Systems and methods for high resolution spatial heterodyne raman spectroscopy
The present subject matter is directed to a device for spectroscopy. The device includes an excitation source and a first spatial heterodyne spectrometer configured to receive wavelengths from the excitation source and filter the wavelengths to produce fringes on a sample. The device also includes a second heterodyne spectrometer configured to receive Raman wavelengths from the sample.
1. A device comprising:
an excitation source;
a first spatial heterodyne spectrometer configured to receive wavelengths from the excitation source and filter the wavelengths to produce fringes on a sample;
a second spatial heterodyne spectrometer configured to receive Raman wavelengths from the sample.
2. The device of claim 1 , wherein the excitation source is a light emitting diode.
3. The device of claim 1 , further comprising one or more band pass filters, the one or more band pass filters being configured to remove light outside of the Raman wavelengths.
4. The device of claim 1 , further comprising one or more blocking filters.
5. The device of claim 1 , further comprising a charge coupled device or intensified charge coupled device configured to collect Raman wavelengths.
6. The device of claim 1 , wherein the first spatial heterodyne spectrometer further comprises a diffraction grating or dispersive prism, the grating or prism configured to adjust the wavelengths.
7. The device of claim 6 , wherein the grating angle can be adjusted.
8. The device of claim 7 , wherein the first spatial heterodyne spectrometer comprises one or more simple wedge prisms to further increase the acceptance angle.
9. A method for spectroscopy comprising:
producing fringes on a sample with a first spatial heterodyne spectrometer, the first spatial heterodyne spectrometer receiving wavelengths from an excitation source and filter the wavelengths to produce the fringes on the sample; and
utilizing a second spatial heterodyne spectrometer to receive Raman wavelengths from the sample.
10. The method of claim 9 , further comprising one or more band pass filters, the one or more band pass filters removing light outside the Raman wavelengths.
11. The method of claim 9 , further comprising one or more detectors, the one or more detectors detecting ambient light, vibrational instabilities, or combinations thereof.
12. The method of claim 9 , wherein the spatial heterodyne spectrometer further comprises a diffraction grating or prism, the grating or prism being moved to adjust the wavelengths.
13. The method of claim 9 , further comprising utilizing the second spatial heterodyne spectrometer to perform time-resolved Raman spectroscopy.
14. The method of claim 9 , wherein the excitation source is a light emitting diode.
15. The method of claim 9 , wherein Stokes and anti-Stokes Raman wavelengths are measured simultaneously.
16. The method of claim 9 , further comprising determining the sample temperature.
17. The method of claim 9 , wherein the sample comprises biomarker, mineral, rock, ice, light sensitive material, or combinations thereof.
18. The method of claim 9 , wherein the sample comprises a high explosive.
19. The method of claim 9 , wherein the second spatial heterodyne spectrometer is configured as a microRaman device for point measurements or imaging to produce chemical maps.
20. The method of claim 9 , wherein the second spatial heterodyne spectrometer is configured as an in-situ chemical sensor to obtain chemical information that is capable of being utilized for chemical reaction control or additive manufacturing.
21. The method of claim 9 , wherein the second spatial heterodyne spectrometer is utilized to perform analysis on multiple spectroscopies.