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Deep ultraviolet magnesium fluoride crystal growth method

A technology of crystal growth and magnesium fluoride, which is applied in crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of poor integrity of magnesium fluoride crystal growth, low transmittance in the ultraviolet band, and difficult industrial production, etc., to achieve Large crystal size, high yield and good integrity

Inactive Publication Date: 2013-02-13
合肥嘉东光学股份有限公司
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  • Summary
  • Abstract
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Problems solved by technology

[0002] Ultraviolet-grade magnesium fluoride single crystal has a wide transmission range and high transmittance, and has a certain birefringence coefficient. It can be used in the field of optical fiber communication and the production of optical components such as optical prisms, lenses and windows. Magnesium oxide single crystals are widely used in laser, infrared, ultraviolet optics, high-energy detection, optical communication systems and military fields. At present, the industry generally adopts the crucible descending method to prepare, through resistance heating, melting the mixed raw materials in the crucible, through planting, Necking, equal diameter and other operations grow crystals in a certain direction, but the magnesium fluoride crystals produced by the crucible drop method have poor growth integrity, small size, low ultraviolet band transmittance, and low yield, making it difficult to realize industrial production.

Method used

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  • Deep ultraviolet magnesium fluoride crystal growth method

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Embodiment 1

[0018] Embodiment 1: the present embodiment carries out as follows:

[0019] 1. MgF with a purity greater than 99.99% and a molar ratio of 1:0.02 2 and ZnF 2 After the powder is mixed with MgF in [001] direction 2 Single crystals were placed in platinum crucibles with a thickness of 1 mm.

[0020] 2. Put the platinum crucible into the single crystal furnace and raise the temperature to 700°C for 2 hours to deoxidize 2 The generated ZnO is volatilized, and then the single crystal furnace is fed with nitrogen gas, and then the temperature is continuously raised until the raw materials are completely melted.

[0021] 3. When the raw materials are completely melted, control the furnace temperature at 900°C, and then use MgF 2 The single crystal is planted at a speed of 10cm / h, the growth temperature gradient is 60°C / cm, and the rising speed is 1.8mm / h. The open pulling method grows deep ultraviolet magnesium fluoride, and the growth cycle is 5 days to obtain deep ultraviolet m...

Embodiment 2

[0022] Embodiment 2: the present embodiment carries out as follows:

[0023] 1. MgF with a purity greater than 99.99% and a molar ratio of 1:0.02 2 and ZnF 2 After the powder is mixed with MgF in [001] direction 2 The single crystal was put into a platinum crucible with a thickness of 1.2 mm.

[0024] 2. Put the platinum crucible into the single crystal furnace and raise the temperature to 800°C for 2 hours to deoxidize 2 The generated ZnO is volatilized, and then the single crystal furnace is fed with nitrogen gas, and then the temperature is continuously raised until the raw materials are completely melted.

[0025] 3. When the raw materials are completely melted, control the furnace temperature at 1200°C, and then use MgF 2 The single crystal is planted at a speed of 10cm / h, the growth temperature gradient is 90°C / cm, and the rising speed is 1.8mm / h. The open pulling method grows deep ultraviolet magnesium fluoride, and the growth cycle is 5 days to obtain deep ultravio...

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Abstract

The invention discloses deep ultraviolet magnesium fluoride crystal growth method and relates to the technical field of single crystal growth. The method comprises the steps of placing mixed powder of magnesium fluoride (MgF2) and zinc fluoride (ZnF2), and seed crystal in a platinum crucible, placing the platinum crucible into a single crystal furnace, adding nitrogen into the single crystal furnace, and growing magnesium fluoride single crystal by means of an open-type czochralski method. The method is good in integrity of grown crystal, bubble-free and inclusion-complex-free, large in crystal size, not prone to cracking, high in ultraviolet band transmittance rate, high in yield, simple in process equipment, low in energy consumption, and beneficial for industrial production.

Description

Technical field: [0001] The invention relates to the technical field of single crystal growth, in particular to a deep ultraviolet magnesium fluoride crystal growth method. Background technique: [0002] Ultraviolet-grade magnesium fluoride single crystal has a wide transmission range and high transmittance, and has a certain birefringence coefficient. It can be used in the field of optical fiber communication and the production of optical components such as optical prisms, lenses and windows. Magnesium oxide single crystals are widely used in laser, infrared, ultraviolet optics, high-energy detection, optical communication systems and military fields. At present, the industry generally adopts the crucible descending method to prepare, through resistance heating, melting the mixed raw materials in the crucible, through planting, Necking, equal diameter and other operations grow crystals in a certain direction, but the magnesium fluoride crystals produced by the crucible drop...

Claims

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Application Information

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IPC IPC(8): C30B15/00C30B29/12
Inventor 王冬胡卫东
Owner 合肥嘉东光学股份有限公司
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