540FDN25 25 mm Dia. Bandblocking Dichroic Filter 540nm

The 540FDN25 is a Dichroic Filter, specifically designed for bandblocking, with a diameter of 25 mm. This filter is sourced from Knight Optical, a reputable vendor known for its high-quality optical elements. The filter is made of N-BK7 Schott, a popular optical glass due to its excellent homogeneity and low auto-fluorescence.

The filter's primary function is to block light in the 450-630 nm range while allowing light at the 540 nm wavelength to pass through. This is achieved through a precise coating on both the front and back surfaces, labeled as 'kni 540fdn-0'. The coating is designed to ensure high transmission at the desired wavelength and efficient blockage of unwanted wavelengths.

The filter has a thickness of 1.1 mm, which is considered thin in the context of optical elements. This thinness, combined with its circular shape, gives it a 'Thin Lens' geometry. The filter's diameter is 25 mm, making it suitable for use in various optical systems where a small, high-performance bandblocking filter is required.

According to the vendor's information, the filter is currently in stock and available for immediate purchase. The product's webpage provides more detailed specifications and purchasing options.