Filters

Filters

An optical filter is an optical component that is used to transmit or reflect a specific range of wavelengths or a specific proportion of the incident light. It can be identified as a colour. The transmission of the light is considered as absorbed or cut. They are also applied as an absorbtion of light, use to pass long wavelengths only (longpass), short wavelengths only (shortpass), or a band of wavelengths, blocking both longer and shorter wavelengths (bandpass). Some of the most current and prominent applications that use filters are flow cytometry, Raman spectroscopy, fluorescence microscopy, LiDAR, imaging, astronomy, and various laser applications.

  • Neutral Density Filters

    Description

    Neutral Density filters are used to decrease the intensity of light by a given amount. The manner in which this is accomplished can be by absorption or reflection.  An absorptive filter reduces stray light by absorbing the unwanted light, but the performance can be changed by changes in temperature and thickness and are best suited for low power or visible systems.  A reflective Neutral Density Filter reflects the unwanted intensity which then needs to be accounted for in the system optical design.

  • Neutral Density Variable Filters

    Description

    Variable Neutral Density Filters have a neutral density (optical density) which varies as a function of angle or a function of distance. A rotationally varying neutral density filter is useful in a rotary mount to change the neutral density value as a function of rotation angle.  A dimensionally varying neutral density filter has a neutral density which varies as a function of length and works well with a translation stage to vary the optical density.

  • Colored Glass Filters

    Description

    OptoSigma's broad selection of colored glass filters offer high transmission, high out of band blocking, no inherent polarization effects and can be enhanced with optical coatings, such as AR or thin film filters to create the needed performance.  Colored glass filters are used in many applications such as sensor systems or other applications needing wavelength blocking, color enhancement, heat blocking or color temperature conversion.

  • Dielectric Spectral Filters

    Description

    Dielectric Spectral Filters are thin film based filters which provide higher spectral performance than colored glass filters.  These filters are typically used in applications such as spectroscopy, microscopy, or where heat has to be blocked or transmitted or the illumination spectra has to be cleaned up.

  • Diffusers

    Description

    Optical diffusers are a special type of filter used for dispersing light in a more uniform, Lambertian distribution or a beam shaping diffuser can disperse in one direction and not the orthogonal direction. The basic diffuser is made with a ground glass finish to scatter the light in all directions for illumination or prevent imaging of a filament.  The Beam Shaping Diffuser is a high transmission diffuser and can achieve wide angle diffusion in a single direction.  Beam shaping diffusers are used in light panels and some laser marking systems to create a more uniform beam along a preferred axis.

  • Etalon

    Description


  • Filter Case

    Description

    OptoSigma's Filter Case is used to protect valuable optical filters from damage, but can also be used for other thin profile optics such as windows and polarizers.

  • Optical Wavelength Tuners

    Description

    Our optical wavelength tuners are used to tweak the center wavelength and bandwidth of a collimated light source with beam motion compensation from the tilted bandpass filters. Adjustment of the wavelength and bandwidth are independently adjustable to provide narrowband monochromatic light from a broadband source.

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