Method for enhancing laser-induced breakdown spectroscopy intensity

Abstract

The invention provides a method for enhancing laser-induced breakdown spectroscopy intensity, particularly relates to a method for promoting the absorption of a thermoelectric-medium-resistant material on femtosecond laser by using gold nanoparticles and further improving the plasma radiation spectroscopy intensity, and belongs to the technical field of femtosecond laser application. A layer of gold nanoparticle covers the surface of the thermoelectric-medium-resistant material by a hot dehumidifying method; in a region of focusing the femtosecond laser onto the surface of the material through a planoconvex lens, the material local electromagnetic field intensity is obviously enhanced due to the effect of plasma elements, so that the absorption mechanism of the thermoelectric-medium-resistant material on the femtosecond laser is changed; the volume of the plasma and the radiation spectroscopy intensity are finally improved. Under the condition of the same laser flux, the intensity of spectral lines is several times higher than that of the conventional femtosecond laser.

Description

technical field [0001] The invention relates to a method for enhancing the intensity of laser-induced breakdown spectrum, in particular to a method for using gold nanoparticles to promote the absorption of femtosecond laser by heat-resistant dielectric materials, thereby increasing the intensity of plasma radiation spectrum, which belongs to the application of femtosecond laser technology field. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS for short) is an elemental analysis technique that uses a focusing lens to focus a pulsed laser, then excites a small amount of sample to generate plasma, and finally uses a spectrometer to analyze the resulting plasma. The spectral signals of different elements can be analyzed according to the characteristic spectrum. Because LIBS technology can basically analyze any element in any state, and can realize non-destructive testing and other advantages, LIBS technology has been widely used in fields such as minera...

AI Technical Summary

Problems solved by technology

However, compared with other analytical techniques, common LIBS technology has two major disadvantages: low analytical precision and poor repeatability

[0003] The above methods have their own disadvantages, such as the complex experimental optical path of the double-pulse method, and the need for additional equipment for EDM assistance, etc.

Patent CN105067572A discloses a method and device for enhancing laser-induced breakdown spectrum, which uses microwaves generated by a microwave generator to heat plasma to achieve spectral signal enhancement, but the experimental equipment for this method is relatively complicated; patent CN105067571A discloses a A device for enhancing the laser-induced breakdown spectrum. This invention enhances the spectral signal by changing the background gas and converging the plasma radiation with other devices, but the method is also complicated.

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