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Method and device for realizing Raman laser source used for pyrene fluorescence spectrum detection

A technology of Raman laser and fluorescence spectroscopy, which is applied in the field of Raman laser source realization devices, can solve the problems of output light intensity, high requirements for detection units, inconvenient online detection, etc., and achieve stable central wavelength of output laser and improve Detection accuracy, stable and reliable effect of the system

Inactive Publication Date: 2012-07-04
MACAU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method is simple, the disadvantage is that the light intensity of the output light is very weak, which requires high requirements for the subsequent detection unit
In addition, this method generally requires sampling, which is placed in a spectrometer or spectrophotometer for detection, which is not convenient for online detection, which limits its scope of application
[0005] Ultraviolet tunable lasers can obtain a strong output laser, but the price is high, so it is not suitable for popularization, and if dye tunable lasers are used, the carcinogenic dyes are easy to cause harm to the body of experimenters

Method used

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  • Method and device for realizing Raman laser source used for pyrene fluorescence spectrum detection
  • Method and device for realizing Raman laser source used for pyrene fluorescence spectrum detection
  • Method and device for realizing Raman laser source used for pyrene fluorescence spectrum detection

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Embodiment 1

[0034] Embodiment 1 is used for the realization device of the vibration Raman laser source of pyrene fluorescence spectrum detection

[0035] see figure 2 , is the schematic diagram of the implementation device of the vibration Raman laser source used for pyrene fluorescence spectrum detection in the present invention, including Nd:YAG pulsed laser 1, double frequency crystal 2, quadruple frequency crystal 3, optical filter 4, Raman cell 5, prism 6, diaphragm 7, microscopic objective lens 8 and optical fiber 9, the windows at both ends of the Raman cell 4 are equipped with convex lenses 10, which are filled with high-voltage H 2 .

[0036] In this embodiment, the optical filter 4 is two pieces, and they are placed in parallel. The optical filter 4 is highly transparent to 45° incident wavelengths of 1064nm and 532nm lasers, and highly transparent to 45° incident 266nm quadruple frequency lasers. opposite.

[0037] The convex lenses 10 mounted on the windows at both ends of...

Embodiment 2

[0038] Embodiment 2 is used for the realization device of the vibration Raman laser source of pyrene fluorescence spectrum detection

[0039] The implementation device utilizing the vibrational Raman laser source for pyrene fluorescence spectrum detection in embodiment 1 is used for pyrene fluorescence spectrum detection, comprising the following steps:

[0040] 1) Turn on the Nd:YAG pulsed laser 1, and the output wavelength is a fundamental frequency laser with a wavelength of 1064nm;

[0041] 2) The fundamental frequency laser passes through the double frequency crystal 2, the quadruple frequency crystal 3 and the optical filter 4 to filter out the 1064nm and 532nm wavelength lasers to obtain a pure 266nm quadruple frequency laser;

[0042] 3) The pure 266nm quadruple frequency laser is incident on the Raman cell 5 to generate vibrational Raman scattered light of different orders; adjust the prism 6 at the exit end of the Raman cell 5 to make the vibrational Raman scattered ...

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Abstract

The invention discloses a method and a device for realizing a Raman laser source used for pyrene fluorescence spectrum detection. Hybrid lasers with wavelengths being 1064nm, 532nm and 266nm are obtained by processing fundamental frequency light being 1064nm, generated by a Nd:YAG pulse laser, through a frequency doubling crystal and a frequency quadrupling crystal. The hybrid lasers with the wave lengths being 1064nm and 532nm are filtered by an optical filter, so that a pure quadruple-frequency laser being 266nm in the linear polarization state is obtained. The quadruple-frequency laser being 266nm in the linear polarization state is focused by a lens and then pumped in a Raman tank filled with high-pressure H2 so as to make the quadruple-frequency laser subjected to vibration simulated Raman scattering, the scattered laser with hybrid wavelengths is split by a triangular prism and selected by a diaphragm, so that the purified laser with wavelength being 239.6nm of a H2 first-stage anti-stokes light, namely the laser source for pyrene fluorescence spectrum detection, is obtained. The laser with the wavelength is strong in light intensity, stable in central wavelength, and narrow in line width, and completely meets the requirement for the pyrene fluorescence spectrum detection. The system device is stable and reliable in performance and low in cost.

Description

technical field [0001] The invention relates to a method for realizing a Raman laser source used for pyrene fluorescence spectrum detection, and the invention also relates to a device for realizing the Raman laser source used for pyrene fluorescence spectrum detection. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are hydrocarbons containing two or more benzene rings in their molecules, including more than 150 compounds such as naphthalene, anthracene, phenanthrene, and pyrene, and their pollution sources include natural sources and man-made sources. Natural sources are mainly pollution formed by natural factors such as volcanic eruptions, forest fires and biosynthesis. Anthropogenic sources include various fossil fuels (such as coal, oil, natural gas, etc.), wood, paper, and other toxic substance pollution formed by incomplete combustion or pyrolysis in a reduced state. PAHs in the atmosphere, water and soil can contaminate food, fruits and vegetabl...

Claims

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Application Information

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IPC IPC(8): H01S3/108H01S3/00
Inventor 李建庆徐贲冯丽潘媛媛杨喆
Owner MACAU UNIV OF SCI & TECH