Materion Barr Precision Optics & Thin Film Coatings designs and manufactures both edge-type and bandpass-type variable filters to customer specifications. The key feature of these devices is that spectral properties vary with position in a prescribed way along the lengthwise direction of the filter. It is possible to design this variation to be linear or non-linear, depending upon customer requirements. When the variation is linear the filter is known as a Linear Variable Filter (LVF). Materion Barr Precision Optics & Thin Film Coatings has capabilities to manufacture variable filters within the spectral range from approximately 300nm in the ultraviolet to the Near Infrared.

Customized solutions provide flexible options for our customers. That is why we offer bandpass filters at full width half maximum (FWHM) bandwidth, including options from wideband to ultra-narrowband.

For applications requiring an Ultra-Narrow Bandwidth, we can produce bandpass filters for use in the ultraviolet, visible and infrared spectral regions. A bandwidth (FWHM) of one to several angstroms in the visible spectral region is considered “ultra-narrow;” however, there is no strict definition of what constitutes an ultra-narrow bandwidth value for a bandpass filter.

Order Sorting Filters (OSF’s) from Materion Barr Precision Optics & Thin Film Coatings made with interference filter coatings can be provided in several different forms; as a coated substrate, as a patterned filter, or as a linear variable filter. Depending upon customer requirements Longpass filter coatings, Bandpass filter coatings, and sometimes Shortpass filter coatings can be used in the design of OSF’s. Filter coatings are designed to provide high transmission over the spectral region(s) selected for detection in the customer’s grating-based system and to provide effective rejection over the wavelength ranges where the undesired diffraction orders exist.

Barr Custom Steep Edge Filters are designed for laser applications where deep attenuation of laser radiation is required with sharp cut-on slope so as to afford high transmission very close to the laser line. Filters of this type are typically used in Raman Spectroscopy where the Rayleigh line must be effectively suppressed while transmitting Raman scattering separated as closely as 100 cm^-1 from it. Barr Steep Edge Filters can be designed for use in the UV, Visible, and NIR spectral regions and are manufactured with refractory oxide coatings which show robust environmental durability characteristics.

Materion Barr Precision Optics & Thin Film Coatings offers bandpass filters with bandwidth at Full Width Half Maximum (FWHM) selectable from Wideband to Ultra-Narrowband, manufactured to customer requirements. Where the requirement is for bandpass filters with Ultra-Narrow Bandwidth, Materion can produce such filters for use in the ultraviolet, visible, and infrared spectral regions. While there is no strict definition of just what bandwidth value constitutes “Ultra-Narrow” for a bandpass filter, a bandwidth (FWHM) of one to several angstroms in the visible spectral region, for example, would be considered as “Ultra-Narrow”.