390FCS2500 25 mm Dia. Colour Glass Bandpass Filter 390nm

The 390FCS2500 is a 25 mm diameter Color Glass Bandpass Filter, specifically designed to pass light in the 390nm wavelength range while blocking light at other wavelengths. This filter is sourced from Knight Optical, a reputable vendor known for their high-quality optical components.

The filter is made from UVFS Mal-1965 material, a unique glass composition that offers excellent optical performance in the ultraviolet region. It has a base shape of a circle, with a diameter of 25mm and a thickness of 3mm, making it suitable for a wide range of optical applications.

The 390FCS2500 features a cut-on wavelength of 335nm and a cut-off wavelength of 445nm. This means it begins to transmit light at 335nm and stops transmitting at 445nm, providing a narrow band of transmission centered around 390nm. This characteristic makes it ideal for applications that require precise wavelength selection.

The filter is coated on both sides with KNI 390FCS, a proprietary coating developed by Knight Optical. This coating enhances the filter's performance by reducing surface reflections and improving transmission in the passband. The coating also provides environmental protection, ensuring the filter maintains its performance over time.

In terms of geometry, the filter is shaped as a thin lens, which can be beneficial in applications where minimal optical path length distortion is required. The filter is currently in stock and available for immediate shipping, as indicated by its valid weblink status.

For more information about this filter, including pricing and availability, please refer to the provided weblink.