Laser breakdown spectra measuring system based on beam shaping

A laser breakdown spectrum and beam shaping technology, applied in the field of laser breakdown spectrum measurement system, can solve the problem of energy difference between the center and edge of the plasma

Inactive Publication Date: 2018-12-18
TSINGHUA UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a laser breakdown spectrum measurement system based on beam shaping, which aims to overcome the problem that the energy distribution of the laser profile is too concentrated and the energy received by the

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  • Laser breakdown spectra measuring system based on beam shaping
  • Laser breakdown spectra measuring system based on beam shaping
  • Laser breakdown spectra measuring system based on beam shaping

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Embodiment 1

[0019] Taking the aluminum alloy sample as an example, the LIBS experiment is carried out on the aluminum alloy sample. The pulse laser used in the experiment is an ND:YAG solid-state laser with a laser wavelength of 1064nm. The pulse laser can emit pulse laser. The total energy of each pulse laser is 50mJ. The pulse width of the pulse is 10 ns. The laser spot before shaping is circular, and the energy density is higher at the center of the spot and lower at the edge. The programmable beam shaper changes the shape of the laser beam profile from a Gaussian distribution to the following distribution: the shape of the shaped laser profile is still circular, the center of the profile has almost the same energy density, and the laser energy at the edge is slightly higher than the center. Focus the laser on the surface of the sample and ablate the sample, generate plasma and analyze the spectral lines.

[0020] In this case, under the conditions of not using the beam shaper and usi...

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Abstract

A laser breakdown spectra measuring system based on beam shaping comprises a pulsed laser, a focusing lens, a sample to be tested, a probe, an optical fiber, a spectrometer, a computer, an ICCD camera, and a programmable beam shaper, wherein the beam shaper is disposed between the pulsed laser and the focusing lens; a laser beam is irradiated onto the sample through the programmable beam shaper and the focusing lens to generate a plasma, the plasma spatial intensity distribution is acquired by the ICCD camera, and the beam spatial intensity distribution is continuously changed by adjusting theprogram of the programmable beam shaper to make the plasma spatial intensity distribution collected by the ICCD camera appear to be evenly distributed. At this time, the amount of ablation of the sample to be tested by the laser and the stability of the plasma spectrum are both improved. The laser breakdown spectra measuring system can make the laser ablate the sample more effectively and uniformly, thereby reducing the internal fluctuation of the plasma, and having great significance for improving the repeatability and accuracy of the LIBS technology measurement.

Description

technical field [0001] The invention relates to a laser breakdown spectrum measurement system, in particular to a laser breakdown spectrum measurement system based on beam shaping, and belongs to the field of laser-induced breakdown spectrum technology and measurement technology. Background technique [0002] Laser-induced breakdown spectroscopy is a new type of atomic emission spectroscopy. Laser breakdown spectroscopy (LIBS) systems mainly include pulsed lasers, spectrometers and other equipment. The basic technical principle is: use a beam of high-energy laser pulses as The excitation source, the laser is focused on the surface of the sample to form a spot with high energy density, so that the sample is gasified in a short time and generates plasma. The temperature of the plasma is very high, and the atoms and ions in the high energy level It will spontaneously transition to a lower energy level and release photons of a specific frequency. The spectrum can be obtained by ...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N21/71
CPCG01N21/71G01N21/73
Inventor 王哲侯宗余李天奇傅杨挺俞建龙顾炜伦
Owner TSINGHUA UNIV
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