Raman Filters Set

A Raman filter set is a group of optical filters that work together in a Raman spectroscopy system. It typically includes a laser line (bandpass) filter, a notch or edge (long-pass) filter, and sometimes a beam splitter. These filters optimize the purity of the excitation light and the efficiency of Raman signal collection.

A standard Raman filter set typically includes:

• Laser line bandpass filter: Used in the excitation path. It allows only the target laser wavelength to pass through, filtering out unwanted stray light from the laser source.

• Notch filter (or alternatively a long-pass edge filter): Used in the collection path. It creates a deep and narrow blocking band at the laser wavelength while transmitting Raman-shifted signals.

• Beam splitter (optional): For microscope-based Raman setups.

Raman filter sets operate through staged optical filtering to efficiently extract the Raman signal. The laser light first passes through a laser line bandpass filter, purifying the beam to a single wavelength before it illuminates the sample. This produces both Rayleigh and Raman scattering. On the collection side, the notch or long-pass filter strongly blocks Rayleigh scattering at the laser wavelength while allowing Raman signals to pass. As a result, only the Raman signal reaches the detector (e.g., CCD or PMT), significantly improving the signal-to-noise ratio (SNR).

When selecting a Raman filter set, key factors to consider include the laser wavelength, desired Raman shift range, signal sensitivity, and the system configuration.

Yes, we offer fully customizable Raman filter sets. Options include wavelength tuning, bandwidth adjustment, custom sizes and shapes, as well as multi-band integrated filters such as dual-band or triple-band filters.