Laser and substance action enhancing method based on plasma absorption enhancement

Abstract

The invention discloses a laser and substance action enhancing method based on plasma absorption enhancement, which comprises the following steps: irradiating the surface of a substance by using combined repetition frequency pulse laser comprising a pulse substrate and a pulse peak, and exciting plasma through the pulse peak; and injecting energy into the plasma through the pulse substrate, serving the plasma as a secondary heat source to change temperature distribution and stress distribution on the surface of a substance, increasing temperature gradient distribution and thermal stress on the surface of the substance, and enhancing the damage effect of laser on the substance. According to the laser and substance action enhancing method based on plasma absorption enhancement, the combined repetition frequency pulse laser acts on the surface of the substance, a specific amount of plasma can be excited, the plasma absorption enhancing effect is caused, temperature gradient distribution and thermal stress of the surface of the substance are increased, efficient laser and substance action is achieved, and the effect of quickly damaging the surface of the substance is achieved. The method has important significance on development of the fields of laser processing, laser military application and the like.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a method for enhancing the interaction between laser and matter based on plasma absorption enhancement. Background technique [0002] Under the action of laser irradiation, the laser energy is absorbed by the substance, and the temperature of the surface of the substance will continue to rise. With the continuous increase of the irradiation intensity and the action time, the material begins to undergo a phase change or even be ionized. The resulting temperature and the dynamic change law of the ablation morphology are one of the key issues in the study of the interaction between laser and matter. The research on substance absorption, shape change and damage effect of materials will be of great significance to the development of laser processing, laser military application and other fields. [0003] Laser can be divided into continuous laser, long-pulse laser and short-pulse laser...

AI Technical Summary

Problems solved by technology

However, the above-mentioned laser still has problems such as poor damage effect when irradiating the surface of the material.

For continuous laser and long pulse laser, the peak power is insufficient, the whole action process is mainly to heat the material, and the effect on material damage is poor; although the peak power of pulse laser is very high, it is easy to cause initial damage to the material surface, but it produces a large amount of plasma Experience the absorption of subsequent lasers, resulting in the laser being unable to continue to act on the surface of the material, causing further damage to the material to deteriorate. In addition, the high-power pulsed laser system is complicated, and the laser is not conducive to long-distance transmission

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