystals of strontium metaborate by melt bubble method:

[0059] According to the chemical formula: SrO+2H 3 BO 3 →SrB 2 O 4 +H 2 O↑ Preparation of birefringent crystals of strontium metaborate, raw materials SrO and H used 3 BO 3 For analytically pure (≥99%):

[0060] Directly mix SrO and H 3 BO 3 According to the molar ratio of strontium:boron=1:2, the mixture is uniformly mixed and fully ground into a platinum crucible, and the temperature is slowly raised to a temperature of 1180 ° C and kept at a constant temperature for 24 hours to obtain a mixed melt;

[0061]Preparation of strontium metaborate seed crystals: the obtained mixed melt was rapidly cooled by 5 °C, kept at the corresponding temperature for 2 hours, and the process of cooling and heat preservation was repeated until the liquid surface of the mixed melt appeared. Slowly cool down to room temperature at a cooling rate of 20°C / h after the crystallization is completed, and s...

Embodiment 2

[0065] Growth of birefringent crystals of strontium metaborate by melt bubble method:

[0066] The analytically pure (≥99%) strontium metaborate compound is directly weighed and loaded into a platinum crucible, slowly heated to a temperature of 1160 °C, and kept at a constant temperature for 15 hours to obtain a mixed melt;

[0067] Preparation of strontium metaborate seed crystal: drop the platinum wire fixed at the lower end of the seed rod into the obtained mixed melt, slowly cool down at a rate of 5°C / h until crystals appear on the platinum wire, and then rotate at a rate of 5r / min Rotate the seed rod and slowly cool down at a rate of 2°C / d. After the crystal grows to the desired size, lift it out of the liquid surface and drop it to room temperature at a cooling rate of 20°C / h to obtain a strontium metaborate seed crystal;

[0068] Put the crucible containing the obtained mixed melt into the crystal growth furnace, fix the obtained seed crystal on the seed rod, cool down ...

Embodiment 3

[0070] Growth of birefringent crystals of strontium metaborate by melt bubble method:

[0071] By chemical formula: SrCO 3 +2H 3 BO 3 →SrB 2 O 4 +CO 2 ↑+H 2 O↑ Preparation of strontium metaborate birefringent crystal, the raw material SrCO used 3 and H 3 BO 3 It is analytically pure (≥99%);

[0072] SrCO 3 and H 3 BO 3 According to the molar ratio of strontium:boron=1:2, mix evenly and fully grind, then put it in a corundum crucible and pre-fire at 300°C for 4 hours, take out and grind and compact, then the temperature is raised to 1000°C and kept for 3 days to obtain strontium metaborate The polycrystalline powder of the compound is subjected to X-ray analysis, and the obtained X-ray spectrum is consistent with the X-ray spectrum after grinding the strontium metaborate single crystal into powder;

[0073] The synthesized strontium metaborate polycrystalline powder is put into a platinum crucible, heated to a temperature of 1160 ° C, and kept at a constant tempera...

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Abstract

The invention relates to a strontium metaborate birefringent crystal as well as a preparation method and an application. The crystal has the chemical formula of SrB2O4 and the molecular weight of 173.24, belongs to the orthorhombic crystal system, has the space group of Pbcn and cell parameters as follows: a is equal to 12.00(5) angstrom, b is equal to 4.33(7) angstrom, c is equal to 6.58(4) angstrom and Z is equal to 4. The crystal grows with a melt method, a flux method, a crucible descending method or a heat exchange method. The strontium metaborate birefringent crystal is a negative biaxial crystal with the permeating range of 170-3,300 nm and the birefringence between 0.10 and 0.35. The crystal can be applied to infrared-visible-ultraviolet-deep ultraviolet bands, can be used for producing polarizing beam splitter prisms such as Glan prisms and Wollaston prisms and optical components such as optoisolators and light beam displacers and has important applications in optics, laser photolithography and optical communication.

Description

technical field [0001] The invention relates to a molecular formula of SrB for infrared-visible-deep-ultraviolet-deep-ultraviolet band. 2 O 4 The preparation method and application of the strontium metaborate birefringent crystal belong to the technical field of crystal materials and the field of optical technology. Background technique [0002] With the continuous expansion of the breadth and depth of laser applications and the rapid development of optical communication technology, birefringent crystals have become an indispensable material for modulating the polarization state of light. At present, birefringent crystals are the key materials for making polarizing beam splitting prisms such as Glan prisms and Wollaston prisms, as well as optical communication components such as optical isolators, beam shifters, and circulators. Usually practical birefringent crystals require as large a birefringence as possible in the working wavelength band. [0003] Commonly used biref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B9/12C30B11/00C30B15/00
CPCC30B9/12C30B11/00C30B15/00C30B29/22
Inventor 潘世烈陈幸龙张方方
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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