Process for preparing low-temperature phase barium metaborate monocrystalline film

A technology of barium metaborate and single crystal thin film, which is applied in the direction of single crystal growth, chemical instruments and methods, crystal growth, etc., can solve the problems of low mechanical strength, group velocity mismatch, deformation, etc., and achieve good economic benefits and save energy. material effect

Inactive Publication Date: 2005-06-29
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The growth rate is slow and the growth cycle is long, and the growth cycle of a single crystal is as long as 1 to 3 months;
[0006] (2) These technologies can be used to obtain larger bulk single crystals, but with the development of laser technology towards integration and miniaturization, especially in the field of femtosecond laser technology, in order to overcome the fundamental frequency light and The problem of group velocity mismatch between frequency doubling lights often requires thinner β-BBO crystals as frequency doubling devices (see Acta Optics Sinica, V

Method used

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  • Process for preparing low-temperature phase barium metaborate monocrystalline film
  • Process for preparing low-temperature phase barium metaborate monocrystalline film
  • Process for preparing low-temperature phase barium metaborate monocrystalline film

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In a platinum crucible of φ100×80mm, Li with pores was placed 2 CO 3 and Al 2 O 3 A total of 100 grams of mixed material, including Al 2 O 3 Content 88 grams, Li 2 CO 3 Content 12 grams. The (001) face α-BBO wafer (size: 10×10×0.5 mm) polished on both sides 3 ) on the platinum wire, and the wafer is covered with the same proportion of Li 2 CO 3 and Al 2 O 3 Mix 30 grams of powder and the crucible cover of the thermocouple, the top of the crucible is sealed with a platinum cover, placed in a resistance furnace, heated to 850 °C at 20 °C / hour, kept at a constant temperature for 6 hours, and then lowered to room temperature at a cooling rate of 30 °C / hour .

[0024] figure 2 The X-ray diffraction analysis of the surface of the sample in this example shows that a β-BBO film with a preferred orientation of (001) is formed on the surface of the sample. The X-ray twin crystal rocking experiment of the sample is as follows image 3 , it indicates that the β-BBO ...

Embodiment 2

[0026] In a platinum crucible of φ100×80mm, Li with pores was placed 2 CO 3 and Al 2 O 3 A total of 100 grams of mixed material, including Al 2 O 3 Content 95 grams, Li 2 CO 3 Content 5 grams. The double-sided polished (001) plane α-BBO wafer was placed on a platinum wire, and the wafer was covered with the same proportion of Li 2 CO 3 and Al 2 O 3 Mix 30 grams of powder and the crucible cover of the thermocouple, seal the top of the crucible with a platinum cover, place it in a resistance furnace, raise the temperature at 100°C / hour to 1000°C, maintain a constant temperature for 2 hours, and then cool down to room temperature at a rate of 80°C / hour . The results showed that β-BBO thin films were formed on the surface of α-BBO wafers.

Embodiment 3

[0028] In a platinum crucible of φ100×80mm, Li with pores was placed 2 CO 3 and Al 2 O 3 A total of 100 grams of mixed material, including Al 2 O 3 Content 5 grams, Li 2 CO 3 Content 95 grams. The double-sided polished (001) plane α-BBO wafer was placed on a platinum wire, and the wafer was covered with the same proportion of Li 2 CO 3 and Al 2 O 3 Mix 30 grams of powder and the crucible cover of the thermocouple, the top of the crucible is sealed with a platinum cover, placed in a resistance furnace, heated to 700 °C at 50 °C / hour, kept at a constant temperature for 100 hours, and then lowered to room temperature at a cooling rate of 100 °C / hour , to obtain β-BBO thin films.

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Abstract

A method for preparing a low-temperature phase barium metaborate single crystal thin film, comprising the following specific steps: placing a Li2CO3 and Al2O3 mixed material block with pores in a platinum crucible; placing or suspending a double-sided polished α-BBO wafer on On the platinum wire, add a crucible cover covered with Li2CO3 and Al2O3 mixed powder and a thermocouple, seal the top of the crucible with a platinum cover, and place it in a resistance furnace; the resistance furnace is heated to 700-1000°C and kept at a constant temperature for 2-100 hours , Li2O diffuses into the α-BBO wafer, and undergoes a solid-state reaction with the α-BBO wafer, so that the surface layer of the α-BBO wafer undergoes a phase change to form a β-BBO single crystal thin film. The method can grow micron-scale β-BBO single crystal thin films meeting requirements on α-BBO substrates, not only saves materials, but also can be produced in batches, which is of great significance to the development of laser technology and integrated optics.

Description

technical field [0001] The invention relates to a preparation method of a low-temperature phase barium metaborate (β-BBO) single crystal thin film, in particular, a low temperature phase is prepared on a high temperature phase barium metaborate (α-BBO) single crystal substrate by adopting a gas phase transport equilibrium technology The method of barium metaborate single crystal thin film forms a β-BBO / α-BBO single crystal composite thin film material, and the material has a very wide application prospect. Background technique [0002] Barium Metaborate BaB 2 O 4 (hereinafter referred to as BBO) has two phases, a high temperature phase (α phase) and a low temperature phase (β phase), and its phase transition temperature is 925°C. α-BBO crystal has a center of symmetry and is a UV birefringent crystal with excellent performance, which can be grown by ordinary pulling method and crucible descending method (see Journal of Crystal Growth, Vol. 191, 1998, p. 517, and patent ZL9...

Claims

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Application Information

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IPC IPC(8): C30B1/10
Inventor 周国清刘军芳徐军何晓明夏长泰
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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