Crystal growth method for reducing absorption of LBO crystal body and crystal prepared by crystal growth method

A technology of crystal growth and volume absorption, applied in the directions of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of high melt viscosity, affecting the yield of LBO crystal, etc., to improve crystal quality, reduce crystal envelope, The effect of preventing falling

Active Publication Date: 2020-12-25
FUJIAN CASTECH CRYSTALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the existing boric acid preparation method, the volume absorption value of LBO crystals can be reduced to a limited value, and boric acid is used as a cosolvent system, and the melt viscosity is very large, which makes the enveloping situation in the growth of LBO crystals more serious and affects the LBO crystal growth. Crystal Yield

Method used

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  • Crystal growth method for reducing absorption of LBO crystal body and crystal prepared by crystal growth method
  • Crystal growth method for reducing absorption of LBO crystal body and crystal prepared by crystal growth method
  • Crystal growth method for reducing absorption of LBO crystal body and crystal prepared by crystal growth method

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Embodiment 1

[0042] Embodiment 1: In this embodiment, the platinum seed rod has a plurality of platinum sheets parallel and inclined upward at 45°, and the growth crucible is an ordinary platinum crucible.

[0043] Mix boric acid and lithium carbonate at a molar ratio of 1:8, put them in a pvc bottle, and mix them with a shaker for no less than 10 hours. Melt the mixed raw materials in a sintering furnace and pour them into a cylindrical ordinary growth crucible. Place the growth crucible in a sealed furnace shell and heat up to 800°C, stir for 5 days, take out the stirring paddle, keep the temperature at a constant temperature for 24 hours, and slowly drop to the crystallization temperature to prepare the processed seed crystal, fix it on the platinum seed rod, and slowly penetrate into the Melt, until it just touches the liquid surface, turn on the seed rod to rotate at a speed of 30r / min, then cool down at 0.1°C / d until the end of growth, take out the crystal, and test it with a volume a...

Embodiment 2

[0044] Embodiment 2: In this embodiment, the platinum seed rod has a plurality of platinum sheets parallel and inclined upward at 45°, and the growth crucible is a beam-waisted platinum crucible.

[0045]Mix boric acid and lithium carbonate at a molar ratio of 1:8, place them in a pvc bottle, and mix them evenly with a throwing machine. Waist-shaped platinum crucible growth, put the waist-shaped platinum crucible in a sealed furnace shell and raise the temperature to 800°C, stir for 5 days, take out the stirring paddle, keep the temperature at constant temperature for 24 hours, and slowly drop to the crystallization temperature. On the above-mentioned platinum seed rod, slowly penetrate into the melt until it just touches the liquid surface, turn on the seed rod to rotate at a speed of 30r / min, then cool down at 0.1°C / d until the growth is over, take out the crystal, and test it with a volume absorption tester , the body absorption is 30ppm / cm, and the inner envelope of the cr...

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Abstract

The invention relates to a crystal growth method for reducing absorption of an LBO crystal body and a crystal prepared by the crystal growth method. According to the method, boric acid and lithium carbonate are used as raw materials, a kidney-shaped platinum crucible and a platinum seed crystal rod are used as growth devices, the platinum seed crystal rod is provided with a plurality of parallel and obliquely upward platinum sheets, and the kidney-shaped platinum crucible is of an up-down and left-right axisymmetric structure with a small middle part and two large ends According to the invention, the plurality of parallel platinum sheets are arranged on the platinum seed crystal rod to dissipate heat of the platinum rod, so that the absorption value is reduced; the platinum sheets are designed in an upward inclined manner, so that seeding of the seed crystal and observation of the crystal growth process are not influenced, and volatile matters are prevented from falling into the platinum sheets; and a special temperature field formed by the large two ends and the small middle part of the specially-designed kidney-shaped platinum crucible is utilized, so that the influence of a specific platinum seed crystal rod on the temperature field is avoided, meanwhile, melt flowing is accelerated, the viscosity of a boric acid system is reduced, crystal enveloping is reduced, and the crystal quality is improved.

Description

technical field [0001] The invention relates to the field of crystal growth, in particular to a crystal growth method for reducing LBO crystal volume absorption and improving crystal growth quality. Background technique [0002] LBO crystal is a kind of nonlinear optical crystal with excellent optical performance. It has wide transmission range, high optical uniformity, relatively large effective double frequency coefficient and high laser damage threshold. It has important and extensive applications in optoelectronic technology, and is widely used in the fields of laser frequency conversion, optical parametric oscillation and optical parametric amplification. As the laser power becomes higher and higher, higher requirements are placed on the absorption of LBO crystal devices. [0003] The conventional method of growing LBO crystals uses corundum seed rods, molybdenum and other co-solvents, and the grown crystals have an absorption value of more than 300-400 ppm / cm due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B17/00
CPCC30B17/00C30B29/22
Inventor 王昌运陈伟张星陈秋华
Owner FUJIAN CASTECH CRYSTALS
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