Microscopic confocal Raman spectrometer

Abstract

The invention discloses a microscopic confocal Raman spectrometer, comprising a microscopic confocal Raman module and a single-grating spectrometer which is matched with the microscopic confocal Raman module, wherein the microscopic confocal Raman module comprises a reflecting mirror, an angle-adjustable optical filter bracket, a sample monitoring optical path, a Raman optical filter, a microscopic objective lens, a collecting lens and a size-adjustable pinhole. Laser is focused to a sample by using the microscopic confocal Raman module, so that the sample and the corresponding laser spots are observed microscopically, and a Raman signal is microscopically confocal to the size-adjustable pinhole simultaneously, therefore the Raman signal is detected by using the single-grating spectrometer. The invention provides a novel microscopic confocal Raman spectrometer with the characteristics of simpleness, economy and convenience for adjustment, so that the microscopic observation of the sample and the corresponding laser spots can be achieved, besides, the microscopic confocal Raman spectrometer plays a potential role on Raman spectrum measurement of materials.

Description

technical field [0001] The invention relates to the technical field of Raman spectrum testing, in particular to a microscopic confocal Raman spectrometer, which can be used for real-time observation of samples and low-cost confocal microscopic testing of Raman spectrum. Background technique [0002] As we all know, with the development of modern technology, various filters for Raman spectroscopy have emerged. These filters make Raman spectrometers simpler by eliminating the need for multiple monochromators to filter the excitation light. So far, microscopic single-grating Raman spectrometers using notch filters and sideband filters have dominated the major Raman spectrometer market. At the same time, in order to improve the signal-to-noise ratio of Raman signals, micro-Raman spectrometers generally use confocal technology. Many Raman spectrometers on the market now integrate lasers, microscopes, confocal pinholes, gratings and detectors. figure 1 shown. In these commerci...

AI Technical Summary

Problems solved by technology

However, these single-grating spectrometers are rarely used to study Raman spectroscopy. The main reason is that the Raman signal is very weak, and microscopic techniques are needed to increase the optical power density of the excitation light, and at the same time improve the collection efficiency and the efficiency of the Raman signal light. SNR

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