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Borate birefringent crystal for ultraviolet band as well as growing method and purpose of same

A technology of birefringent crystals and ultraviolet bands, applied in the directions of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of crystal quality, crystal deliquescence, and limited use, and achieve easy storage, easy polishing, and easy grinding Effect

Inactive Publication Date: 2013-05-01
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High temperature phase BaB 2 o 4 The transmission range of (α-BBO) crystal is 189-3500nm, and the birefringence is relatively large, but the crystal is easy to deliquescence, and due to the solid-state phase transition of the crystal, it is easy to crack during the growth process, which has a great impact on the quality of the crystal;
[0004] Ca 3 (BO 3 ) 2 The transmission range of the crystal is 180-3800nm. The disadvantage is that the birefringence in the visible region is relatively small, and the transmission in the ultraviolet region is not high, which limits its use.

Method used

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  • Borate birefringent crystal for ultraviolet band as well as growing method and purpose of same
  • Borate birefringent crystal for ultraviolet band as well as growing method and purpose of same
  • Borate birefringent crystal for ultraviolet band as well as growing method and purpose of same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, melt spontaneous crystallization method grows KBaSc (B 3 o 6 )2 :

[0029]

[0030] (The molar ratio of K, Ba, Sc and B is 1:1:1:6)

[0031] The specific steps are as follows: after weighing the above raw materials, put them into a mortar for mixing and grinding, then put them into a platinum crucible with a diameter of 50 mm (diameter) × 12 mm, heat to a molten state, stir for 48 hours, and determine the above Mix the saturation point temperature of the melt, set the temperature at 10°C above the saturation temperature, put the unbound seed crystal rod into the melt, and then lower the temperature at a rate of 0.5°C / h to make it spontaneously crystallize, After crystallization, the cooling rate is set to 1°C / h, and the crystal grows gradually. When the crystal grows to a certain size, the crystal is lifted from the liquid surface, and the temperature is lowered to room temperature at a rate of 20°C / h to obtain a 12mm×10mm x 2mm crystal.

Embodiment 2

[0032] Embodiment 2, melt spontaneous crystallization method grows KBaSc (B 3 o 6 ) 2 :

[0033]

[0034] (The molar ratio of K, Ba, Sc and B is 1:1:1:6)

[0035] The specific steps are as follows: after weighing the above raw materials, put them into a mortar for mixing and grinding, then put them into a 50mm (diameter)×12mm platinum crucible, heat to a molten state, stir for 24 hours, and determine the above mixing The saturation point temperature of the melt, the temperature is set at 5°C above the saturation temperature, the seed crystal rod without the seed crystal is put into the melt, and then the temperature is lowered at a rate of 1.0°C / h to make it spontaneously crystallize. After crystallization, the cooling rate is set to 1°C / h, and the crystal grows gradually. When the crystal grows to a certain size, the crystal is lifted from the liquid surface, and the temperature is lowered to room temperature at a rate of 30°C / h to obtain a 14mm×10mm× 3mm crystal.

Embodiment 3

[0036] Embodiment 3, melt spontaneous crystallization method grows KBaSc (B 3 o 6 ) 2 :

[0037]

[0038] (The molar ratio of K, Ba, Sc and B is 1:1:1:6)

[0039] The specific steps are as follows: after weighing the above raw materials, put them into a mortar, mix and grind them, then put them into a 50mm (diameter)×12mm platinum crucible, heat to a molten state, stir for 48 hours, and determine the above mixing The saturation point temperature of the melt, the temperature is set at 10°C above the saturation temperature, the seed rod without the seed crystal is put into the melt, and then the temperature is lowered at a rate of 0.05°C / h to make it spontaneously crystallize. After crystallization, the cooling rate is set to 1°C / h, and the crystal grows gradually. When the crystal grows to a certain size, the crystal is lifted from the liquid surface, and the temperature is lowered to room temperature at a rate of 20°C / h to obtain a 13mm×10mm× 2mm crystal.

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Abstract

The invention relates to a borate birefringent crystal for an ultraviolet band. The chemical formula of the borate birefringent crystal is KBaSc(B3O6)2 and belongs to a trigonal system; an atom K and an atom Ba in a crystal structure are in disordered mixed occupation; a space group is R-3 and a cell parameter Z is 3; the transmission range is 184-3000 nm; a calculated value n0 of the refractive index at gamma of 589 nm is 1.6168, ne is 1.5079 and delta n is 0.1089; the crystal grows by using a self-melting and spontaneous crystallization method or a flux growth method; the crystal is easy to grow, cut, grind, polish and preserve, is stable in the air, is uneasy for deliquescence and is insoluble in water; the crystal can be used for making polarization beam splitters such as Glan prisms, Wollaston prisms, Rochon prisms or beam splitting polarizers; and the crystal is importantly applied to the optical and communication fields.

Description

technical field [0001] The present invention relates to a kind of borate birefringent crystal, especially the chemical formula suitable for ultraviolet band is KBaSc(B 3 o 6 ) 2 birefringent crystals and their preparation and use. Background technique [0002] Birefringence is one of the important characteristics of light propagating in anisotropic media. When light enters an anisotropic medium, it is decomposed into two beams of light and refracted along different directions. The two outgoing beams are linearly polarized lights with vibration directions perpendicular to each other, and one of them obeys the law of refraction is called ordinary light. (o light), whose refractive index is n o Indicates that another beam that does not follow the law of refraction is called extraordinary light (e light), and its refractive index is expressed by n e This phenomenon is called birefringence, and crystals with anisotropy are called birefringent crystals. Using this property o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B11/00C30B15/00C30B9/12
Inventor 李如康高昕
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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