Apparatus and method for measuring spectral components of Raman scattered light

Abstract

An apparatus for measuring a spectral component of Raman scattered light emitted by a target is disclosed. The device comprises: a pulse laser light source for emitting light; the detection optical device is used for guiding the light to a target and collecting the light scattered by the target; a spectrometer comprising: an input splitter for splitting the collected light into a first light beam and a second light beam; a first spectrometer comprising an input aperture for receiving the light beam and a light disperser for dispersing the light beam; a second spectrometer including an input aperture and an output aperture; and a spatial light modulator for receiving the dispersed first and second light beams and selectively providing at least a portion of at least one of the dispersed first and second light beams to an input aperture of a second spectrometer, the second spectrometer reversing the dispersion of the light beams and focusing the light beams to an output aperture; a detector element is used to measure a spectral component of the light beam exiting the output aperture. The spectrometer also includes a delay line for delaying the light beam.

Description

technical field [0001] The present disclosure relates to apparatus for measuring spectral components of Raman scattered light emitted by a target. Furthermore, the present disclosure relates to methods for measuring spectral components of Raman scattered light emitted by a target. Background technique [0002] Raman spectroscopy has gained popularity over the past few decades as a widely used spectroscopic method to characterize and identify target materials, or to distinguish target materials from other materials. Raman spectroscopy is widely used in various fields such as art and archaeology, chemistry (organic and inorganic materials), geology, life sciences, pharmaceuticals, semiconductors, etc. Typically, Raman spectroscopy is based on the interaction of light with chemical bonds within the target material. From the interactions, Raman spectra are generated, which provide a unique chemical fingerprint (including information about chemical structure, phase, polymorphis...

AI Technical Summary

Problems solved by technology

This is because in this spectrometer, the different wavelengths cannot be focused exactly to the same point

Third, existing SLM-based spectrometers with two spectrometers typically have a single channel for light propagation and are not well suited to obtain the optimal combination of wavelength resolution, spectral range, and large throughput

Furthermore, such spectrometers are also inefficient in reducing stray light and maximizing the dynamic range of individual pulses (i.e., maximum SPAD counts per individual laser pulse)

Furthermore, existing techniques and equipment for Raman spectroscopy are poorly suited to detect the weak Raman signal combined with strong and short-lived photoluminescence

This leads to inaccuracies in measuring the spectral components of such Raman signals

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