565DF20 10.5 mm Dia. Protected Coating; Bandpass Filter Protected Coating

The 565DF20 is a Bandpass Filter, a type of optical element that allows light within a specific wavelength range to pass through while blocking other wavelengths. This particular filter, sourced from Omega Optical, has a catalog number of 565DF20 and is available for purchase on their website.

The filter has a circular shape with a diameter of 10.5 mm and a thickness of 3 mm, making it suitable for a wide range of optical applications. It is made from UVFS MAL-1965, a material known for its optical properties.

The 565DF20 has a center wavelength (CWL) of 565 nm, which is the wavelength at which the filter has its maximum transmittance. The filter's cut-on wavelength is 555 nm, and the cut-off wavelength is 575 nm. This means that the filter starts to transmit light at 555 nm and stops transmitting at 575 nm, effectively passing light in the 555-575 nm range.

The filter features a protected coating on both the front and back surfaces. This coating enhances the filter's durability and performance, providing additional protection against environmental factors and potential damage during handling or use.

The filter's shape is described as a Thin Lens, indicating that it has been designed to focus light. This could be useful in applications where light needs to be concentrated onto a specific point or area.