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Method for inducing and separating out orientation controllable lithium niobate single crystal in glass by using femtosecond laser

A technology of femtosecond laser and lithium niobate, which is applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., to achieve the effect of broad application prospects

Inactive Publication Date: 2011-08-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN200410018446.3 also successfully uses femtosecond laser to induce the precipitation of functional crystal materials inside the glass, but there is no report on the formation of single crystal and the control of its growth orientation

Method used

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  • Method for inducing and separating out orientation controllable lithium niobate single crystal in glass by using femtosecond laser
  • Method for inducing and separating out orientation controllable lithium niobate single crystal in glass by using femtosecond laser

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Embodiment 1

[0013] First prepare the mole percentage as SiO 2 : Li 2 O: Nb 2 o 5 = 34%: 33%; 33%. Glass 34SiO 2 ·33Li 2 O·33Nb 2 o 5 (mol%). Using quartz sand, lithium carbonate, and niobium oxide as the main raw materials, first weigh 7.14 grams of quartz sand, 13.44 grams of lithium carbonate, and 30.73 grams of niobium oxide, grind and mix the above materials, put them into a quartz crucible or a platinum crucible, and place Put it into a high-temperature furnace; melt at 1400°C for 2 hours to melt the raw materials into a liquid state and mix the molten materials evenly. After heating the molten material at a constant temperature for 2 hours, take out the crucible from the high-temperature furnace, quickly pour the molten material in the crucible onto the preheated mold to form a glass sample, put the glass sample into a furnace at 550°C, and slowly cool down and anneal for 12 hours , the annealed glass is cut and polished to obtain a light yellow transparent glass carrier. F...

Embodiment 2

[0017] First prepare the mole percentage as SiO 2 : Li 2 O: Nb 2 o 5 = 34%: 33%; 33%. Glass 34SiO 2 ·33Li 2 O·33Nb 2 o 5 (mol%). Using quartz sand, lithium carbonate, and niobium oxide as the main raw materials, first weigh 7.14 grams of quartz sand, 13.44 grams of lithium carbonate, and 30.73 grams of niobium oxide, grind and mix the above materials, put them into a quartz crucible or a platinum crucible, and place Put it into a high-temperature furnace; melt at 1400°C for 2 hours to melt the raw materials into a liquid state and mix the molten materials evenly. After heating the molten material at a constant temperature for 2 hours, take out the crucible from the high-temperature furnace, quickly pour the molten material in the crucible onto the preheated mold to form a glass sample, put the glass sample into a furnace at 550°C, and slowly cool down and anneal for 12 hours , the annealed glass is cut and polished to obtain a light yellow transparent glass carrier. F...

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Abstract

The invention relates to a method for inducing and separating out orientation controllable lithium niobate single crystal in glass by using femtosecond laser, belongs to the technical field of laser application, and also belongs to the technical field of new material development. The lithium niobate single crystal is induced and separated out under the irradiation of the femtosecond laser by adopting an ytterbium-doped optical fiber amplifier and a frequency adjustable laser device. The method is characterized in that: femtosecond laser beams are focused at 100 to 1,000 microns below the surface of the glass through a focusing lens, the lithium niobate single crystal can be selectively induced and separated out in the glass by strictly controlling the frequency of laser, the pulse energy, the modifying direction of the laser, the scanning speed and the scanning direction, and the growing orientation of the lithium niobate single crystal can be controlled; and the femtosecond laser has the control parameters that: the wavelength is 1,030 nanometers, the frequency is 250 to 500KHz, the pulse width is 240 to 300fs, the pulse energy is 0.5 to 2.5muJ, the numerical aperture of the focusing lens is 0.4 to 0.8, the scanning speed is 0 to 210mum / s, and the modifying direction of the laser is controlled through a polarizer. The induced and separated lithium niobate single crystal is an excellent ferroelectric material; and because of photoelectric, pyroelectric, piezoelectric, photorefractive and nonlinear properties, the lithium niobate single crystal has broad application prospect in the fields of acoustics and optics, photo-electricity, nonlinear optics and the like.

Description

technical field [0001] The invention relates to a preparation method for inducing precipitation of lithium niobate single crystal inside glass by using a femtosecond laser, in particular, the growth orientation of the crystal can be controlled by adjusting laser parameters. Induced precipitation of lithium niobate single crystal is one of the most widely used new inorganic materials at present, and can be widely used in laser frequency doubling, surface acoustic wave devices, optical modulators, electro-optic cells, optical parametric oscillators, optical switches, etc. Photoelectric components. Background technique [0002] Using femtosecond laser to induce crystallization inside the glass and micro-design the crystal orientation in three-dimensional space has very important guiding significance for the preparation of new composite materials and laser application technology research fields. In recent years, based on femtosecond laser technology, space-selective induced cry...

Claims

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Application Information

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IPC IPC(8): C30B29/30C30B1/02C30B30/00
Inventor 范茬兴曾惠丹伯特兰·普梅内克陈国荣马修·朗克里
Owner EAST CHINA UNIV OF SCI & TECH
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