685BP20 24.4 mm Dia. Surface Coating; Bandpass Filter Surface Coating

The 685BP20 is a Bandpass Filter, part of the extensive catalog of optical elements offered by Omega Optical. This particular filter, with a catalog number 4090, is characterized by its circular shape and a diameter of 24.4 mm. The filter's thickness is 2 mm, making it a relatively thin lens.

The 685BP20 filter is designed to allow light transmission in a specific wavelength range, blocking other wavelengths. The central wavelength (CWL) of this filter is 685 nm, with a cut-on wavelength of 675 nm and a cut-off wavelength of 695 nm. This means that it will pass light most efficiently at 685 nm, while significantly attenuating light at wavelengths below 675 nm and above 695 nm.

The filter's coating is a crucial aspect of its functionality. Both the front and back surfaces of the 685BP20 filter are coated with "ome 685bp20", a surface coating specifically designed for this filter. This coating enhances the filter's performance, ensuring efficient light transmission within the desired wavelength range and effective blocking of unwanted wavelengths.

In terms of availability, the 685BP20 filter is currently in stock, and more information about it, including purchasing options, can be found on the Omega Optical website using the provided weblink.