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3. Cut-off filters for Raman spectroscopy

Raman spectroscopy is a method widely used for studying of vibrational, rotational and other low-frequency modes of the substance, based on the phenomenon of inelastic (Raman) scattering of monochromatic light.

In Raman spectroscopy, the studied useful signal is much weaker than the laser radiation scattered by the sample.

In this situation, Raman spectrometers must have a high spectral resolution and a high coefficient of suppression of unnecessary scattered light (from mirrors, gratings, walls, etc.).

LLL-t filters are an effective additional device that improves the quality of modern Raman spectrometers.

These filters have specific features:

  • Blocking at the operating wavelength of the laser λ0 is 5 orders.

  • Transition from the blocked laser line (OD≥5) to the high transmission zone (OD<0.5) stokes lines are minimal. The width of such a transition zone TW (Transition Width) doesn’t exceed 0.04×λ0.

Cut-off filters for Raman spectroscopy

Figure: 1. Measured transmittance the LLL-t 530 filter.

Measurements by spectrophotometer Shimadzu UV-3600.

Find more information about the spectral properties of LLL-t filters.

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