87-869 25 mm Dia. Hard Coated OD 4.0 50nm Bandpass Filter; t=3.5 mm 1475nm

The 87-869 is a Bandpass Filter, sourced from Edmund Optics, with a catalog number 87-869. This filter is specifically designed for use in optical systems requiring a narrow bandwidth transmission centered at 1475nm. The filter features a circular shape with a diameter of 25mm and a thickness of 3.5mm, making it compatible with a wide range of optical systems.

The 87-869 filter is constructed with a hard coating on both the front and back surfaces, providing enhanced durability and resistance to scratches and other forms of damage. The coating material is UVFS Mal- 1965, which is known for its excellent optical properties.

The filter's physical data includes a cut-on wavelength of 1450nm and a cut-off wavelength of 1500nm, with a center wavelength (CWL) of 1475nm. This narrow bandwidth transmission characteristic makes it ideal for applications requiring high spectral purity and rejection of out-of-band light.

The filter's coating is Edmund Optics' 87-856, which is a broadband anti-reflection coating designed to minimize reflection losses across the visible and near-infrared spectral regions. This coating ensures high transmission efficiency and reduces the risk of unwanted reflections within the optical system.