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Calcium metaborate birefraction crystal as well as preparation method and purpose thereof

A technology of birefringent crystals and calcium metaborate, applied in crystal growth, chemical instruments and methods, boron compounds, etc., can solve problems such as single crystals that cannot meet the requirements of devices

Active Publication Date: 2018-07-20
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

The crystal materials usually used to make optical devices need to be bulk single crystals and have a large size, and the method reported in the literature obviously cannot obtain a single crystal that meets the required size of the device.
The preparation of large-sized bulk single crystals of this crystal, the birefringence properties of this crystal, and its use as a birefringent crystal have not been reported yet.

Method used

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  • Calcium metaborate birefraction crystal as well as preparation method and purpose thereof
  • Calcium metaborate birefraction crystal as well as preparation method and purpose thereof
  • Calcium metaborate birefraction crystal as well as preparation method and purpose thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Growth of calcium metaborate birefringent crystals by melt pulling method:

[0069] According to the chemical formula: CaO+2H 3 BO 3 →CaB 2 o 4 +H 2 O ↑ preparation of calcium metaborate birefringent crystals, raw materials CaO and H 3 BO 3 For analytical pure (≥99%):

[0070] direct CaO and H 3 BO 3 According to the molar ratio of calcium: boron = 1:2, mix evenly and fully grind it, put it into a platinum crucible, slowly raise the temperature to 1180°C, and keep the temperature at a constant temperature for 24 hours to obtain a mixed melt;

[0071] Preparation of calcium metaborate seed crystals: quickly cool down the obtained mixed melt by 5°C, keep it at 1175°C for 2 hours, repeat the process of cooling and heat preservation until the surface of the mixed melt floats, and then use 0.1°C / d Slowly lower the temperature until the crystallization is complete, then lower the temperature to room temperature at a cooling rate of 20°C / h, and spontaneously crystalli...

Embodiment 2

[0075] Growth of calcium metaborate birefringent crystals by melt pulling method:

[0076] Weigh the analytically pure (≥99%) calcium metaborate compound directly into a platinum crucible, slowly raise the temperature to 1170°C, and keep the temperature constant for 10 hours to obtain a mixed melt;

[0077] Preparation of calcium 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 rod, slowly cool down at a rate of 2°C / d, and at the same time pull up the crystal at a speed of 1mm / h, lift it out of the liquid surface after the crystal grows to the desired size, and cool down at a rate of 20°C / h Rate is down to room temperature, obtains calcium metaborate seed crystal;

[0078] Put the crucible containing the prepared mixed melt into the crystal growth furnace, fix the obtained seed...

Embodiment 3

[0080] Growth of calcium metaborate birefringent crystals by melt pulling method:

[0081] By chemical formula: CaCO 3 +2H 3 BO 3 →CaB 2 o 4 +CO 2 ↑+H 2 O↑Preparation of calcium metaborate birefringent crystals, the raw material CaCO 3 and H 3 BO 3 Analytical pure (≥99%);

[0082] CaCO 3 and H 3 BO 3 According to the molar ratio of calcium: boron = 1:2, mix well and grind thoroughly, then put it into a corundum crucible and pre-fire at an internal temperature of 300°C for 4 hours, take it out, grind it and compact it, then raise it to 900°C, keep it warm for 2 days, and obtain calcium 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 calcium metaborate single crystal is ground into powder;

[0083] Put the polycrystalline powder of the synthesized calcium metaborate compound into a platinum crucible, heat to a temperature of 1160°C, and keep the temp...

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Abstract

The invention relates to a calcium metaborate birefraction crystal as well as a preparation method and a purpose thereof. The chemical formula of the crystal is CaB2O4; the molecular weight is 125.70;the crystal belongs to an orthorhombic system; the space group is Pbcn; the crystal cell parameters a being equal to 11.60(4) angstrom, b being equal to 4.28(8) angstrom and c being equal to 6.21(6)angstrom; Z is 4. The calcium metaborate birefraction crystal is a negative biaxial crystal; the transmission range is 165 to 3400nm; the birefraction rate is 0.09 to 0.36; a flux method, a cosolventmethod, a crucible descending method or a heat exchange method is used for growing the crystals . The crystal obtained by the method can easily grow, can be easily processed, can be used for infraredray-visible light-ultraviolet-deep ultraviolet wave bands for manufacturing polarized beam splitting prims such as Glan prisms, Wollaston prisms and Rochon prisms and optical elements such as optoisolators, circulator and light beam displacement devices, and has the important application in the fields of optics, laser etching and communication.

Description

technical field [0001] The present invention relates to a kind of molecular formula that is used for infrared-visible-deep ultraviolet-deep ultraviolet band is CaB 2 o 4 The calcium metaborate birefringent crystal and its preparation method and application belong to the technical field of crystal materials and the field of optical technology. Background technique [0002] When a light beam is incident on an anisotropic crystal material, the phenomenon that it is decomposed into two beams and refracted in different directions is called birefringence. The two beams of light generated by birefringence are linearly polarized lights whose polarization directions are perpendicular to each other. 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/16C30B11/02C30B11/00C30B15/00
CPCC30B11/00C30B11/02C30B15/00C30B29/16C01B35/126C30B9/12C30B17/00C30B29/22G02B5/3083G02B27/283C01P2002/72C30B15/20G02B1/08
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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