Dual-element common-substrate Raman probe

Abstract

The invention relates to a dual-element common-substrate Raman probe. The Raman probe comprises a first lens, an optical filter, a reflecting mirror, a color selective mirror, a second lens, a third lens and a fourth lens. Excited light enters the probe from an input optical fiber, and is collimated into parallel light by the first lens. Then, out-of-band stray light is filtered out through the optical filter, and the filtered light reaches the second lens after being reflected twice by the reflecting mirror and the color selective mirror. Then, the focus is converged to a sample under test through the second lens, and Raman scattering light and other scattering light generated by the sample under test are collected and collimated together into parallel light through the third lens. Rayleigh scattering light is filtered out through the color selective mirror, and finally enters the input optical fiber after being converged by the fourth lens. Through a dual-element common-substrate design, the number of components is reduced, and the system structure is simplified. Through coaxial design of the excited light and collected light, the system aberration is reduced, and the Raman scattering light collection efficiency is improved greatly compared with other Raman probe designs with the same aperture.

Description

technical field [0001] The invention relates to the field of optical instruments, in particular to a dual-element co-substrate Raman probe for a small Raman spectrometer. Background technique [0002] Raman spectroscopy is a kind of scattering spectrum. Raman spectroscopy is based on the Raman scattering effect discovered by Indian scientist Raman. It analyzes the scattering spectra of different frequencies of incident light to obtain information on molecular vibration and rotation, and applies An analytical method for the study of molecular structures. [0003] Because the frequency change of Raman scattered light depends on the characteristics of the scattering material itself, the vibration mode of its constituent molecules is unique, and Raman scattered light with a specific frequency difference can be generated to form a distinctive "fingerprint spectrum". Mann scattering spectrum information can reflect the composition and molecular structure of substances, and has hi...

AI Technical Summary

Problems solved by technology

At present, commercial Raman probes are mainly used in the industrial field. They are usually large in size and can only be used to detect the surface of samples. There are also reports on the application of small Raman probes, but the efficiency of collecting Raman signals is extremely low, which limits Promotion of its application

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