Ventus 532 for Raman Spectroscopy

The ventus 532 is built for Raman spectroscopy applications, with an M2 close to unity allowing for a tighter focal point hence a higher intensity. Raman spectroscopy is a weak process, so you need a high intensity IR necessary to obtain a good signal​. The tight focal point is also important for spatial resolution. If you want to look at a small area/volume of a sample, you need to focus the laser to a small spot (which requires an M2 close to 1).

The ventus has a leading noise specification of <0.15% RMS, enabling a stable and consistent result in Raman spectrum: due to the weak scattering process, you want a laser that is consistent in power. As is common in Raman, customers take multiple spectra and average these, so you need your laser to be as stable as possible to make these consistent measurements, as any changes in the noise is ‘passed’ on to the final Raman spectrum​, the ventus sizably reducing this risk with its low noise.

During Raman spectroscopy, having the flexibility to couple to a microscope offers ease of integration as your laser can be placed anywhere in the lab and the ventus can be free spaced coupled to a microscope. And finally, the ventus has a wavelength of 532.8 nm better than ±1 nm, making it easy to find filters to suit your set-up.

If you are involved in Raman spectroscopy and want to find out more, contact us below!

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About Raman Spectroscopy

Raman spectroscopy is used in two techniques to scan the sample – point Raman, where the laser beam could either be incident on the sample on a single focus point or as a line. Line Raman technique increases throughput (and speed) but requires higher power from the lasers. Both methods can be applied in in-line applications. Raman spectroscopy relies on spectral bandwidth (resolution is an effect of spectral bandwidth, narrow bandwidth = higher resolution), power stability, and wavelength stability. Optics typically limit the laser wavelength to either 532 or 785 nm. Meeting the optimal specifications of these will give a clear reading of the chemical make-up of what is being tested.