Search

CN-122010402-A - Method and device for realizing directional high-yield crystallization in glass

CN122010402ACN 122010402 ACN122010402 ACN 122010402ACN-122010402-A

Abstract

Applying femtosecond laser pulse to the interior of glass to make modifier ions and forming agent ions in the interior of glass directionally migrate in a laser irradiation area and form an ion component gradient distribution area due to different migration speeds, and controlling the femtosecond laser pulse to make the path of the ion component gradient distribution area in a preset direction shortest or make the ion concentration difference of the boundary of the ion component gradient distribution area in the preset direction largest; the glass is subjected to heat treatment, so that ions forming gradient distribution are further diffused, ion diffusion flux along a preset direction is maximum, and ions in the glass tend to nucleate and grow along the preset direction in a laser irradiation area, so that a nano crystal structure with uniform orientation is formed. The above treatment can ensure the precipitation yield of the crystal and simultaneously can accurately control the precipitation position and the growth direction of the nano crystal.

Inventors

  • ZHANG JINGYU
  • LIU YANXIA

Assignees

  • 华中科技大学

Dates

Publication Date
20260512
Application Date
20260130

Claims (10)

  1. 1. The method for realizing directional high-yield crystallization in glass is characterized by comprising the following steps: S1, applying femtosecond laser pulses to the interior of glass, so that modifier ions and forming agent ions in the interior of the glass directionally migrate in a laser irradiation area and form an ion component gradient distribution area due to different migration speeds, and controlling the femtosecond laser pulses to enable the path of the ion component gradient distribution area in a preset direction to be shortest or enable the ion concentration difference of the boundary of the ion component gradient distribution area in the preset direction to be largest; And S2, carrying out heat treatment on the glass, so that ions forming gradient distribution are further diffused, the ion diffusion flux along the preset direction is maximum, and ions in the glass tend to nucleate and grow along the preset direction in a laser irradiation area, so that a nano crystal structure with uniform orientation is formed.
  2. 2. The method for realizing glass internal directional high-yield crystallization according to claim 1, wherein the femtosecond laser pulse is linear polarized laser with a preset direction as a polarization direction, the linear polarized laser can generate a plurality of independent elliptic phase separation nano-structure blocks with a short axis direction as a preset direction in a laser irradiation area, the elliptic phase separation nano-structure blocks are ion component gradient distribution areas, and crystals growing along the short axis direction are precipitated inside each elliptic phase separation nano-structure block after the heat treatment is carried out.
  3. 3. The method for realizing directional high-yield crystallization in glass according to claim 2, wherein the oval phase separation nanostructure block has a major axis size ranging from 50nm to 400 nm and a minor axis size ranging from 20 nm to 250 nm.
  4. 4. The method for realizing directional high yield crystallization inside glass according to claim 2, wherein the repetition rate of the linearly polarized laser is not more than 250kHz, and the scanning speed of the laser is not more than 0.5mm/s.
  5. 5. The method for achieving directional high-yield crystallization inside glass according to claim 1, wherein the femtosecond laser pulse scans the glass in a scanning direction perpendicular to the preset direction and can generate gradient distribution along the preset direction at the boundary of a modified region formed by laser irradiation during scanning, and a nanocrystal structure grown perpendicular to the scanning direction is generated at the boundary of the modified region formed by laser irradiation after the heat treatment is performed.
  6. 6. The method for achieving directional high-yield crystallization inside glass according to claim 5, wherein the repetition rate of the femtosecond laser pulse is not lower than 300kHz.
  7. 7. The method for achieving directional high-yield crystallization inside glass according to claim 5, wherein the single pulse energy of the femtosecond laser pulse is not higher than 2000nJ, and the scanning speed of the laser is not lower than 0.05mm/s.
  8. 8. The method for achieving directional high yield crystallization inside glass according to any one of claims 1 to 7, wherein the treatment temperature for heat treating the glass is within a range of ±50 ℃ of the peak position temperature of glass crystallization.
  9. 9. The method of achieving high yield of crystallization from the interior of glass according to any one of claims 1 to 7, wherein the glass is lithium disilicate glass and the orientation of the nanocrystalline structure formed within the lithium disilicate glass is c-axis.
  10. 10. The device for realizing directional high-yield crystallization in glass is characterized by comprising the following components: The femtosecond laser component is used for applying femtosecond laser pulses to the interior of the glass, so that modifier ions and forming agent ions in the interior of the glass directionally migrate in a laser irradiation area and form an ion component gradient distribution area due to different migration speeds, and the femtosecond laser pulses are controlled to enable the path of the ion component gradient distribution area in a preset direction to be shortest or enable the ion concentration difference of the boundary of the ion component gradient distribution area in the preset direction to be largest; And the heating component is used for carrying out heat treatment on the glass, so that ions forming gradient distribution are further diffused, the ion diffusion flux along the preset direction is maximum, and ions in the glass tend to nucleate and grow along the preset direction in a laser irradiation area, so that a nano crystal structure with consistent orientation is formed.

Description

Method and device for realizing directional high-yield crystallization in glass Technical Field The invention belongs to the technical field of laser processing, and particularly relates to a method and a device for realizing directional high-yield crystallization in glass. Background The precise regulation of the orientation and position of the nanostructure in the homogeneous material is one of the core challenges for breaking through the performance bottleneck of the high-performance photonic device. Taking glass material as an example, the precipitation of oriented nanocrystals is realized inside the matrix through a controlled crystallization process, which can impart anisotropic optical functions while maintaining high light transmittance. However, although the conventional heat treatment process can realize large-scale crystal growth and obtain higher yield, it is difficult to precisely control the precipitation position and growth orientation of the crystals, so that the crystals are generally randomly arranged and macroscopically isotropic. In recent years, the femtosecond laser direct writing technology can regulate and control the precipitation position of crystals by virtue of high flexibility, three-dimensional space selectivity and precise controllability of heat accumulation effect, and the technology has become one of the common means for realizing glass microcrystallization. However, although femtosecond laser direct writing can control the precipitation position of crystals, for most materials, it is still difficult to control the crystal growth orientation, and the inherent micrometer-sized action volume of the femtosecond laser and the relatively narrow crystal growth temperature window severely limit the yield and overall processing efficiency of the precipitable nanocrystals in a single process. Therefore, how to control the precipitation position and growth direction of the nanocrystals while ensuring the precipitation yield of the crystals is a technical problem to be solved at present. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a method and a device for realizing directional high-yield crystallization in glass, and aims to ensure the crystallization yield and accurately control the crystallization position and the growth direction of nanocrystals. According to a first aspect of the present invention, there is provided a method for achieving directional high-yield crystallization inside glass, comprising: S1, applying femtosecond laser pulses to the interior of glass, so that modifier ions and forming agent ions in the interior of the glass directionally migrate in a laser irradiation area and form an ion component gradient distribution area due to different migration speeds, and controlling the femtosecond laser pulses to enable the path of the ion component gradient distribution area in a preset direction to be shortest or enable the ion concentration difference of the boundary of the ion component gradient distribution area in the preset direction to be largest; And S2, carrying out heat treatment on the glass, so that ions forming gradient distribution are further diffused, the ion diffusion flux along the preset direction is maximum, and ions in the glass tend to nucleate and grow along the preset direction in a laser irradiation area, so that a nano crystal structure with uniform orientation is formed. According to a second aspect of the present invention, there is provided an apparatus for achieving directional high-yield crystallization inside glass, comprising: The femtosecond laser component is used for applying femtosecond laser pulses to the interior of the glass, so that modifier ions and forming agent ions in the interior of the glass directionally migrate in a laser irradiation area and form an ion component gradient distribution area due to different migration speeds, and the femtosecond laser pulses are controlled to enable the path of the ion component gradient distribution area in a preset direction to be shortest or enable the ion concentration difference of the boundary of the ion component gradient distribution area in the preset direction to be largest; And the heating component is used for carrying out heat treatment on the glass, so that ions forming gradient distribution are further diffused, the ion diffusion flux along the preset direction is maximum, and ions in the glass tend to nucleate and grow along the preset direction in a laser irradiation area, so that a nano crystal structure with consistent orientation is formed. In general, compared with the prior art, the technical scheme designed by the invention has the following main beneficial effects: in the method for realizing directional high-yield crystallization in glass, in the step S1, femtosecond laser pulse is applied to the glass, and forming agent ions and modifier ions in a glass network directionally migrate, so that the migra