Skip navigation

New low wavenumber performance

Eclipse filters make low wavenumber analysis fast and easy

8 March 2013

Study low wavenumber Raman features quickly and easily with Renishaw's Eclipse filters for the inVia Raman microscope; block the laser, not Raman bands.

Most materials can be successfully analysed by studying the Raman bands in the 'fingerprint' region (200 cm-1 to 1800 cm-1). However, Raman analysis at much lower Raman shifts (below 200 cm-1) can reveal very valuable information for vibrations such as:

  • shear modesStokes/anti-Stokes Raman bands of L-cystine
  • lattice modes
  • acoustic modes
  • breathing modes 
  • folding modes
  • rotational modes
  • heavy atom vibrations

Eclipse performance

Eclipse filters make low wavenumber Raman analysis easy:

  • performance down to 5 cm-1 (typical - excitation specific)
  • high signal levels because of high transmission efficiency for Raman-scattered light
  • low noise levels from strong blocking of the Rayleigh-scattered light
  • suitable for photoluminescence measurements, in addition to Raman measurements (broad bandpass)
  • study both Stokes and anti-Stokes scattering; notch, rather than edge filter technology
  • longevity; robust glass-based filter technology
  • trouble-free use, from highly stable Renishaw mechanical mounts
  • easy switching between filters with Renishaw's encoded multi-filter motorised mount

For more information about Eclipse—and other Renishaw filters—contact a local sales representative or visit

Image: Stokes/anti-Stokes Raman bands of L-cystine (a standard sample for testing low wavenumber performance), showing bands at both 9 cm-1 and 15 cm-1.



News updates

Register for regular news updates from Renishaw