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Growth process capable of reducing barium boron oxide (BBO) crystal envelope

A crystal growth and process technology, applied in the direction of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of insufficient convection, easy to bring the envelope, affecting the crystal quality and so on

Inactive Publication Date: 2016-10-26
FUJIAN CASTECH CRYSTALS
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  • Abstract
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Problems solved by technology

[0004] Barium metaborate β-BaB2O4 is generally grown by the flux method. After the crystal grows to the crucible wall, it stops rotating and begins to cool down to grow. The melt mainly relies on its own temperature gradient to cause convection. Flat bottom crucibles have insufficient bottom convection and blind areas, etc. The problem is that in addition to the central area, the grown crystals are also prone to enveloping, which affects the quality of the crystals

Method used

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  • Growth process capable of reducing barium boron oxide (BBO) crystal envelope

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Embodiment 1

[0007] Example 1: Weigh a certain amount of barium carbonate, boric acid and sodium fluoride to meet BaB2O4:NaF=2:1 (molar ratio) and mix them in a raw material barrel. Melt the mixed material in a silicon carbide rod furnace at 1000°C until the reaction is complete. Pour the molten material into a platinum crucible with an inwardly convex arc at the bottom, then place it in a molten salt furnace, raise the temperature to 980°C, keep the temperature constant for 18 hours, and then set it at 10°C above the saturation temperature. Slowly lower the seed crystal previously fixed on the seed rod to the surface of the melt, rotate it at 4-10r / min, and the crystal begins to grow. When the crystal grows fast to the crucible wall, stop the crystal rotation, and start at 1°C / day. The temperature is lowered at a rate until about 6 months, the growth stops, and the BBO crystal blank is obtained.

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Abstract

Provided is a growth process capable of reducing barium boron oxide (BBO) crystal envelope. According to the growth process, barium carbonate and boric acid are adopted as main raw materials, sodium fluoride is a fluxing agent, a self-made molten salt furnace and a platinum crucible are growth devices, the bottom of the platinum crucible is in a recessed arc shape, and low temperature phase BBO crystal growth by a flux method is performed. The bottom of the platinum crucible is in the recessed arc shape, melt convection is reinforced, and the BBO crystal envelope is effectively reduced.

Description

technical field [0001] The invention relates to the field of crystal growth, in particular to a growth process for reducing the envelope of BBO crystals. Background technique [0002] Low-temperature phase barium metaborate is a very important new nonlinear crystal with wide light transmission range, large effective frequency doubling coefficient, large birefringence and high laser damage threshold, and is widely used in Nd:YAG and Nd :Double, triple, quadruple, and quintuple frequency of YLF laser, frequency doubling, tripling and frequency mixing of dye laser, 2, 3, and 4 frequency doubling of Ti:Sappire and Alexandrite laser, optical parametric amplifier (OPA) and optics Parametric oscillator (OPO), frequency doubling of argon ion, ruby ​​and Cu vapor lasers, etc. There is no material with better performance to replace it. [0003] The molten salt method (flux method) is a growth method commonly used in artificial crystal growth. It usually adopts the method of dissolv...

Claims

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Application Information

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IPC IPC(8): C30B9/12C30B29/10
CPCC30B9/12C30B29/10
Inventor 王昌运
Owner FUJIAN CASTECH CRYSTALS
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