Filter Types for Raman Spectroscopy Applications – Raman spectroscopy, an intense laser beam is used to excite a sample and the Raman “finger print” is measured by a dispersive or Fourier Transform spectrometer. Optical filters are used to prevent the undesired light from reaching the spectrometer and drowning out the relatively weak Raman signal.
Transition Width & Edge Steepness – Transition width and edge steepness are two terms often used to describe the spectral properties of edge filters and it is important to know that these two terms are related, but not interchangeable.
Ultraviolet (UV) Raman Spectroscopy – Measuring Raman spectra in the ultraviolet (UV) wavelength range has significant benefits over traditional Raman measurements performed with green, red, or near-infrared (IR) lasers.
Laser Damage Threshold – Laser damage to optical filters is strongly dependent on many factors, including laser type, power and beam diameter.
Group Delay Dispersion (GDD) for Reflected Laser Light – Pulse broadening is caused by dispersion associated with the optics used to direct and focus the laser light onto the sample, including mirrors, lenses, and beamsplitters. It is always desirable to keep the dispersion of these components to a minimum.