FELH0900 Dia:25.0 mm Premium Longpass Filter; Cut-On Wavelength: 900nm

The FELH0900 is a high-quality longpass filter, manufactured by Thorlabs, a leading vendor in the optical industry. This filter is designed with a circular shape, featuring a diameter of 25.0 mm and a thickness of 3.5 mm, making it suitable for a wide range of optical applications.

The filter's primary function is to allow the transmission of light with wavelengths greater than or equal to 900nm, while blocking or significantly reducing the transmission of shorter wavelengths. This is achieved through the application of a specialized coating, denoted as 'tho felh0900' on both the front and back surfaces of the filter. The 'tho felh0900' coating ensures a sharp cut-on at the specified wavelength, enhancing the filter's performance and reliability.

The FELH0900 is categorized as a premium filter, implying that it has been fabricated using superior materials and manufacturing processes. This results in improved optical performance, increased durability, and better overall value for the user.

The filter's physical data indicates that it has a cut-on wavelength of 900nm and a cut-off wavelength of 0nm. This means that it will block all wavelengths of light below 900nm, making it ideal for applications where longpass filtering is required.