Device and method for increasing breakdown point distance of laser-induced air breakdown

A technology of laser induction and breakdown point, which is applied in the field of laser spectroscopy, can solve the problems of restricting the development of remote detection technology and the reduction of laser light intensity

Active Publication Date: 2016-12-07
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The traditional air laser-induced breakdown spectroscopy technology uses a single beam of nanosecond laser to focus into the air to form a breakdown spectrum, but as the focal length of the focusing lens increases, that is, the distance from the breakdown point increases, the laser light intensity at the focus decreases , until the plasma cannot be formed in the air, which limits the development of remote detection technology in the air

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  • Device and method for increasing breakdown point distance of laser-induced air breakdown

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0016] see first figure 1 , the optical path diagram for the specific implementation of improving the working distance of laser-induced breakdown spectroscopy. As shown in the figure, the central wavelength of the femtosecond laser pulse emitted by the femtosecond laser 1 is 800nm, the pulse width is about 40fs, and the repetition frequency is 1kHz; the central wavelength of the nanosecond laser pulse emitted by the nanosecond laser 4 is 10.6μm, and the pulse width is about It is 120ns and the repetition rate is 10Hz. The trigger output signal of the femtosecond laser 1 is connected to the input end of the delay controller 2 , and the output end of the delay controller 2 is connected to the trigger input end of the nanosecond laser 4 . The femtosecond laser 1 and the nano...

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Abstract

The invention relates to a device and method for increasing breakdown point distance of laser-induced air breakdown. The method includes: using a beam combiner to combine a femtosecond laser pulse and a nanosecond laser pulse, regulating the time delay between the femtosecond laser pulse and the nanosecond laser pulse to allow the femtosecond laser pulse to be a certain time ahead of the nanosecond laser pulse, and using a concave reflecting mirror to focus the femtosecond laser pulse and the nanosecond laser pulse in the air to generate induced breakdown. Compared with common laser-induced breakdown, the method has the advantages that the femtosecond laser pulse is focused in advance to form preionization in the air, generated electrons lower the breakdown threshold of the nanosecond laser pulse in the air to allow the breakdown point of the induced breakdown generated by the nanosecond laser pulse to be farther than breakdown point of a traditional method, and the farther breakdown point lays a foundation for the development of remote atmospheric sounding technology, and the method is significant to the remote detection of the gas components and content in an atmospheric environment.

Description

technical field [0001] The invention relates to the technical field of laser spectroscopy, in particular to a device and method for increasing the distance of a breakdown point of laser-induced air breakdown, which is of great significance for remote detection of the atmospheric environment. Background technique [0002] Laser-induced breakdown spectroscopy in air is an advanced spectral detection technology. Its specific principle is: use high-energy pulsed laser to focus into the air to form high-temperature, high-density plasma, and measure the emission spectrum of plasma atoms and molecules The wavelength and intensity of the spectral lines in the air can be used to qualitatively and quantitatively analyze the chemical elements contained in the air. Due to many advantages such as high sensitivity and long-range characteristics, laser-induced breakdown spectroscopy has become an important tool for studying the interaction between laser and gas substances. [0003] The tr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 李紫婷储蔚曾斌姚金平谢红强李贵花程亚
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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