66-240 25 mm Dia. Hard Coated High Performance OD 4.0 Longpass Filter; t=3 mm 1050nm

The 66-240 is a high-performance longpass filter, boasting a 25 mm diameter and a thickness of 3 mm, sourced from the renowned optical vendor, Edmund Optics. This filter is designed to transmit light with wavelengths longer than 1050 nm, while effectively blocking shorter wavelengths, making it ideal for various applications requiring longpass filtration.

The filter is constructed from UVFS Mal-1965, a material specifically chosen for its optical properties and durability. It features a circular shape, a standard in optical systems due to its ease of alignment and integration. The filter's thin lens design ensures minimal optical aberrations, contributing to its high-performance characteristics.

The 66-240 filter is hard coated on both the front and back surfaces with EDM 66-232, a coating that enhances its durability and resistance to environmental factors, further extending its lifespan and reliability. This coating also facilitates easier cleaning and maintenance, reducing the risk of damage during handling.

The filter's physical data indicates a cut-on wavelength of 1050 nm, meaning it begins to transmit light at this wavelength and beyond. The cut-off wavelength is 0 nm, indicating that it blocks all wavelengths shorter than this. This specificity in wavelength transmission makes the 66-240 filter a valuable tool in various optical systems.