Raman spectroscopy
Why Ibsen Photonics for Raman
Raman spectroscopy measures Stokes and anti-Stokes scattering from laser excited materials to determine their molecular composition. This scattering is very weak, requiring extremely sensitive Raman spectrometers, making every photon count.
Ibsen Photonics manufactures Raman transmission gratings with best-in-class polarization independent diffraction efficiencies and high grating dispersion, enabling high resolution in compact, cost effective designs.
Combined with spectrometer designs for volume manufacturing with low unit-to-unit variation and high environmental stability, Raman spectrometers are ideal for integration in high performance systems at a competitive cost.
Ibsen Photonics makes a difference in your Raman system:
Advantages of using Ibsen Photonics for Raman
Our spectrometer and in-house manufactured transmission gratings provide unparalleled sensitivity and a best-in-class optical design optimized for throughput and resolution. Our Raman transmission gratings offer high and even broadband diffraction efficiencies for both polarizations.
Our experienced R&D teams have over 200 years of combined tenure and experience optimizing grating and spectrometer designs to achieve the best possible performance, cost, and size-effective platforms.
These factors yield the following benefits:
L-cystine measured with a EAGLE Raman-S configured for anti-Stokes.
Transmission gratings for Raman
At Ibsen Photonics, we design and manufacture best-in-class surface relief transmission gratings in fused silica for wavelengths between 175 nm and 2,500 nm. Our optimized Raman gratings provide absolute diffraction efficiencies above 80% over a broad wavelength range in both TM and TE polarization, which is optimal for detecting all vibrational modes.
The high dispersion efficiency enables more compact spectrometer designs with high throughput. The DE for our 785 nm Raman grating is shown in the figure.
Spectrometers for Raman
Our Raman spectrometers are optimized for different applications, from our highest performing Raman-S design to our flexible Raman-HR design and our most cost effective Freedom Mini-Raman.
The first figure (top) shows the relative sensitivity achieved with our different Raman spectrometers for the same resolution of 0.6 nm compared to Freedom Mini-Raman. Better resolutions can be achieved via smaller slits at the cost of reduced sensitivity.
The Raman spectra in the figure (bottom) were collected for OTC paracetamol using a 785 nm 500 mW laser, a probe with an OD6 LP filter, a 66 µm spot size, and an exposure time of 500 ms. The high quality Raman spectra are an impressive achievement for such compact designs and result from the high dispersion and diffraction efficiency of our gratings. Furthermore, it shows that in some cases, if the sensitivity is good enough, detector cooling may not be necessary.
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