440DIB12 12.5 mm Dia. Standard Interference Bandpass Filter 440nm

The 440DIB12 is a 12.5 mm diameter Standard Interference Bandpass Filter, specifically designed to transmit light at a central wavelength (CWL) of 440nm. Sourced from Knight Optical, a reputable vendor in the optical industry, this filter is a part of their extensive catalog, and it is currently in stock.

This filter is a Bandpass type, which means it allows a specific range of wavelengths to pass through while blocking others. In this case, the passband ranges from 435nm to 445nm, making it ideal for applications that require narrow-band light in the blue spectrum. The filter's base shape is circular, and it is made from UVFS Mal- 1965 material, which is known for its excellent optical properties in the ultraviolet and visible light regions.

The 440DIB12 has a thickness of 6.1mm and is coated with KNI 440DIB on both the front and back surfaces. This coating enhances the filter's performance by ensuring high transmission within the passband and high rejection outside of it. The filter's shape is thin lens, which suggests it may have some light focusing properties, although this would depend on the specific optical system it is used in.