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The number of layers shown in this schematic is not indicative of the number of layers in an actual bandpass filter. These glass layers are necessary to protect the dielectric coating from the atmosphere exposure would significantly reduce the filter's transmission efficiency over time.įor applications with demanding wavefront requirements, such as imaging, please consider our premium edgepass filters. We do not recommend removing the filter from its mount, as the filter consists of several layers of glass that are held together with epoxy and the mounting ring. As the mounts are not threaded, Ø1" retaining rings will be required to mount the filters in one of our internally-threaded SM1 lens tubes. These filters can be mounted in our extensive line of filter mounts and wheels. The ring makes handling easier and enhances the blocking OD by limiting scattering. Please see our premium hard-coated edgepass filters for use in fluorescence applications.Ĭlicking on this symbol in the tables below will open a window showing transmission and optical density data for the corresponding filter.Įach filter is housed in a black anodized aluminum ring that is labeled with an arrow indicating the design propagation direction. Please note: The edgepass filters on this page are not tested or recommended for fluorescence applications. In addition, our edgepass filters are hermetically sealed to provide maximum humidity protection, and they can be stacked to create a custom bandpass filter. This feature can be useful in applications where it is desirable to fine tune the location of the cut-on, or cut-off wavelength. As a rule of thumb, when the angle of incidence goes from 0° to 45°, the central wavlength shifts down by about 10%. Unlike colored filter glass, the cut-on and cut-off wavelength of these filters will shift to a shorter wavelength as the angle of incidence is increased. Their film construction is essentially a modified quarter-wave stack, using interference effects rather than absorption, to isolate their spectral bands (see the Specs tab for transmission information). These edgepass filters feature durable dielectric coatings that withstand the normal cleaning and handling necessary when using any high-quality optical component. Thorlabs' longpass and shortpass filters are very useful for isolating regions of a spectrum. Stray Light or Trim Filters to Eliminate any Unwanted Near-Band Radiation.1" Outer Diameter (Ø21.0 mm Clear Aperture).
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