FELH1250 Dia:25.0 mm Premium Longpass Filter; Cut-On Wavelength: 1250nm

The FELH1250 is a premium longpass filter, part of the extensive catalog offered by Thorlabs. This filter, with a catalog number FELH1250, is specifically designed for applications requiring a cut-on wavelength of 1250nm. The filter's information is readily available online, with a valid and in-stock status, ensuring users of its immediate availability.

The FELH1250 is a circular filter, with a diameter of 25.0 mm and a thickness of 3.5 mm, making it suitable for various optical setups. The filter is made from UVFS MAL-1965, a material known for its optical properties and durability.

The physical data of the FELH1250 includes a cut-on wavelength of 1250nm, indicating that it allows transmission of wavelengths greater than 1250nm while blocking lower wavelengths. The cut-off wavelength is 0, meaning it does not specifically block any wavelengths below its cut-on point.

The filter's coating is consistent on both the front and back, with the front coating being THOR FELH01250 and the back coating also being THOR FELH01250. This coating ensures the filter's longevity and performance in its intended application.

The FELH1250 has a thin lens shape, making it compatible with various optical systems. Its specifications make it an ideal choice for applications requiring a longpass filter with a 1250nm cut-on wavelength.