Single-grating Raman spectrum testing system for measuring low-wave-number Raman signals

Abstract

The invention discloses a single-grating Raman spectrum testing system for measuring low-wave-number Raman signals. The system comprises a laser source, a volume grating bandpass filter, a beam splitter, a microscope objective, three volume grating notch fibers, a focusing lens and a single-grating spectrometer, wherein the volume grating bandpass filter is positioned on a laser optical path, and is used for filtering plasma lines of laser light and purifying laser lines; the beam splitter is positioned on the light path of laser light reflected by the volume grating bandpass filter, and is used for reflecting the laser light purified by the volume grating bandpass filer onto the microscope objective; the microscope objective is used for focusing the laser light onto a sample for exciting Raman spectrum signals; the three volume grating notch fibers are arranged in sequence, and are positioned on a light path on which sample Raman signal light is collected by using microscope objective and passes through the beam splitter; the focusing lens is used for converging the Raman signals into the inlet of the single-grating spectrometer; and the single-grating spectrometer comprises a detector, and is used for collecting Raman signals. The system can be used for detecting Raman spectrum signals of which the wave numbers are as small as 5, so that a microscopic Raman spectrometer has remarkable advantage on the aspect of measuring low-wave-number Raman spectrums than an infrared spectrometer.

Description

technical field [0001] The invention relates to the technical field of Raman spectroscopy testing, in particular to a single-grating Raman spectroscopy testing system for measuring low-wavenumber Raman signals, which can be used in ultra-low frequency Raman spectroscopy. Background technique [0002] As we all know, with the development of modern technology, various filters for Raman spectroscopy have emerged. These filters eliminate the need for several monochromators to filter the excitation light, allowing the Raman spectrometer to be very compact. So far, single-grating Raman spectrometers using notch filters and sideband filters have dominated the major Raman spectrometer market. Here, the notch filter and the sideband filter not only play the role of reflecting the excitation light to the sample, but also play the role of filtering the Rayleigh line in the scattered signal. [0003] In the measurement of Raman spectroscopy, people often hope to obtain low-wavenumber ...

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Problems solved by technology

Since the intensity of many low-wavenumber Raman signals is very weak, it brings great difficulties to extensively study the low-wavenumber Raman signals of various measurements

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