The modular system for Raman spectroscopy from Ocean Optics offers a high degree of flexibility not only in the choice of the optimal layout, but also in the possible reconfiguration of the set-up. The individual components (laser source, Raman probe, spectrometer, sample holder) can be selected to best suit the application.
The modular Raman spectrometer most commonly uses one of the high-sensitivity fiber spectrometers(QE Pro, Ocean HDX or Maya). A popular choice for the near-infrared region tends to be the NIRQuest.
Raman spectroscopy requires laser sources with spectral purity of output and high stability. The correct choice of laser wavelength depends on the material being studied. 532 nm, 638 nm, 785 nm and 1064 nm are available.
The special Raman probe has a dual role, firstly it delivers laser radiation to the sample to excite Raman scattering and secondly it ensures the transmission of the scattered radiation through the sample to the spectrometer. The individual probes are always designed for a specific wavelength (532, 638, 785 or 1064 nm) and differ in the type of connectors used.
Ocean Optics offers several sample holders for use in Raman analysis of liquids and solids. Multi-purpose holders are also available that can be used not only for Raman scattering but also for fluorescence, absorbance and reflectance measurements.
Surface-enhanced Raman spectroscopy (SERS) is a very promising and extremely sensitive analytical method. Prior to the actual analysis, the measured sample is absorbed by a noble metal substrate. A combination of chemical and electromagnetic effects then amplifies the intensity of the Raman signal. Ocean Optics' affordable gold and silver SERS substrates provide exceptional stability, high sensitivity and excellent repeatability.
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| Raman-532 | Raman-638 | Raman-785 | Raman-1064 | |
| Laser | 532 nm, power > 50 mW | 638 nm, power > 50 mW | 785 nm, power tunable to > 350 mW | 1064 nm, power tunable to > 500 mW |
| Spectrometer | QE Pro-Raman-532, H6 grating, 25 µm slit | QE Pro-Raman-638, H6 grating, 25 µm slit | QE Pro-Raman+, 50 µm slit | NIRQuest512-1.9, NIR10 grating, 50 µm slit |
| Spectral range | 532 to ~700nm | 638 to ~799nm | 785 to ~1030nm | 1060 to ~1446nm |
| Spectral resolution (FWHM) | ~0.42 nm | ~0.42 nm | ~0.72 nm | ~1.73 nm |
| Range | 150-4000 cm-1 | 150-3150 cm-1 | 150-3000 cm-1 | 150-2480 cm-1 |
For 785 nm, the more affordable Ocean HDX-Raman7 spectrometer is often used.
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