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:

  • Best-in-class grating efficiency

  • Maximum sensitivity and signal-to-noise ratio

  • High resolution in compact designs

  • Environmentally stable designs

  • Low unit-to-unit variation for easy OEM integration

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:

  • Maximum sensitivity provided by high grating efficiency over the entire wavelength range and detector and cooling options to match your sensitivity needs.
  • High resolution in compact designs enabled by high grating dispersion.

  • Detect all vibrational modes no matter the polarization, since our gratings provide even diffraction efficiency in both TM and TE polarization over the entire range.
  • Anti-Stokes can be detected, improving the ability to distinguish Raman signals from the fluorescence background. The figure shows an example of L-cystine measured with our EAGLE Raman-S.
  • Environmentally stable designs, that perform under any condition.

  • Spectrometer customization to match your exact requirements.

  • Worry-free volume scaling thanks to design for manufacture and low unit-to-unit variance.

  • Low unit-to-unit variation from our optimized manufacturing process and thorough testing of every produced unit.

  • Access to in-house experts who work with you to optimize your Raman system performance.

L-cystine measured with a EAGLE Raman-S configured for anti-Stokes

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.

  • High diffraction efficiency over a broad wavelength range for optimal sensitivity at any wavenumber.

  • Polarization independent across the entire wavelength range, optimal for detecting all vibrational modes of a molecule.

  • High dispersion enables more compact spectrometer designs.

Absolute diffraction efficiency of transmission gratings for Raman

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.

Wavelength ranges: 532 nm | 632 nm | 785 nm | 830 nm

Relative sensitivity of our spectrometers for Raman
Photon generated electrons - Raman-HR and FREEDOM Mini-Raman

More resources

Video: Raman spectroscopy
for advanced applications

Raman shift calculator

Raman instrumentation

Technical notes
and white papers

Handheld Raman spectrometers

Other resources by category

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