Strontium metaborate birefringent crystal as well as preparation method and application

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

Active Publication Date: 2018-08-21
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 (see 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 as well as preparation method and application
  • Strontium metaborate birefringent crystal as well as preparation method and application
  • Strontium metaborate birefringent crystal as well as preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Melt Kyropoulos growth of strontium metaborate birefringent crystals:

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

[0060] directly combine SrO and H 3 BO 3 According to the molar ratio of strontium: boron = 1:2, mix evenly and fully grind it, put it into a platinum crucible, slowly heat up to a temperature of 1180°C, and keep the temperature at a constant temperature for 24 hours to obtain a mixed melt;

[0061]Preparation of strontium metaborate seed crystals: quickly cool down the obtained mixed melt by 5°C, keep it at the corresponding temperature for 2 hours, repeat the process of cooling and heat preservation until the liquid level of the mixed melt appears floating crystals, and then use 0.5°C / d Slowly lower the temperature until the crystallization is complete, then lower the temperature to ro...

Embodiment 2

[0065] Melt Kyropoulos growth of strontium metaborate birefringent crystals:

[0066] Directly weigh the analytically pure (≥99%) strontium metaborate compound into a platinum crucible, slowly raise the temperature to 1160°C, and keep the temperature constant for 15 hours to obtain a mixed melt;

[0067] Preparation of strontium metaborate seed crystal: lower 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 speed of 5r / min Rotate the seed crystal 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 strontium metaborate seed crystals;

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

Embodiment 3

[0070] Melt Kyropoulos growth of strontium metaborate birefringent crystals:

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

[0072] SrCO 3 and H 3 BO 3 According to the molar ratio of strontium: boron = 1:2, mix well and grind thoroughly, then put it into a corundum crucible and pre-fire it at 300°C for 4 hours, take it out, grind it and compact it, then raise the temperature to 1000°C, and keep it warm 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 the strontium metaborate single crystal is ground into powder;

[0073] Put the synthesized strontium metaborate polycrystalline powder into a platinum crucible, heat to a temperature of 1160°C, and keep the temperature constant fo...

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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 present invention relates to a kind of molecular formula for infrared-visible-deep ultraviolet-deep ultraviolet band is SrB 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 polarization 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 that they have as large a birefringence as possible in the working band. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(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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