Optical Filters

Optical filter is usually a component with a wavelength-dependent transmittance or reflectance. It's used to selectively transmit or reject a wavelength or range of wavelengths.  Filters with particularly weak wavelength dependence of the transmittance are called neutral density filters. The general applications of optical filters include fluorescence microscopy, spectroscopy, clinical chemistry, machine vision inspection, etc.

Bandpass interference filters are designed to transmit a portion of the spectrum, while rejecting all other wavelengths. Notch filters reject a portion of the spectrum, while transmitting all other wavelengths. Edge or dichroic filters transmit wavelengths that are either greater than the cut-on or shorter than the cut-off wavelengths. Color substrate filters utilize the material’s inherent adsorption and transmission properties, while neutral density filters evenly reduce transmission across a portion of the spectrum. 

WISOPTIC's optical filters include mass collection of  dielectric-coated filters, colored glass filters, neutral density filters, spatial filters, and tunable optical filter based on liquid crystal technology. Specifically speaking, e.g. crystalline material UV band pass filters, neutral density reflective type filters made from Corning 7059 glass and designed to operate at 400-2000 nm range, neutral density absorption type filters designed to operate at VIS (450-650 nm) and Schott color glass filters. Highly durable hard coatings are available for applications that require high optical densities with maximum performance.

WISOPTIC Specifications - Optical Filters