Product Types

Edge Pass Filters - Spectroscopy

Optical edge pass filters (EPF) are needed to isolate transmitted wavelengths from blocked wavelengths often in a sharp transition. This allows intelligent light instruments such as spectroscopes to identify and effectively separate the excitation wavelength from emitted wavelengths without interfering with the wavelengths of interest.

Our EPF product line includes both short pass filters (SPF) and long pass filters (LPF) for a range of wavelengths (UV, visible and NIR – 400 to 2200nm) and for various angles of incidence (AOI). Extra wide wavelength blocking is also available for Iridian EPFs.

Steep, high-blocking edge filters eliminate the need for multiple filters for spectral noise reduction.  All filters use hard dielectric coatings and do not require cover glass for durability.  This greatly improves the transmission levels in all our filters compared to traditional filters.

Iridian manufactures high performance EPFs that have been described as the best in the world by some of our customers. We are particularly adept at manufacturing edge pass filters with a very sharp transition between the reflect and pass bands while still maintaining very low insertion loss and pass band ripple. Low ripple in the pass band makes these filters suitable to meet the demanding specifications of spectroscopy instruments and telecom environments.

Edge Pass Filters - Spectroscopy

Custom Edge Pass Filters - Spectroscopy
In addition to the standard Edge Pass Filters - Spectroscopy above, Iridian can custom-manufacture these filters to your specifications. For more information, please complete this Custom Filter Request for Quotation form.