Raman spectrum liquid detection method based on frequency doubling and hollow-core optical fiber in linear cavity

A hollow-core fiber, detection method technology, applied in Raman scattering, material excitation analysis and other directions, can solve the problems of insufficient sensitivity, focusing on the glass slide, optical path adjustment and system stability requirements, etc., to achieve high detection efficiency, The effect of few longitudinal molds and compact structure

Active Publication Date: 2017-02-01
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

[0003] However, Raman scattering is a kind of weak scattering, and there is a problem of insufficient sensitivity in practical operation. At present, it is more typical to adopt the method of multi-reflection enhancement. Although the multi-reflection cavity can greatly improve the Raman scattering intensity

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  • Raman spectrum liquid detection method based on frequency doubling and hollow-core optical fiber in linear cavity
  • Raman spectrum liquid detection method based on frequency doubling and hollow-core optical fiber in linear cavity
  • Raman spectrum liquid detection method based on frequency doubling and hollow-core optical fiber in linear cavity

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[0025] The objects and functions of the present invention and methods for achieving the objects and functions will be clarified by referring to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of the description is only to help those skilled in the relevant art comprehensively understand the specific details of the present invention.

[0026] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0027] figure 1 and figure 2 A system composition diagram 100 and a step flow chart 200 of the Raman spectroscopy liquid detection method based on linear intracavity frequency doubling and hollow-core fiber according to the present invention are respectively shown. The system compositio...

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Abstract

The invention provides a Raman spectrum liquid detection method based on frequency doubling and hollow-core optical fiber in a linear cavity. The method comprises the steps that a continuous laser with the wavelength being 915 nanometers or 976 nanometers is used as a light source, a linear resonant cavity formed by a fiber bragg grating and an optical fiber total-reflection mirror is adopted, narrow-linewidth 532 nano laser is obtained through an active optical fiber and a lithium boric oxide frequency doubling crystal, and to-be-detected liquid is excited to generate Raman scattering light; meanwhile, the liquid detection method has the advantages of adopting few longitudinal modes, being good in coherence, compact in structure, high in detection efficiency and reliability and the like.

Description

technical field [0001] The invention relates to a Raman spectrum detection method, in particular to a Raman spectrum liquid detection method based on frequency doubling in a linear cavity and a hollow-core optical fiber. Background technique [0002] Raman spectroscopy is an analytical method to study the relationship between the scattering of compound molecules after being irradiated by light, the energy level difference between scattered light and incident light, and the vibration frequency and rotational frequency of compounds. Similar to infrared spectroscopy, Raman spectroscopy is a vibrational spectroscopy technique. The difference is that the former is related to the change of the dipole moment when the molecule vibrates, while the Raman effect is the result of the change of the polarizability of the molecule, and what is measured is the inelastic scattered radiation. In terms of liquid detection, Raman spectroscopy has technical advantages such as short analysis per...

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 张雯祝连庆姚齐峰董明利娄小平何巍李红
Owner BEIJING INFORMATION SCI & TECH UNIV
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