A device and method for reducing the number of pulses required for introducing a femtosecond laser into a structure

A femtosecond laser and laser pulse technology, used in laser welding equipment, metal processing equipment, welding equipment, etc., can solve the problems of long generation time, difficult to meet the optical storage, and many pulses, to improve the generation speed and reduce pulses. Quantity and practicality

Active Publication Date: 2021-06-11
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a device and method for reducing the number of pulses required for femtosecond laser introduction into the structure, the purpose of which is to solve the problem that the existing method for producing nano-gratings requires a large number of pulses, The generation time is long, and it is difficult to meet the technical problems of applications such as optical storage

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  • A device and method for reducing the number of pulses required for introducing a femtosecond laser into a structure

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[0027] In order to make the objectives, technical solutions and advantages of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely intended to illustrate the invention and are not intended to limit the invention. Further, the technical features according to each of the various embodiments described below can be combined with each other as long as they do not constitute a collision between each other.

[0028] Studies have shown that nano gratings need to undergo a hatching process. Since there are some inherent defects in the molten quartz, the femtosecond laser acts to the processing area, these defects have a lower ionization threshold, producing some random distributed nano-plasma exclusions in the processing area. Under subsequent laser pulses, these nano-plasma motions are constantly expanded, and the exp...

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Abstract

The invention discloses a device and a method for reducing the number of pulses required for introducing a femtosecond laser into a structure, and belongs to the field of laser processing. The method comprises: generating a first femtosecond laser pulse and a second femtosecond laser pulse; modulating the delay time of the first femtosecond laser pulse and the second femtosecond laser pulse so that the second femtosecond laser pulse lags behind The first femtosecond laser pulse is in the range of 0-150 femtoseconds; the first femtosecond laser pulse and the second femtosecond laser pulse are focused on the processing area inside the processing material to form an anisotropic structure; wherein, the first A femtosecond laser pulse is used to generate nanoplasmons in the material; a second femtosecond laser pulse is used to accelerate the asymmetric growth process of nanoplasmons. The invention effectively reduces the number of pulses required for generating the nano-grating structure, improves the generating speed of the nano-grating structure, and can meet applications with high speed requirements such as optical storage.

Description

Technical field [0001] The present invention belongs to the field of laser processing, and more particularly to a device and method for reducing the number of pulses required for femtosecond laser introduction structure. Background technique [0002] In recent years, femtosecond lasers and their applications have been greatly developed and have received more and more attention. Due to its extremely high instantaneous power density, a nonlinear effect such as multi-photonic absorption or multi-photon polymerization can be achieved inside the transparent material after the focus is focused, and the rapid development is obtained in the field of micro-nano manufacturing. Molten Stone is a common material commonly used in femtosecond laser processing, depending on the difference in laser pulse energy, the molten quartz can induce three different types of structural changes. When the pulse energy is low, the refractive index of the processing area increases and can be used to make the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/06B23K26/0622B23K26/70
CPCB23K26/0643B23K26/0622B23K26/702
Inventor 张静宇高骥超刘思垣
Owner HUAZHONG UNIV OF SCI & TECH
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