85-899 25 mm Dia. Hard Coated OD 4.0 50nm Bandpass Filter; t=3.5 mm 1350nm

The 85-899 is a Bandpass Filter with a diameter of 25 mm, sourced from the renowned optical components vendor, Edmund Optics. This filter is specifically designed for a central wavelength (CWL) of 1350nm, making it an ideal choice for applications that require precise filtering within this spectral range.

The filter is hard coated with a clear aperture of 25 mm and an outer diameter (OD) of 4.0. It has a thickness of 3.5 mm, providing excellent durability and stability. The hard coating enhances the filter's resistance to wear and tear, ensuring longevity and reliable performance even under demanding conditions.

The 85-899 features a cut-on wavelength of 1325nm and a cut-off wavelength of 1375nm. This means it allows transmission of light within the 1325-1375nm range while blocking light outside this range. This characteristic is crucial in applications where specific wavelengths need to be isolated or emphasized.

The filter's coating is another notable feature. Both the front and back surfaces are coated with EDM 85-887, a proprietary coating developed by Edmund Optics. This coating enhances the filter's performance by reducing unwanted reflections and increasing transmission efficiency.

In terms of geometry, the filter is shaped as a thin lens, which is beneficial in applications where compactness and minimal optical aberrations are required. The filter's physical data, including its catalog number, weblinks, and vendor, are all provided, making it easy for users to access additional information or place an order.