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

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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